Puls Dimension Q-Series Manual 

DC/DC CONVERTER ƒ DC 600V Input ƒ Optimized for Intermediate DC-bus of Drive Systems ƒ Two Input Fuses for DC 600V included ƒ 95% Full Load and Excellent Partial Load Efficiencies ƒ Width only 65mm, Weight only 890g ƒ 25% BonusPower®, 600W for up to 4s ƒ Active Filtering of Input Transients ƒ Full Power Between -25°C and +60°C ƒ Extremely Low Input Inrush Current Surge ƒ Reverse Input Polarity Protection ƒ DC-OK Relay Contact ƒ Quick-connect Spring-clamp Terminals ƒ 3 Year Warranty 1/27 GENERAL DESCRIPTION Modern machines typically use maintenance-free AC- motors which are controlled by frequency converters or servo amplifiers. Such devices have an intermediate DC- bus where all individual drives are connected. The QTD20 DC/DC converter can be connected directly to the intermediate DC-bus. In case of a mains failure, the QTD20 utilizes the power from the DC-bus capacitors which are charged from the kinetic energy of the motor until the motor has come to a complete stop. The intermediate DC-bus is usually unfiltered and have high EMI noise so the QTD20 has a very robust input stage and an appropriate input filter included. Additionally, the QTD20 is UL 508 approved and is equipped with input fuses which are rated and tested for 600Vdc applications. SHORT-FORM DATA Output voltage DC 24V nominal Adjustment range 24 - 28V Output current 20 – 17.5A continuous 25 – 21.4A short term (4s) Output power 480W continuous 600W short term (4s) Output ripple < 100mVpp 20Hz to 20MHz Input voltage DC 600V -20%/+40% Input current 0.85A at 600Vdc Inrush current typ. 1.5A peak Efficiency 95.0% at 600Vdc Losses 25.5W at 600Vdc Temperature range -25°C to +70°C operational Derating 12W/°C +60 to +70°C Hold-up time typ. 22ms at 600Vdc Dimensions 65x124x127mm WxHxD Weight 890g / 1.96lb L1 L2 L3 PE f Motor PE + DC Load, Controller QTD+ - + - PE f Motor ORDER NUMBERS DC/DC converter QTD20.241 Accessory ZM1.WALL Wall mount bracket ZM14.SIDE Side mount bracket UF20.241 Buffer unit YR40.241 Redundancy module MARKINGS IND. CONT. EQ. UL 508 EMC, LVD Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany

INDEX Page Page 1. Intended Use .......................................................3 2. Installation Requirements...................................3 3. Input ....................................................................4 4. Input Inrush Current ...........................................5 5. Output .................................................................6 6. Hold-up Time.......................................................8 7. DC-OK Relay Contact ..........................................8 8. Efficiency and Power Losses................................9 9. Lifetime Expectancy and MTBF.........................10 10. Functional Diagram...........................................10 11. Terminals and Wiring........................................11 12. Front Side and User Elements...........................12 13. EMC....................................................................13 14. Environment......................................................14 15. Protection Features ...........................................15 16. Safety Features..................................................15 17. Dielectric Strength ............................................16 18. Approvals...........................................................16 19. Physical Dimensions and Weight......................17 20. Accessories ........................................................ 18 20.1. ZM1.WALL – Wall/Panel mounting..........18 20.2. ZM14.SIDE - Side Mounting Bracket........19 20.3. UF20.241 - Buffer module ........................20 20.4. YR40.241 - Redundancy Module..............20 21. Application Notes............................................. 21 21.1. Repetitive Pulse Loading..........................21 21.2. Peak Current Capability ...........................22 21.3. External Input Protection.........................22 21.4. Charging of Batteries ...............................23 21.5. Output Circuit Breakers............................24 21.6. Series Operation .......................................24 21.7. Parallel Use to Increase Output Power....25 21.8. Parallel Use for Redundancy ....................25 21.9. Inductive and Capacitive Loads................25 21.10. Back-feeding Loads ..................................26 21.11. Use in a Tightly Sealed Enclosure ............26 21.12. Mounting Orientations ............................27 The information given in this document is correct to the best of our knowledge and experience at the time of publication. If not expressly agreed otherwise, this information does not represent a warranty in the legal sense of the word. As the state of our knowledge and experience is constantly changing, the information in this data sheet is subject to revision. We therefore kindly ask you to always use the latest issue of this document (available under www.pulspower.com). No part of this document may be reproduced or utilized in any form without our prior permission in writing. Some parts of this unit are patent by PULS (US patent No 091662,063, Des. 424,529, …). TERMINOLOGY AND ABREVIATIONS PE and symbol PE is the abbreviation for Protective Earth and has the same meaning as the symbol . Earth, Ground This document uses the term “earth” which is the same as the U.S. term “ground”. T.B.D. To be defined, value or description will follow later. DC 600V A figure displayed with the AC or DC before the value represents a nominal voltage with standard tolerances included. E.g.: DC 12V describes a 12V battery disregarding whether it is full (13.7V) or flat (10V) 600Vdc A figure with the unit (Vac or Vdc) at the end is a momentary figure without any additional tolerances included. may A key word indicating flexibility of choice with no implied preference. shall A key word indicating a mandatory requirement. should A key word indicating flexibility of choice with a strongly preferred implementation. Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany 2/27

