Drucker Diagnostics 642VFD Service Manual

REV: A 1 200 Shadylane Drive Philipsburg, PA 16866 Phone: (814) 342-6205 Fax: (814) 342-4510 www.druckerdiagnostics.com Service Manual Model 642VFD Centrifuge

REV: A 2 CONTENTS 1 PREFACE ............................................................................................................................................ 3 2 GENERAL DESCRIPTION OF MAJOR COMPONENTS ......................................................................... 3 3 WARRANTY INFORMATION .............................................................................................................. 3 4 SPECIFICATIONS ................................................................................................................................ 3 5 TROUBLESHOOTING ......................................................................................................................... 4 6 SERVICE INSTRUCTIONS .................................................................................................................... 5 7 WIRING DIAGRAM .......................................................................................................................... 10 8 FINAL CENTRIFUGE ASSEMBLY ....................................................................................................... 11 9 CABINET ASSEMBLY ........................................................................................................................ 12 10 LOWER ASSEMBLY .......................................................................................................................... 13 11 MOTOR ASSEMBLY ......................................................................................................................... 14 12 REVISION HISTORY .......................................................................................................................... 15

REV: A 3 1 PREFACE 1.1 The purpose of this manual is to provide the service technician with information for troubleshooting, testing, and repair of laboratory centrifuge model 642VFD. Only qualified technically trained personnel should attempt any of the servicing described in this document. Failure to follow the procedures in this document may result in personal injury or instrument damage. The Drucker Company will not be held liable for any injury or damage as a result of improper servicing. 1.2 Information contained within this manual is subject to change without notice. 2 GENERAL DESCRIPTION OF MAJOR COMPONENTS 2.1 Motor: Permanent Split Capacitor AC Motor 2.2 Printed Circuit Board: The PCB is the microcontroller based control center of the centrifuge. All control signals are generated in the PCB. 2.3 Lid Locking Tray Assembly: The lid tray assembly contains a solenoid and limit switch that are used to determine the state of the lid (Open or Closed) and to keep the lid locked during centrifugation cycles. 2.4 Rotor: The centrifuge rotor is the main component that spins in the centrifuge. The rotor is loaded with tube holders, and the samples are placed into the tube holders for processing. 3 WARRANTY INFORMATION 3.1 The Drucker Company warrants its centrifuges to be free from defects in workmanship and parts for two years. 4 SPECIFICATIONS Maximum Speed 3800 RPM Maximum RCF 2000 xg Maximum Capacity 6 Tubes (17 x 100mm) Dimensions (in) 9.0 (H) x 11.0 (W) x 12.5 (L) Environmental Operating Range 2-40 deg C Typical Noise Level (At Maximum Speed) < 65 dB A Electrical Ratings 115VAC (+/- 10V)

REV: A 4 5 TROUBLESHOOTING PROBLEM POSSIBLE CAUSE SOLUTION The lid does not open. No Power Check line cord No Power Check circuit breaker on underside of centrifuge. No Power Check wall outlet Lid knob is ajar Rotate the lid knob fully clockwise before pressing the ‘OPEN’ button Lid lock is active (Unlock timed out) Press the ‘OPEN’ button to de-activate the lid Lid tray is unplugged from PCB or defective Requires service PCB is damaged Requires service To gain access to the rotor - Remove the ‘OPEN/CLOSE’ sticker and slide the lid latch lever toward the front of the centrifuge. This will unlock the lid. PROBLEM POSSIBLE CAUSE SOLUTION Excessive vibration Rotor improperly loaded Load equally filled tubes symmetrically in the rotor. All carriers and/or tube holders must be present in the rotor, whether loaded, or empty. Debris lodged within the rotor or tube carriers Carefully inspect all rotor pockets, tube holders and crevasses for debris. Centrifuge housing is loose Requires service Missing/damaged feet Requires service Motor failure Requires service Rotor damaged Replacement required PROBLEM POSSIBLE CAUSE SOLUTION Rotor does not spin No Power Check line cord No Power Check circuit breaker on underside of centrifuge. No Power Check wall outlet Lid not properly latched Press down firmly on lid and rotate lid knob clockwise until the ‘LATCHED’ light illuminates. Internal connection failure Requires service PCB failure Requires service Motor Failure Requires service PROBLEM POSSIBLE CAUSE SOLUTION Clicking noise during braking Rotor is loose Tighten rotor nut per section 7-2 PROBLEM POSSIBLE CAUSE SOLUTION Whistling noise while running Debris in air intake / exhaust ports Remove power before clearing debris. Gasket failure Requires service

