Bender CMD420 Manual 

for monitoring of 3AC current with current transformer for overcurrent or undercurrent or in window mode for overcurrent and under current Software version CMD420: D287 V1.1x Software version CMD421: D294 V1.1x CMD42x_D00101_01_M_XXEN/10.2021 ...

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CMD42x_D00101_01_M_XXEN/10.2021 1. Important information ................................................................................................ 5 1.1 How to use this manual ................................................................................................. 5 1.2 Technical support: service and support .................................................................. 5 1.3 Training courses ............................................................................................................... 6 1.4 Delivery conditions, warranty and liability ............................................................. ...

5.1 Display elements in use .............................................................................................. 19 5.2 Function of the operating elements ...................................................................... 20 5.3 Menu structure .............................................................................................................. 21 5.4 Display in standard mode ........................................................................................ ...

1.1 How to use this manual Important notes and information are marked with the following symbols. 1.2 Technical support: service and support For commissioning and troubleshooting Bender offers you: First level support Technical support by phone or e-mail for all Bender products • Questions concerning specific customer applications • Commissioning • Troubleshooting Telephone: +49 6401 807-760* Fax: +49 6401 807-259 In Germany only: 0700BenderHelp (Tel. and Fax) E-mail: [email protected] This manual is intended for qualified personnel working in elec- trical engineering and elect ...

• Repairing, calibrating, testing and analysing Bender products • Hardware and software update for Bender devices • Delivery of replacement devices for faulty or incorrectly delivered devices • Extended warranty with in-house repair service or replacement device at no extra cost Telephone: +49 6401 807-780** (technical issues) +49 6401 807-784**, -785** (sales) Fax: +49 6401 807-789 E-mail: [email protected] Please send the devices for repair to the following address: Bender GmbH, Repair-Service, ...

The conditions of sale and delivery set out by Bender GmbH apply. For software products, the "Softwareklausel zur Überlassung von Standard-Software als Teil von Lieferungen, Ergänzung und Änderung der Allgemeinen Lieferbedingun- gen für Erzeugnisse und Leistungen der Elektroindustrie" (software clause in respect of the licensing of standard software as part of deliveries, modifications and changes to general delivery conditions for products and services in the electrical industry) set out by the ZVEI (Zentralverband Elektrotechnik- und Elektroni ...

your supplier if you are not sure how to dispose of the old equipment. The directive on waste electrical and electronic equipment (WEEE directive) and the directive on the restriction of certain hazardous substances in electrical and electronic equipment (RoHS directive) apply in the European Community. In Germany, these policies are implemented through the "Electrical and Electronic Equipment Act" (Ele- ktroG). According to this, the following applies: • Electric and electronic equipment are not ...

2.1 General safety instructions Part of the device documentation in addition to this manual is the enclosed "Safety instruc- tions for Bender products". 2.2 Work activities on electrical installations If the device is used outside the Federal Republic of Germany, the applicable local standards and regulations must be complied with. 2.3 Intended use The current monitoring device CMD420 resp. CMD421 monitors a three-phase system and also three different AC systems for undercurrent or overcurrent, and in window mode for undercurrent and overcurrent. For current measurement, three external standa ...

• Undercurrent and overcurrent monitoring in AC systems, current monitoring with window discriminator function • Current monitoring using standard current transformers: x/ 1A (CMD420), x/ 5A (CMD421) • Two separately adjustable alarm relays with one changeover contact each (K1, K2) • Fault memory behaviour for the alarm relays selectable • N/C or N/O operation selectable for K1, K2 • Digital measured value display via multi-functional LC display • LEDs: Power On (ON), Alarm 1 (AL1) and Alarm 2 (AL2) • Start-up delay, response delay and delay on release • Adjustable ...

dercurrent mode (Lo) or window mode (In) changes the meaning of the alarm LEDs AL1 and AL2: 3.2.2 Automatic self test The device automatically carries out a self test after connecting to the system to be moni- tored and later every 24 hours. During the self test internal functional faults will be detected and appear in form of an error code on the display. The alarm relays are not switched during this test. 3.2.3 Manual self test After pressing the test button for > 1.5 s, the device carries out a self test. During this t ...