1. INTENDED USE This device is designed for installation in an enclosure and is intended for the general professional use in industrial equipment. Do not use this DC/DC converter in equipment, where malfunction may cause severe personal injury or threaten human life. 2. INSTALLATION REQUIREMENTS This device may only be installed and put into operation by qualified personnel. This device does not contain serviceable parts. The tripping of an internal fuse is caused by an internal defect. If damage or malfunction should occur during installation or operation, immediately turn power off and send unit to the factory for inspection. Mount the device on a DIN-rail so that the input terminals are located on the bottom of the unit. For other mounting orientations see de-rating requirements in this document. See chapter 21.12. This device is designed for convection cooling and does not require an external fan. Do not obstruct airflow and do not cover ventilation grid (e.g. cable conduits) by more than 15%! Keep the following installation clearances: 40mm on top, 20mm on the bottom, 5mm on the left and right sides are recommended when the device is loaded permanently with more than 50% of the rated power. Increase this clearance to 15mm in case the adjacent device is a heat source (e.g. another DC/DC converter). Caution: For use in a controlled environment according to CSA 22.2 No 107.1-01. WARNING Risk of electrical shock, fire, personal injury or death. - Do not use the DC/DC converter without proper grounding (Protective Earth). Use the terminal on the input block for earth connection and not one of the screws on the housing. - Turn power off before working on the device. Protect against inadvertent re-powering. - Make sure that the wiring is correct by following all local and national codes. - Do not modify or repair the unit. - Do not open the unit as high voltages are present inside. - Use caution to prevent any foreign objects from entering the housing. - Do not use in wet locations or in areas where moisture or condensation can be expected. - Do not touch during power-on, and immediately after power-off. Hot surfaces may cause burns. Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany 3/27

3. INPUT Input nom. DC 600V -20%/+40% Input range min. 480-840Vdc Continuous operation min. 360-480Vdc Maximal 60s or with reduced output current, see Fig. 5-2 min. 840V-900Vdc Maximal 60s or with reduced output current, see Fig. 5-2 max. 1000Vdc Absolute maximum input voltage with no damage to the DC/DC converter. Above 900Vdc, the output will switch off and will turn-on again, when the input voltage falls below 850Vdc. Allowed voltage input to Earth max. 600V R.M.S. Continuous, IEC 60664-1 max. ±900Vpk Peak value, allowed for transients Slew rate for voltages between input and Earth (ground) max. 1000V/μs Allowed input ripple voltage max. 50Vpp 50Hz-40kHz Turn-on voltage typ. 450Vdc Steady-state value, load independent, see Fig. 3-1 Shut-down voltage typ. 325Vdc Steady-state value, load independent, see Fig. 3-1 Input current typ. 0.79A At 24V, 20A, see Fig. 3-3 Start-up delay typ. 350ms See Fig. 3-2 Rise time typ. 70ms At 24V, 20A, only resistive load see Fig. 3-2 typ. 110ms At 24V, 20A, resistive load with an additional 20mF capacitor Turn-on overshoot max. 500mV See Fig. 3-2 External capacitors on input Allowed without any limitations Fig. 3-1 Input voltage range Turn-on 450Vdc VIN POUT 900Vdc Shut-down 840Vdc 325Vdc 480Vdc 360Vdc A: continuously allowed B: < 60s or with derating B A B Fig. 3-2 Turn-on behavior, definitions Fig. 3-3 Input current vs. output load at 24V Start-up delay Rise Time Overshoot - 5% Output Voltage Intput Voltage 20A 2 4 6 8 10 12 14 16 18 0 0.2 0.4 0.6 1.0A 0.8 Output Current Input Current, typ. Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany 4/27

4. INPUT INRUSH CURRENT The DC/DC converter is equipped with an active inrush current limitation circuit, which limits the input inrush current after turn-on and after short input voltage interruptions to a very low value. DC 600V Inrush current*) max. 3Apeak Over entire temperature range typ. 1.6Apeak Over entire temperature range Inrush energy max. 1A2s Over entire temperature range Inrush delay typ. 350ms *) The charging current into EMI suppression capacitors is disregarded in the first microseconds after switch-on. Fig. 4-1 Typical turn-on behavior at nominal load and 25°C ambient temperature Input Current Input Voltage Output Voltage Input: 600Vdc Output: 24V, 20A Ambient: 25°C Upper curve: Input voltage 100V/Div Medium curve: Output voltage 5V/DIV Lower curve: Input current 1A/DIV Time base: 100ms/DIV Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany 5/27

5. OUTPUT Output voltage nom. 24V Adjustment range min. 24-28V Guaranteed max. 30V 3) At clockwise end position of potentiometer Factory setting typ. 24.1V ±0.2%, at full load, cold unit Line regulation max. 10mV At 480-840Vdc voltage change Load regulation max. 100mV Static value, 0AÆ20A Ripple and noise voltage max. 100mVpp 20Hz to 20MHz, 50Ohm Output current – continuous nom. 20A 4) At 24V, input: 480-840Vdc, see Fig. 5-1 nom. 17.5A 4) At 28V, input: 480-840Vdc, see Fig. 5-1 Output current – up to 4s 1) nom. 25A At 24V, input: 480-840Vdc, see Fig. 5-1 and Fig. 5-3 nom. 21.4A At 28V, input: 480-840Vdc, see Fig. 5-1 and Fig. 5-3 Output power – continuous nom. 480W At 24-28V Output power – up to 4s 1) nom. 600W At 24-28V BonusPower® time typ. 4s Duration until the output voltage dips, see Fig. 5-3 BonusPower® recovery time typ. 7s Overload free time to reset power manager, see Fig. 5-4 Overload behavior cont. current See Fig. 5-1 Short-circuit current 2) min. 20A Continuous, load impedance 50mOhm, see Fig. 5-1 max. 23A Continuous, load impedance 50mOhm, see Fig. 5-1 min. 25A Short-term (4s), load impedance 50mOhm, see Fig. 5-1 max. 28A Short-term (4s), load impedance 50mOhm, see Fig. 5-1 Output capacitance typ. 950μF Included in the DC/DC converter 1) BonusPower®, short term power capability (up to typ. 4s) The DC/DC converter is designed to support loads with a higher short-term power requirement without damage or shutdown. The short-term duration is hardware controlled by an output power manager. This BonusPower® is repeatedly available. Detailed information can be found in chapter 21.1. If the DC/DC converter is loaded longer with the BonusPower® than shown in the bonus- time diagram (see Fig. 5-3), the max. output power is automatically reduced to 480W. 2) Discharge current of output capacitors is not included. 3) This is the maximum output voltage which can occur at the clockwise end position of the potentiometer due to tolerances. It is not guaranteed value which can be achieved. The typical value is about 28.5V. 4) Reduce output current according to Fig. 5-2 for the extended input voltage ranges from 360-480Vdc and 840-900Vdc. Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany 6/27