REV: A 5 6 SERVICE INSTRUCTIONS 6.1 Cleaning a) The cabinet, rotor top and accessories shall be thoroughly cleaned using soap and water, isopropyl alcohol, or a mild bleach solution. b) Under no circumstances should any of the following be used: Fully/Partially Halogenated Hydrocarbons, Ketones and Esters. c) Use of any chemicals not prescribed by the manufacturer may cause damage to the rotor and tube carriers / holders and shall not be used. 6.2 Removing the Rotor a) Use a 1/2” nut driver to loosen the center rotor screw (turn counter-clockwise). b) Lift the rotor straight up and out of the rotor chamber. c) To install the rotor, reverse steps A and B above. d) Take care to align the hub spines with the rotor hub. e) Tighten the rotor nut by hand with a ½” nut driver until snug. A good rule of thumb is one full thread showing above the nut is a good indicator of proper installation. 6.3 Maintaining the Rotor a) Keep the rotor clean, any corrosive materials must not be allowed contact with the rotor and should be cleaned immediately. b) The rotor should be checked periodically for signs of wear. c) Remove the rotor from service if any of the following are found: cracks, deep scratches, corrosion or discoloring. 6.4 Rotor Nut a) If the rotor screw needs to be tightened, use a ½” nut driver and tighten it by hand until snug. b) Rule of thumb: One full thread showing above the nut is a good indicator of proper installation. 6.5 Speed Calibration a) Check the centrifuge speed periodically, we recommend every two years. b) Important: When verifying rotor speed, make certain that all tube holders are installed in the rotor. c) No calibration adjustment of speed can be made, only a verification of rotor speed. 6.6 Line Leakage a) Check the centrifuge’s line leakage periodically, we recommend every two years.

REV: A 6 b) All Drucker centrifuges currently manufactured are classified as “laboratory equipment”, per the requirements of UL 61010-1 Electrical Equipment for Measurement, Control and Laboratory Use; Part 1: General Requirements. This standard specifies that the maximum current levels between any accessible parts are as follows: c) In normal condition the maximum current flow between accessible parts is 0.5mA RMS for sinusoidal waveforms, 0.7mA peak for non-sinusoidal waveforms or mixed frequencies, or 2mA DC. d) In single fault condition the maximum current flow between accessible parts is 3.5mA RMS for sinusoidal waveforms, 5mA peak for non-sinusoidal waveforms or mixed frequencies, or 15mA DC. 6.7 Ground continuity a) Check the centrifuge’s ground continuity periodically, we recommend every two years. b) Disconnect the manufacturer’s supplied power cord from the power supply. c) Measure the resistance between the ground tab of the line cord and an exposed, clean, unpainted metal surface contiguous to the chassis main frame. d) The maximum acceptable ground resistance is 0.1 Ohms. 6.8 Removing the Cabinet (Upper Housing) a) There are six screws that fasten the centrifuge cabinet to the base. b) Begin by unplugging the centrifuge, and waiting 10 minutes for internal voltages to dissipate. c) Use a #2 Phillips screwdriver to remove the cabinet screws (two on left and right sides, two in the rear) d) The centrifuge control panel is attached to the base internally with cable harnesses. Be careful not to stress the cables when removing the cabinet. e) Stand directly in front of the centrifuge and lift the cabinet straight up and off the base, setting it down on its right side. f) Gently remove the combination power supply / motor harness from the PCB. 6.9 Replacing the Lid Tray Assembly a) The lid tray assembly is accessible once the cabinet has been removed. b) Gently remove the lid tray wire harness from the PCB. c) The lid tray assembly is held in place with two #6 Nylok nuts. Use a 5/16” nut driver to remove the nuts. The tray will slide off the threaded studs. d) Early models used a plastic spacer between the tray assembly and the metal cabinet. A spacer is no longer needed. IMPORTANT: Remove any plastic spacer that may be present.