Different alarm categories can be assigned to the alarm relays K1/K2 via the menu "out". 3.2.9 Delay times t, ton and toff The times t, ton and toff, described below, delay the output of alarms via LEDs and relays. Start-up delay t After connection to the supply voltage, the alarm indication is delayed by the preset time t (0…300 s). Response delay ton1/2 If the response value is exceeded or not reached, the current monitoring device requires the response time tan until an alarm is signalled. A set response delay ton1/2 (0…300 s) adds up to the devi ...

The transformation ratio for the current transformers has to be set as factor n in the menu "Set". The CMD420 requires current transformers with a transformation ratio of n = x/1A. The CMD421 requires current transformers with a transformation ratio of n = x/5A. The actual primary current can be calculated by multiplying the measured current by factor n and indicated on the display. In addition, the set factor n directly affects the minimum and maximum adjustable re- sponse value thresholds in the alarm menu. The factor is the multiplier of the nominal r ...

4.1 Installing the device Fig. 4.1: Dimension diagram and drawing for screw fixing Mounting on DIN rail: Snap the rear mounting clip of the device into place in such a way that a safe and tight fit is ensured. Screw fixing: Use the tool to move the rear mounting clips (a second. mounting clip is required, see or- dering information) to a position that it projects beyond the enclosure. Then fix the device using two M4 screws. Only qualified personnel are permitted to carry out the work nec- essary to install, commission and run a device or system. Risk of electrocution du ...

16 CMD42x_D00101_01_M_XXEN/10.2021 4.2 Connection of the device Connect the device according the wiring diagram. Us A1 ~/– ~/+ 6A 6A IT-System A2 k1 11 14 12 21 24 22 A2 A1 L1 N L2 L3 l3 k3 l1 k2 l2 k1 l1 k2 l2 k3 l3    Connect the conductor to the push- wire terminals according to the schematic diagram. Terminal Connections A1, A2 Connection to supply volt- age Us k1, l1 k2, l2 k3, l3 Connection to the conduc- tors to be monitored using current transformers 11, 12, 14 Alarm relay K1 21, 22, 24 Alarm relay K2 ...

17 CMD42x_D00101_01_M_XXEN/10.2021 4.3 Commissioning Checks must be carried out prior to commissioning to ensure that the current monitoring device has been connected correctly. Then perform a functional test. 4.4 Factory setting Incorrect connections can lead to personal injury and damage to equipment or property! The maximum permissible measuring current and the overload capability of the measuring inputs k, l have to be taken into con- sideration! CMD420 Response value overcurrent I1 (prewarning) Response value overcurrent I2 (alarm) CMD421 Response value overcurrent I1 (prewarning) Response value overcu ...

18 CMD42x_D00101_01_M_XXEN/10.2021 4.5 Maintenance A functional test is recommended to be carried out at regular intervals. It is preferable to check correct alarm indication by means of a current fault. Also check that the terminal connections are mechanically secure. One alarm relay of the CMD420 CMD421 must work in N/C opera- tion with the alarm category "Err" assigned to this relay, otherwise periodic inspection will be necessary! CAUTION ...

5.1 Operating elements Device front Element Mode ON Power On LED, green AL1 AL2 LED Alarm 1 lit up (yellow): Response value 1 reached LED Alarm 2 lit up (yellow): Response value 2 reached T Up button (< 1.5 s): Menu items/values Test button (> 1.5 s): to indicate the display elements in use, to start a self test; R Down button (< 1.5 s): Menu items/value Reset button (> 1.5 s): Deactivating the fault memory; MENU MENU button (> 1.5 s): To start the menu mode; Enter button (< 1.5 s): To confirm menu item, submenu item and value. Enter button (> 1.5 s): Move to the next higher menu level ...

20 CMD42x_D00101_01_M_XXEN/10.2021 5.2 Display elements in use Display elements in use Element Mode L1, L2, L3 Values of the measurement inputs k1/l1, k2/l2, k3/l3 RL Reload function with memory = off (L = I.) n Transformation ratio for external current transformer < I12 > I12 Undercurrent I1 or I2 Overcurrent I1 or I2 r1, 1 r2, 2 Alarm relay K1, Alarm relay K2 I Hys %, Hys Response value hysteresis in %; Hys in standard mode: Measured value in the hysteresis range according to alarm ton1, ton2, T, toff Response delay ton1 (K1), Response delay ton2 (K2) Start-up delay t Delay on release toff for K1, K2 M Fault memory active ...