Fig. 5-1 Output voltage vs. output current, typ. Fig. 5-2 Output current vs. input voltage Output Voltage 0 0 5 10 20 25 4 8 12 28V 16 20 24 15 30A Output Current short-term Adjustment Range continuous Allowed Output Current at 24V 0 900 Vdc 5 10 15 20 25A continuous for typ. 4s 840 Vdc 360 Vdc 480 Vdc Input Voltage <60s <60s Fig. 5-3 Bonus time vs. output power Fig. 5-4 BonusPower® recovery time max. Bonus Time 0 105 110 115 120 125 130% Output Power 1 2 3 4 5s min. Power Demand Output Voltage Limitation by Power Manager Bonus Power disabled Recovery Time 100% <125% Bonus Time The BonusPower® is available as soon as power comes on and after the end of an output short circuit or output overload. Fig. 5-5 BonusPower® after input turn-on Fig. 5-6 BonusPower® after output short 100% Output Voltage Intput Voltage Bonus Power Output Power 125% Short of Output 100% Output Voltage Bonus Power Output Power 125% Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany 7/27

6. HOLD-UP TIME DC 600V Hold-up Time typ. 44ms At 24V, 10A, see Fig. 6-1 min. 36ms At 24V, 10A, see Fig. 6-1 typ. 22ms At 24V, 20A, see Fig. 6-1 min. 18ms At 24V, 20A, see Fig. 6-1 Fig. 6-1 Hold-up time vs. input voltage Fig. 6-2 Shut-down behavior, definitions 0 10 20 30 40 50ms 400 500 600 700 800Vdc Input Voltage Hold-up Time 24V, 10A, typ. 24V, 20A, typ. 24V, 10A, min. 24V, 20A, min. - 5% Hold-up Time Output Voltage Intput Voltage 7. DC-OK RELAY CONTACT This feature monitors the output voltage, which is produced by the DC/DC converter itself. It is independent of a back- fed voltage from a unit connected in parallel to the DC/DC converter output. Contact closes As soon as the output voltage reaches the adjusted output voltage. Contact opens As soon as the output voltage dips more than 10% below the adjusted output voltage. Short dips will be extended to a signal length of 250ms. Dips shorter than 1ms will be ignored. Contact re-closes As soon as the output voltage exceeds 90% of the adjusted voltage. Contact ratings max. 60Vdc 0.3A, 30Vdc 1A, 30Vac 0.5A Resistive load min. 1mA at 5Vdc Min. permissible load Isolation voltage See dielectric strength table in section 17. Fig. 7-1 DC-ok relay contact behavior 250ms 0.9* VADJ < 1ms 10% open VOUT = VADJ open closed closed > 1ms Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany 8/27

8. EFFICIENCY AND POWER LOSSES DC 600V Efficiency typ. 95.0% At 24V, 20A Average efficiency*) typ. 94.4% 25% at 5A, 25% at 10A, 25% at 15A and 25% at 20A Power losses typ. 7.7W At 24V, 0A (no load) typ. 12.8W At 24V, 10A (half load) typ. 25.5W At 24V, 20A (full load) *) The average efficiency is an assumption for a typical application where the DC/DC converter is loaded with 25% of the nominal load for 25% of the time, 50% of the nominal load for another 25% of the time, 75% of the nominal load for another 25% of the time and with 100% of the nominal load for the rest of the time. Fig. 8-1 Efficiency vs. output current at 24V, typ. Fig. 8-2 Losses vs. output current at 24V, typ. Efficiency 4 6 8 10 12 14 16 18 20A 88 89 90 91 92 93 94 95 96% Output Current Power Losses 0 2 4 6 8 10 12 14 20A 0 5 10 15 20 25 30W 16 18 Output Current Fig. 8-3 Efficiency vs. input voltage at 24V, 20A, typ. Fig. 8-4 Losses vs. input voltage at 24V, 20A, typ. Efficiency 350 450 650 750 850Vdc 92.5 93.0 93.5 94.0 94.5 95.0 95.5% Input Voltage 550 Power Losses 350 450 550 650 850Vdc 23.0 25.0 27.0 29.0 31.0 33.0 35W 750 Input Voltage Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany 9/27

