Drucker Diagnostics 642VFD Manuale utente

DRUCKER DIAGNOSTICS SM004

MODEL 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

DRUCKER DIAGNOSTICS SM004

MODEL 642VFD SERVICE MANUAL REV: A 2

CONTENTS

1PREFACE............................................................................................................................................ 3

2GENERAL DESCRIPTION OF MAJOR COMPONENTS ......................................................................... 3

3WARRANTY INFORMATION .............................................................................................................. 3

4SPECIFICATIONS................................................................................................................................ 3

5TROUBLESHOOTING ......................................................................................................................... 4

6SERVICE INSTRUCTIONS.................................................................................................................... 5

7WIRING DIAGRAM .......................................................................................................................... 10

8FINAL CENTRIFUGE ASSEMBLY ....................................................................................................... 11

9CABINET ASSEMBLY ........................................................................................................................ 12

10 LOWER ASSEMBLY .......................................................................................................................... 13

11 MOTOR ASSEMBLY ......................................................................................................................... 14

12 REVISION HISTORY.......................................................................................................................... 15

DRUCKER DIAGNOSTICS SM004

MODEL 642VFD SERVICE MANUAL REV: A 3

1PREFACE

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.

2GENERAL 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.

3WARRANTY INFORMATION

3.1 The Drucker Company warrants its centrifuges to be free from defects in workmanship and parts

for two years.

4SPECIFICATIONS

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)

DRUCKER DIAGNOSTICS SM004

MODEL 642VFD SERVICE MANUAL REV: A 4

5TROUBLESHOOTING

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

DRUCKER DIAGNOSTICS SM004

MODEL 642VFD SERVICE MANUAL REV: A 5

6SERVICE 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.

DRUCKER DIAGNOSTICS SM004

MODEL 642VFD SERVICE MANUAL 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.

DRUCKER DIAGNOSTICS SM004

MODEL 642VFD SERVICE MANUAL 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.

DRUCKER DIAGNOSTICS SM004

MODEL 642VFD SERVICE MANUAL 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

DRUCKER DIAGNOSTICS SM004

MODEL 642VFD SERVICE MANUAL 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.

DRUCKER DIAGNOSTICS SM004

MODEL 642VFD SERVICE MANUAL REV: A 10

7WIRING DIAGRAM

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