REV: A 7 e) To install the lid tray, slide it onto the studs, and secure it with two #6 Nylok nuts, hand tight. f) Complete the installation by gently plugging the wire harness into the PCB header ‘J4’. The header and connector are keyed for proper orientation. 6.10 Replacing the PCB a) The PCB is accessible once the cabinet has been removed. Make certain that all wire harnesses have been disconnected. b) The PCB has capacitors that will remain charged for a period after the centrifuge is unplugged. Make certain to use standard precautions for handling potentially charged capacitors when working with the PCB. c) The PCB is held in place with four #6 Nylok nuts and plastic insulator washers. Use a 5/16” nut driver to remove the nuts. The PCB and washers are now free to slide off the threaded studs. d) Beneath the PCB are four plastic standoffs. If they are crushed, replace them before reassembly. e) To install the PCB, make certain that four plastic standoffs are present on the control panel studs. f) Slide the board onto the studs g) Install four plastic washers onto the studs. h) Important: over tightening the PCB nuts will cause malfunction – Each nut sets the height of a separate control panel switch. Too low, and they cannot be actuated, too high and they jam against the front panel label, and are always in the ‘ON’ state. i) Tighten the nuts only until the buttons on the control panel click when pressed – do not over tighten. Each nut sets the height of a separate control panel button. Tighten each nut a ¼ turn in succession, trying each corresponding button as you go. j) Once each control panel button clicks when pressed, installation is complete. 6.11 Removing the motor a) Remove the cabinet assembly as previously described. b) Cut and remove all wire harness zip ties. c) Flip the base assembly up-side down and drill off the heads of the three exhaust air channel rivets with a 3/16” drill bit. d) Set the exhaust cover aside e) The guard bowl is held in place with six low-profile head rivets, 5/32 nominal diameter. To remove them, drill the heads off with a 3/16” drill bit. f) Lift the base assembly off of the guard bowl and set it aside. g) Flip the guard bowl.

REV: A 8 h) The motor is held in place with 4 #8 Nylok nuts. Remove them with an 11/32” nut driver. i) Slide the motor and motor gasket out of the guard bowl’s motor well. 6.12 Replacing the motor a) Make certain that new rubber washers are used on the motor mounting studs when installing a motor. b) Locate the seam on the inside of the guard bowl wall. c) Position the motor so its wires exit approx 180 deg away from the guard bowl seam. d) Install the motor and gasket into the guard bowl with the wire harness positioned as described above. e) Drive 4 #8 Nylok nuts onto the motor studs with an 11/32” nut driver. f) Turn the guard bowl assembly upside down with the guard bowl seam facing you. g) Place the base assembly (with line cord facing away from you) onto the guard bowl. h) IMPORTANT: Make certain that no wires are pinched between the guard bowl and base! i) IMPORTANT: Tuck a portion of the motor wire harness into the rectangular cutout in the base. See fig 1. Figure 1

REV: A 9 j) Fasten the guard bowl to the base with six 5/32 nominal diameter, low-profile head rivets. k) Install the exhaust air cover with three 5/32” rivets. Make certain that the motor wire harness is contained within the cover’s wire channel. See fig 2. Fig 2 l) Replace the zip tie removed earlier m) The lower assembly is complete. 6.13 Power Connections and Final Assembly IMPORTANT: These steps must be followed to avoid personal harm and to avoid damaging the PCB. a) Make certain that the lower assembly is unplugged from the mains supply. b) Connect the motor/power connector to Jx on the PCB c) Carefully place the cabinet onto the base taking care not to pinch any wires between the two. d) Complete the assembly by replacing the six #8 screws, washers and lock washers with a #2 Phillips driver.