9. LIFETIME EXPECTANCY AND MTBF DC 600V Calculated lifetime expectancy*) 220 000h *) At 24V, 10A and 25°C 78 000h At 24V, 10A and 40°C 119 000h At 24V, 20A and 25°C 42 000h At 24V, 20A and 40°C MTBF**) SN 29500, IEC 61709 801 000h At 24V, 20A and 25°C 446 000h At 24V, 20A and 40°C MTBF**) MIL HDBK 217F 267 000h At 24V, 20A and 25°C; Ground Benign GB25 204 000h At 24V, 20A and 40°C; Ground Benign GB40 *) The calculated lifetime expectancy shown in the table indicates the minimum operating hours (service life) and is determined by the lifetime expectancy of the built-in electrolytic capacitors. Lifetime expectancy is specified in operational hours and is calculated according to the capacitor’s manufacturer specification. The manufacturer of the electrolytic capacitors only guarantees a maximum life of up to 15 years (131 400h). Any number exceeding this value is a calculated theoretical lifetime which can be used to compare devices. **) MTBF stands for Mean Time Between Failure, which is calculated according to statistical device failures, and indicates reliability of a device. It is the statistical representation of the likelihood of a unit to fail and does not necessarily represent the life of a product. The MTBF figure is a statistical representation of the likelihood of a device to fail. A MTBF figure of e.g. 1 000 000h means that statistically one unit will fail every 100 hours if 10 000 units are installed in the field. However, it can not be determined if the failed unit has been running for 50 000h or only for 100h. 10. FUNCTIONAL DIAGRAM Fig. 10-1 Functional diagram + + - - VOUT DC ok Output Over- Voltage Protection Input Filter Inrush Current Limiter Transient Filter Input Fuses (in + and - pole) Output Voltage Regulator Power Converter Output Filter DC ok Relay Output Voltage Monitor Output Power Manager Temper- ature Shut- down Overload LED DC-OK LED + - Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany 10/27

11. TERMINALS AND WIRING The terminals are IP20 Finger safe constructed and suitable for field and factory wiring. Type Quick-connect spring-clamp terminals Solid wire Max. 6mm2 Stranded wire Max. 4mm2 American Wire Gauge Max. AWG10 Wire diameter Max. 2.8mm (including ferrules) Wire stripping length Typ. 10mm / 0.4inch Screwdriver Not applicable Recommended tightening torque Not applicable Instructions: a) Use appropriate copper cables that are designed for minimum operating temperatures of: 60°C for ambient up to 45°C and 75°C for ambient up to 60°C minimum 90°C for ambient up to 70°C minimum. b) Follow national installation codes and installation regulations! c) Ensure that all strands of a stranded wire enter the terminal connection! d) Do not use the unit without PE connection. e) Ferrules are allowed. 1. Insert the wire 2. Snap the lever To disconnect wire: same procedure vice versa Daisy chaining: Daisy chaining (jumping from one DC/DC converter output to the next) is allowed as long as the average output current through one terminal pin does not exceed 27A. If the current is higher, use a separate distribution terminal block as shown in Fig. 11-2. Fig. 11-1 Daisy chaining of outputs Fig. 11-2 Using distribution terminals Load + - DC/DC converter + + - - Output DC/DC converter + + - - Output max 27A continuous! Distribution Terminals Load + - DC/DC converter + + - - Output DC/DC converter + + - - Output Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany 11/27

12. FRONT SIDE AND USER ELEMENTS Fig. 12-1 Front side A Input Terminals (Quick-connect spring-clamp terminals) + Positive input – Negative (return) input ...PE (Protective Earth) input B Output Terminals (Quick-connect spring-clamp terminals, two pins per pole) + Positive output – Negative (return) output C Output Voltage Potentiometer Multi turn potentiometer; Open the flap to set the output voltage. Factory set: 24.1V at full output current D DC-OK LED (green) On, when the voltage on the output terminals is >90% of the adjusted output voltage. E Overload LED (red) - On, when the voltage on the output terminals is <90% of the adjusted output voltage, or in case of a short circuit in the output. - On, when the unit has switched off due to over-temperature. - Input voltage is always required F DC-OK Relay Contact (Quick-connect spring-clamp terminals) The DC-OK relay contact is synchronized with the DC-OK LED. See chapter 7 for details. Indicators, LEDs: Overload LED DC-OK LED DC-OK Contact Normal mode OFF ON Closed During BonusPower® OFF ON Closed Overload (Vout < 90%) ON OFF Open Output short circuit ON OFF Open Temperature Shut-down ON OFF Open No input power OFF OFF Open Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany 12/27

13. EMC The DC/DC converter is suitable for applications in industrial environment. EMC Immunity According to generic standards: EN 61000-6-2 and EN 61800-3 Electrostatic discharge EN 61000-4-2 Contact discharge Air discharge 8kV 15kV Criterion A Criterion A Electromagnetic RF field EN 61000-4-3 80MHz-2.7GHz 10V/m Criterion A Fast transients (Burst) EN 61000-4-4 Input lines Output lines DC-OK signal (coupling clamp) 4kV 2kV 2kV Criterion A Criterion A Criterion A Surge voltage on input EN 61000-4-5 (+) Æ (-) (+) / (-) Æ PE 1kV 4kV Criterion A Criterion A Surge voltage on output EN 61000-4-5 (+) Æ (-) (+) / (-)Æ PE 500V 1kV Criterion A Criterion A Surge voltage on DC-OK EN 61000-4-5 DC-OK signal Æ PE 1kV Criterion A Conducted disturbance EN 61000-4-6 0.15-80MHz 10V Criterion A Criterions: A: DC/DC converter shows normal operation behavior within the defined limits. EMC Emission According to generic standards: EN 61000-6-4 and EN 61800-3 Conducted emission input lines EN 55011, EN 55022, FCC Part 15, CISPR 11, CISPR 22 15dB higher than average limits for DC power port according to EN 61000-6-4*) Conducted emission output lines IEC/CISPR 16-1-2, IEC/CISPR 16-2-1 5dB higher than average limits for DC power port according to EN 61000-6-4*) Radiated emission EN 55011, EN 55022 Class A This device complies with FCC Part 15 rules. Operation is subjected to following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. *) There are no mandatory requirements in the generic standards EN 61000-6-4 and EN 61800-3 for conducted emissions on DC-Lines. For assessment of the conducted emissions, the input filter of the frequency converter or servo amplifier need to be taken into account. Switching Frequencies The DC/DC converter has three converters with three different switching frequencies included. One is nearly constant. The others are input voltage and load dependent. Switching frequency 1 100kHz Resonant converter, nearly constant Switching frequency 2 30kHz to 90kHz Boost converter, load dependent Switching frequency 3 17kHz to 120kHz Buck converter, input voltage and load dependent Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany 13/27

14. ENVIRONMENT Operational temperature*) -25°C to +70°C (-13°F to 158°F) Reduce output power according Fig. 14-1 Storage temperature -40 to +85°C (-40°F to 185°F) For storage and transportation Output de-rating 12W/°C 60-70°C (140°F to 158°F) Humidity**) 5 to 95% r.H. IEC 60068-2-30 Vibration sinusoidal 2-17.8Hz: ±1.6mm; 17.8-500Hz: 2g 2 hours / axis IEC 60068-2-6 Vibration random 0.5m²(s³) 2 hours / axis IEC 60068-2-64 Shock 30g 6ms, 20g 11ms 3 bumps / direction, 18 bumps in total IEC 60068-2-27 Altitude 0 to 2000m (0 to 6 560ft) Without any restrictions 2000 to 6000m (6 560 to 20 000ft) Reduce output power or ambient temperature, see Fig. 14-2 IEC 62103, EN 50178, overvoltage category II Altitude de-rating 30W/1000m or 5°C/1000m > 2000m (6500ft), see Fig. 14-2 Over-voltage category III IEC 62103, EN 62477-1, altitudes up to 2000m II For altitudes from 2000m to 6000m Degree of pollution 2 IEC 62103, EN 62477-1, not conductive LABS compatibility The unit does not release any silicone or other LABS-critical substances and is suitable for use in paint shops. *) Operational temperature is the same as the ambient or surrounding temperature and is defined as the air temperature 2cm below the unit. **) Do not energize while condensation is present. Fig. 14-1 Output current vs. ambient temp. Fig. 14-2 Output current vs. altitude Allowed Output Current at 24V 0 -25 0 20 40 70°C 5 10 15 20 25 30A continuous 60 Ambient Temperature for typ. 4s Allowed Output Current at 24V 0 0 2000 4000 6000m 5 10 15 20 25 30A continuous Altitude for typ. 4s A... Tamb < 60°C B... Tamb < 50°C C... Tamb < 40°C A B C Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany 14/27

15. PROTECTION FEATURES Output protection Electronically protected against overload, no-load and short-circuits*) Output over-voltage protection typ. 32Vdc max. 35Vdc In case of an internal DC/DC converter defect, a redundant circuit limits the maximum output voltage. The output shuts down and automatically attempts to restart. Reverse input polarity protection included Unit does not start when input voltage is reversed. Degree of protection IP 20 EN/IEC 60529 Penetration protection > 3.5mm E.g. screws, small parts Over-temperature protection yes Output shut-down with automatic restart Input transient protection MOV (Metal Oxide Varistor) Internal input fuse included The unit is equipped with two internal input fuses (+ line and - line) which protect the unit against internal short circuits and ground faults. The fuses are not user accessible. A tripping of an internal fuse is caused by an internal fault. *) In case of a protection event, audible noise may occur. 16. SAFETY FEATURES Input / output separation*) SELV EN 62477-1 PELV IEC/EN 60204-1, EN 62477-1, IEC 62103, IEC 60364-4-41 Class of protection I PE (Protective Earth) connection required Isolation resistance > 500MOhm Input to output, 500Vdc PE resistance < 0.1Ohm Touch current (leakage current) The leakage current, which is produced by the DC/DC converter itself, depends on the input voltage ripple and need to be investigated in the final application. For a smooth DC input voltage, the produced leakage current is less than 100μA. *) double or reinforced insulation Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany 15/27

17. DIELECTRIC STRENGTH The output voltage is floating and has no ohmic connection to the ground. Type and factory tests are conducted by the manufacturer. Field tests may be conducted in the field using the appropriate test equipment which applies the voltage with a slow ramp (2s up and 2s down). Connect all input poles together as well as all output poles before conducting the test. When testing, set the cut-off current settings to the value in the table below. Fig. 17-1 Dielectric strength A B C D Type test 60s 2500Vac 3000Vac 500Vac 500Vac Factory test 5s 2500Vac 2500Vac 500Vac 500Vac Field test 5s 2000Vac 2000Vac 500Vac 500Vac Cut-off current setting > 10mA > 10mA > 30mA > 1mA A D C B B*) + Input DC-ok Earth Output - + - To fulfil the PELV requirements according to EN 60204-1 § 6.4.1, we recommend that either the + pole, the – pole or any other part of the output circuit shall be connected to the protective earth system. This helps to avoid situations in which a load starts unexpectedly or can not be switched off when unnoticed earth faults occur. B*) When testing input to DC-OK ensure that the max. voltage between DC-OK and the output is not exceeded (column D). We recommend connecting DC-OK pins and the output pins together when performing the test. 18. APPROVALS EC Declaration of Conformity The CE mark indicates conformance with the - EMC directive and the - Low-voltage directive UL 508 IND. CONT. EQ. Listed for use as Industrial Control Equipment; U.S.A. (UL 508) and Canada (C22.2 No. 107-1-01); E-File: E198865 EAC TR Registration Registration for the Eurasian Customs Union market (Russia, Kazakhstan, Belarus) Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany 16/27