REV: A 11 8 FINAL CENTRIFUGE ASSEMBLY ITEM NO. PART NUMBER DESCRIPTION QTY 1 02-003-0-0009 642 LOWER ASSEMBLY 1 2 7786021 642/842 HORIZONTAL ROTOR, 6 PLACE, DRILLED 1 3 3022006 NUT, 5/16-18, NYLOK 1 4 3000002 TAPE, REFLECTIVE, RPM CHECK 1 5 02-003-0-0071 642 CABINET ASSEMBLY 1 6 3033003 WASHER #8, FLAT, SILVER 6 7 3033001 #8 SPLIT LOCK WASHER 6 8 3012006 SCREW, 8-32 x 0.375, PAN HEAD PHILIPS, SILVER 6 9 7724026 SERIAL NUMBER 1 10 7724029 FACTORY CALIBRATION LABEL 1 11 OEM SPECIFIC 642VFD FRONT PANEL LABEL 1

REV: A 12 9 CABINET ASSEMBLY ITEM NO. PART NUMBER DESCRIPTION QTY 1 7710185 642/614 CABINET 1 2 3051001 STUD, 6-32 x 7/8 2 3 3051003 STUD, 6.32 x .625 6 4 03-1-0005-0055 #8 PEM STUD, 5/8 LONG, PEM #FH832-10 1 5 3023001 NUT INSERT, 8-32 THREAD 4 6 7732018 MOTOR WELL GASKET 1 7 7745017 642/755 LID TRAY ASSEMBLY 1 8 7717049 CYCLE COUNTER 1 9 N/A N/A 1 10 3003002 STANDOFF, .320 x .203, 642 BOARD MOUNT 4 11 OEM SPECIFIC PCB 1 12 3033002 WASHER, # 6 FLAT NYLON, WHITE 4 13 3022002 NUT, 6.32, NYLOK, SILVER 8 14 7713003 HINGE SPACER 2 15 7724071 FRICTION HINGE 2 16 3012009 SCREW, 8.32 x 1.00, PAN HEAD, PHILLIPS, SILVER 4 17 02-002-1-0000 614/642 LID ASSEMBLY 1 18 3012004 SCREW, #6 x .375, PH/PHIL, SELF TAP, BLUNT, SILVER 4 19 OEM SPECIFIC LABEL, OPEN/CLOSE 1 20 OEM SPECIFIC UNLOCKING INSTRUCTION LABEL 1 21 OEM SPECIFIC 642 STOP WARNING LABEL 1

REV: A 13 10 LOWER ASSEMBLY ITEM NO. PART NUMBER DESCRIPTION QTY. 1 7710188 642 Cabinet Base, Flanged 1 2 3000001 RIVET, POP, 0.16 X 0.375 9 3 3023001 NUT INSERT, 8-32 THREAD 11 4 7724037 614/642 #8-32 SUCTION FOOT 4 5 03-1-0005-0055 #8 PEM STUD, 5/8 LONG, PEM #FH832-10 1 6 3000005 STRAIN RELIEF, LINE CORD 1 7 7751043 BREAKER, 4A 1 8 7724002 LABEL, GROUND 1 9 02-003-1-0014 614/642 GUARD BOWL, COATED 1 10 02-005-1-0000 MOTOR ASSEMBLY 1 11 3022003 8/32 NYLOCK NUT 4 12 7732019 642/842 GASKET, ROTOR CHAMBER 1 13 7713027 614/642/643/755 EXHAUST AIR DEFLECTOR 1 14 3033012 #8 INTERNAL TOOTH WASHER 1 15 3022001 8-32 HEX NUT 1 16 7729009 653ES/614V MOTOR CAPACITOR, 5 MICROFARAD 1 17 3012007 SCREW, PHILLIPS, 8-32, 0.50 LONG 1 18 7760002 ALL MODELS, CORD, LINE, WEBBER, TYPE B 1

REV: A 14 11 MOTOR ASSEMBLY ITEM NO. PART NUMBER DESCRIPTION QTY. 1 7735049 642 PSC Motor / 115 VAC 1 2 3062001 PIN, ROLL, 642 MOTOR DRIVE, .010 x 0.625 1 3 7786028 642/643 TAPERED ROTOR HUB 1 4 7728103 614/642 Motor Ring 1 5 3003003 WASHER, RUBBER, MOTOR MOUNT 0.175 x 0.5 OD x 0.18 4 6 3081003 DISCONNECT, 0.18", FEMALE 2 7 03-1-0005-0000 WIRE, BLACK 1

REV: A 15 12 REVISION HISTORY Revision # Date Details of Change Original 07/07/2013 Original Issue - DR-2958.