19. PHYSICAL DIMENSIONS AND WEIGHT Width 65mm 2.56’’ Height 124mm 4.88’’ Depth 127mm 5.0’’ The DIN-rail height must be added to the unit depth to calculate the total required installation depth. Weight 890g / 1.96lb DIN-Rail Use 35mm DIN-rails according to EN 60715 or EN 50022 with a height of 7.5 or 15mm. Housing material Body: Aluminium alloy Cover: zinc-plated steel Installation clearances See chapter 2 Fig. 19-1 Front view Fig. 19-2 Side view Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany 17/27

20. ACCESSORIES 20.1. ZM1.WALL – WALL/PANEL MOUNTING This bracket is used to mount the QTD20 DC/DC converter on a wall/panel without utilizing a DIN-Rail. The two aluminum brackets and the black plastic slider of the unit have to be detached, so that the steel brackets can be mounted. Fig. 20-1 Wall/panel mounting Fig. 20-2 Mounting Dimensions - Wall mounting bracket Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany 18/27

20.2. ZM14.SIDE - SIDE MOUNTING BRACKET This bracket is used to mount the QTD20 DC/DC converter sideways with or without utilizing a DIN-Rail. The two aluminum brackets and the black plastic slider of the unit have to be detached, so that the steel brackets can be mounted. For sideway DIN-rail mounting, the removed aluminum brackets and the black plastic slider need to be mounted on the steel bracket. Fig. 20-3 Side mounting without DIN- rail brackets Fig. 20-4 Side mounting with DIN-rail brackets Fig. 20-5 Mounting Dimensions Side mounting bracket Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany 19/27

20.3. UF20.241 - BUFFER MODULE This buffer unit is a supplementary device for DC 24V power supplies and DC/DC converter. It delivers power to bridge typical mains failures or extends the hold-up time after turn-off of the AC or DC power. In times when the DC/DC converter provides sufficient voltages, the buffer unit stores energy in the integrated electrolytic capacitors. In case of mains voltage fault, this energy is released again in a regulated process. The buffer unit does not require any control wiring. It can be added in parallel to the load circuit at any given point. Buffer units can be added in parallel to increase the output ampacity or the hold-up time. DC Buffer Unit(s) Power Supply Load AC + - 20.4. YR40.241 - REDUNDANCY MODULE The YR40.241 redundancy module is equipped with two input channels (20A each), which are individually decoupled by utilizing MOSFET technology. The output current can go as high as 40A. Using MOSFET instead of diodes reduces the heat generation and the voltage drop between input and output. The YR40.241 does not require an additional auxiliary voltage and is self-powered even in case of a short circuit across the output. Due to the low power losses, the unit is very slender and only requires 36mm width on the DIN-rail. Fig. 20-6 Typical 1+1 Redundant configuration for 20A with one dual redundancy module und two DC/DC converters Fig. 20-7 Typical N+1 Redundant configuration for 60A with two dual redundancy modules and four DC/DC converters + - PE 20A Load Failure Monitor PE + + - - QTD20.241 24V,20A DC- OK + - YR40.241 Redundancy Module Output Input 1 Input 2 + - + - + - PE + + - - QTD20.241 24V,20A DC- OK + - I I 60A Load Failure Monitor YR40.241 Redundancy Module Output Input 1 Input 2 + - + - + - YR40.241 Redundancy Module Output Input 1 Input 2 + - + - + - PE + + - - QTD20.241 24V,20A DC- OK + - PE + + - - QTD20.241 24V,20A DC- OK + - PE + + - - QTD20.241 24V,20A DC- OK + - PE + + - - QTD20.241 24V,20A DC- OK + - I I I + - PE I Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany 20/27

21. APPLICATION NOTES 21.1. REPETITIVE PULSE LOADING Typically, a load current is not constant and varies over time. This DC/DC converter is designed to support loads with a higher short-term power demand (=BonusPower®). The short-term duration is hardware controlled by an output power manager and is available on a repeated basis. If the BonusPower® load lasts longer than the hardware controller allows it, the output voltage will dip and the next BonusPower® is available after the BonusPower® recovery time (see chapter 5) has elapsed. To avoid this, the following rules must be met: a) The power demand of the pulse must be below 125% of the nominal output power. b) The duration of the pulse power must be shorter than the allowed BonusPower® time. (see output section) c) The average (R.M.S.) output current must be below the specified continuous output current. If the R.M.S. current is higher, the unit will respond with a thermal shut-down after a period of time. Use the maximum duty cycle curve (Fig. 21-2) to check if the average output current is below the nominal current. d) The duty cycle must be below 0.75. Fig. 21-1 Repetitive pulse loads, definitions Fig. 21-2 Max. duty cycle curve 100% PPEAK TPEAK P0 T0 max. 125% 125% 100 0 0.2 0.4 0.6 0.75 Duty Cycle 105 110 115 120 PPEAK P0 = 10% P0 = 50% P0 = 75% P0 = 100% P0 Base load (W) PPEAK Pulse load (above 100%) T0 Duration between pulses (s) TPEAK Pulse duration (s) DutyCycle T0 = Tpeak - (DutyCycle x Tpeak) Tpeak + T0 Tpeak DutyCycle = Example: A load is powered continuously with 240W (= 50% of the rated output load). From time to time a peak power of 600W (= 125% of the rated output load) is needed for 1 second. The question is: How often can this pulse be supplied without overloading the DC/DC converter? - Make a vertical line at PPEAK = 125% and a horizontal line where the vertical line crosses the P0 = 50% curve. Read the max. duty cycle from the duty cycle-axis (= 0.37) - Calculate the required pause (base load) length T0: 21/27 - Result: The required pause length = 1.7s - Max. repetition rate = pulse +pause length = 2.7s More examples for pulse load compatibility: PPEAK P0 TPEAK T0 PPEAK P0 TPEAK T0 600W 480W 1s >25s 600W 240W 0.1s >0.16s 600W 0W 1s >1.3s 600W 240W 1s >1.6s 540W 240W 1s > 0.75s 600W 240W 3s >4.9s DutyCycle T0= Tpeak - (DutyCycle x Tpeak) 0.37 1s - (0.37 x 1s) = =1.7s Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany

21.2. PEAK CURRENT CAPABILITY The DC/DC converter can deliver peak currents (up to several milliseconds) which are higher than the specified short term currents. This helps to start current demanding loads. Solenoids, contactors and pneumatic modules often have a steady state coil and a pick-up coil. The inrush current demand of the pick-up coil is several times higher than the steady-state current and usually exceeds the nominal output current (including the BonusPower®). The same situation applies when starting a capacitive load. The peak current capability also ensures the safe operation of subsequent circuit breakers of load circuits. The load branches are often individually protected with circuit breakers or fuses. In case of a short or an overload in one branch circuit, the fuse or circuit breaker need a certain amount of over-current to open in a timely manner. This avoids voltage loss in adjacent circuits. The extra current (peak current) is supplied by the power converter and the built-in large sized output capacitors of the DC/DC converter. The capacitors get discharged during such an event, which causes a voltage dip on the output. The following two examples show typical voltage dips: Fig. 21-3 Peak load with 2x the nominal current for 50ms, typ. Fig. 21-4 Peak load with 5x the nominal current for 5ms, typ. 10ms/DIV Output Voltage Output Current 24V 0A 40A 13V 1ms/DIV Output Voltage Output Current 24V 0A 100A 4V 40A Peak load (resistive) for 50ms Output voltage dips from 24V to 13V. 100A Peak load (resistive) for 5ms Output voltage dips from 24V to 4V. Please note: The DC-OK relay triggers when the voltage dips more than 10% for longer than 1ms. Peak current voltage dips typ. from 24V to 13V At 40A for 50ms, resistive load typ. from 24V to 4V At 80A for 2ms, resistive load typ. from 24V to 4V At 80A for 5ms, resistive load 21.3. EXTERNAL INPUT PROTECTION The unit is tested and approved for branch circuits up to 15A (U.S.A.) and 16A (IEC). An external protection is only required if the supplying branch has an ampacity greater than this. Check also local codes and local requirements. In some countries local regulations might apply. If an external fuse is necessary or utilized, minimum requirements need to be considered to avoid nuisance tripping of the circuit breaker. A minimum value of 6A B- or 3A C-Characteristic breaker should be chosen. Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany 22/27

21.4. CHARGING OF BATTERIES The DC/DC converter can be used to charge lead-acid or maintenance free batteries. (Two 12V batteries in series) Instructions for charging batteries: a) Set output voltage (measured at no load and at the battery end of the cable) very precisely to the end-of-charge voltage. End-of-charge voltage 27.8V 27.5V 27.15V 26.8V Battery temperature 10°C 20°C 30°C 40°C b) Use a 25A circuit breaker (or blocking diode) between the DC/DC converter and the battery. c) Ensure that the output current of the DC/DC converter is below the allowed charging current of the battery. d) Use only matched batteries when putting 12V types in series. e) The return current to the DC/DC converter (battery discharge current) is typ. 16mA when the DC/DC converter is switched off (except in case a blocking diode is utilized). Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany 23/27

21.5. OUTPUT CIRCUIT BREAKERS Standard miniature circuit breakers (MCB’s or UL1077 circuit breakers) are commonly used for AC-supply systems and may also be used on DC branches. MCB’s are designed to protect wires and circuits. If the ampere value and the characteristics of the MCB are adapted to the wire size that is used, the wiring is considered as thermally safe regardless of whether the MCB opens or not. To avoid voltage dips and under-voltage situations in adjacent 24V branches which are supplied by the same source, a fast (magnetic) tripping of the MCB is desired. A quick shutdown within 10ms is necessary corresponding roughly to the ride-through time of PLC's. This requires power supplies with high current reserves and large output capacitors. Furthermore, the impedance of the faulty branch must be sufficiently small in order for the current to actually flow. The best current reserve in the DC/DC converter does not help if Ohm’s law does not permit current flow. The following table has typical test results showing which B- and C-Characteristic MCBs magnetically trip depending on the wire cross section and wire length. Fig. 21-5 Test circuit Maximal wire length*) for a fast (magnetic) tripping: 0.75mm² 1.0mm² 1.5mm² 2.5mm² C-2A 31m 39m 59m 86m C-3A 24m 31m 43m 68m C-4A 15m 15m 32m 41m C-6A - - - - B-6A 16m 25m 34m 58m MCB Power Supply AC DC + - + - Load Wire length S1... Fault simulation switch S1 B-10A - - - - *) Don’t forget to consider twice the distance to the load (or cable length) when calculating the total wire length (+ and – wire). 21.6. SERIES OPERATION DC/DC converters of the same type can be connected in series for higher output voltages. It is possible to connect as many units in series as needed, providing the sum of the output voltage does not exceed 150Vdc. Voltages with a potential above 60Vdc are not SELV any more and can be dangerous. Such voltages must be installed with a protection against touching. Unit B - + Load + - Input Output - + Unit A Input Output Avoid return voltage (e.g. from a decelerating motor or battery) which is applied to the output terminals. Keep an installation clearance of 15mm (left / right) between two power supplies and avoid installing the power supplies on top of each other. Do not use power supplies in series in mounting orientations other than the standard mounting orientation (input terminals on the bottom of the unit). Pay attention that leakage current, EMI, inrush current, harmonics will increase when using multiple DC/DC converters. Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany 24/27

21.7. PARALLEL USE TO INCREASE OUTPUT POWER DC/DC converters and power supplies from the same series (Q-Series) can be paralleled to increase the output power. The output voltage shall be adjusted to the same value (±100mV) or the units can be left with the factory settings. 25/27 If more than three units are connected in parallel, a fuse or circuit breaker with a rating of 25A is required on each output. Alternatively, a diode or redundancy module can also be utilized. Keep an installation clearance of 15mm (left / right) between two power supplies and avoid installing the DC/DC converters or power supplies on top of each other. Do not use DC/DC converters or power supplies in parallel in mounting orientations other than the standard mounting orientation (input terminals on the bottom of the unit) or in any other condition where a derating of the output current is required (e.g. altitude, above 60°C, …). Unit B - + Load + - - + Unit A Input Output Input Output Pay attention that leakage current, EMI, inrush current, harmonics will increase when using multiple DC/DC converters. 21.8. PARALLEL USE FOR REDUNDANCY DC/DC converters can be paralleled for redundancy to gain higher system availability. Redundant systems require a certain amount of extra power to support the load in case one DC/DC converter unit fails. The simplest way is to connect two DC/DC converters in parallel. This is called a 1+1 redundancy. In case one DC/DC converter unit fails, the other one is automatically able to support the load current without any interruption. Redundant systems for a higher power demand are usually built in a N+1 method. E.g. five DC/DC converters, each rated for 20A are paralleled to build a 80A redundant system. For N+1 redundancy the same restrictions apply as for increasing the output power, see also chapter 21.7. Please note: This simple way to build a redundant system does not cover failures such as an internal short circuit in the secondary side of the DC/DC converter. In such a case, the defective unit becomes a load for the other power supplies and the output voltage can not be maintained any more. This can be avoided by utilizing redundancy modules, which have decoupling devices (diodes or MOSFETs) included. Further information and wiring configurations can be found in chapter 20.4. Recommendations for building redundant power systems: a) Use separate input fuses for each DC/DC converter. A separate source for each supply when possible increases the reliability of the redundant system. b) Monitor the individual DC/DC converter units. Therefore, use the DC-OK relay contact of the QTD20.241. c) It is desirable to set the output voltages of all units to the same value (± 100mV) or leave it at the factory setting. 21.9. INDUCTIVE AND CAPACITIVE LOADS The unit is designed to supply any kind of loads, including capacitive and inductive loads. Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany

21.10. BACK-FEEDING LOADS Loads such as decelerating motors and inductors can feed voltage back to the DC/DC converter. This feature is also called return voltage immunity or resistance against Back- E.M.F. (Electro Magnetic Force). This DC/DC converter is resistant and does not show malfunctioning when a load feeds back voltage to the DC/DC converter. It does not matter whether the DC/DC converter is on or off. The maximum allowed feed-back-voltage is 34Vdc. The absorbing energy can be calculated according to the built-in output capacitor which is specified in chapter 5. 21.11. USE IN A TIGHTLY SEALED ENCLOSURE When the DC/DC converter is installed in a tightly sealed enclosure, the temperature inside the enclosure will be higher than outside. In such situations, the inside temperature defines the ambient temperature for the DC/DC converter. The following measurement results can be used as a reference to estimate the temperature rise inside the enclosure. The DC/DC converter is placed in the middle of the box, no other heat producing items are inside the box Enclosure: Rittal Typ IP66 Box PK 9519 100, plastic, 180x180x165mm Load: 24V, 16A; (=80%) load is placed outside the box Input: 600Vdc Temperature inside enclosure: 54.9°C (in the middle of the right side of the DC/DC converter with a distance of 2cm) Temperature outside enclosure: 22.6°C Temperature rise: 32.6K Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany 26/27

Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany 21.12. MOUNTING ORIENTATIONS Mounting orientations other than all terminals on the bottom require a reduction in continuous output power or a limitation in the maximum allowed ambient temperature. The amount of reduction influences the lifetime expectancy of the DC/DC converter. Therefore, two different derating curves for continuous operation can be found below: Curve A1 Recommended output current. Curve A2 Max allowed output current (results in approximately half the lifetime expectancy of A1). Fig. 21-6 Mounting Orientation A (Standard orientation) DC/DC Converter OUTPUT INPUT Output Current 0 10 20 30 40 60°C 4 12 16 20A 50 A1 8 Ambient Temperature Fig. 21-7 Mounting Orientation B (Upside down) DC/DC Converter OUTPUT INPUT Output Current 0 10 20 30 40 60°C 4 12 16 20A 50 8 A1 A2 Ambient Temperature Fig. 21-8 Mounting Orientation C (Table-top mounting) Output Current 0 10 20 30 40 60°C 4 12 16 20A 50 8 A1 A2 Ambient Temperature Fig. 21-9 Mounting Orientation D (Horizontal cw) DC/DC Converter OUTPUT INPUT Output Current 0 10 20 30 40 60°C 4 12 16 20A 50 8 A1 A2 Ambient Temperature Fig. 21-10 Mounting Orientation E (Horizontal ccw) DC/DC Converter OUTPUT INPUT Output Current 0 10 20 30 40 60°C 4 12 16 20A 50 8 A1 A2 Ambient Temperature 27/27