HENNESSY INDUSTRIES Coats IBS 2000, Service Manual And Troubleshooting Manual

Service Manual — COATS Model IBS 2000 • 29

20.

Tighten the nyloc nuts until the distance from the

top of the motor cradle to top of the piezo spring retainer
is two (2) inches.

21.

Connect fan motor to P1 of the Motor Controller Board.

22.

Connect optical encoder cable, and piezo cables to

the CPU Board.

23.

Connect drive motor plug to P2 of the Motor

Controller Board.

24.

Install the weight tray, weight tray shield and motor

cover and plug in the balancer.

Caution! Always make sure there is nothing
touching the motor or motor housing. This
can affect weight readings.

25.

Perform FUNCTION CHECKS.

Note: Always check the adjustment of the Left
Front threaded piezo/motor rod. This adjust-
ment is critical to the correct operation of the
A & D arm. It should be adjusted so that the
tip is 5.75 Inches from the motor plate.

Faceplate & Shaft Assembly Replacement

Note: This procedure should be performed by
Authorized Hennessy service personnel.
Improper installation could result in damage
to the motor shaft which would require a new
MOTOR ASSEMBLY!

1.

Remove the old faceplate assembly.

2.

Clean the contacting surfaces of the motor shaft and

inside the faceplate assembly with a soft cloth.

3.

Check the runout of the shaft at two points, A & B.

the runout should not exceed .0006 (6 ten thousandths)
at either point. If runout exceeds this measurement, see
MOTOR REPLACEMENT.

4.

Slide the six inch socket head bolt (included with new

assembly) and the Allen wrench into the shaft. HAND
TIGHTEN!

5.

Attach the torque wrench. Hold the faceplate with

one hand to keep from slipping. Tighten to 20 ft./lbs.

Caution! DO NOT OVER TIGHTEN! Over tight-
ening will result in damage to the motor shaft.

6.

Check the runout on the faceplate The runout should

not exceed .002.Check the shaft on the inside portion
(behind the threads). This runout should not exceed .001
(1 thousandths).

7.

If the runout is excessive, loosen socket head bolt

and rotate the faceplate assembly 90 degrees (1/4 turn)
relative to the witness mark on the motor and retighten.
Repeat until minimum results are achieved.

Piezo Assembly Replacement

Note: The piezo assemblies used in the IBS
2000 are different from the other Coats bal-
ancers in that they have a 6 pin phone cable
connector instead of a wire and spade con-
nector.

1.

Unplug the balancer.

2.

Remove weight tray, weight tray shield and motor

cover.

3.

Remove the four (4) 3/8 - 16 Nyloc spring retaining

nuts, spring retainers and piezo springs.

4.

Remove the two (2) 5/16 - 18 X1 washer head

screws.

5.

Disconnect the fan motor and optical encoder con-

nections.

6.

Disconnect cables to piezo assemblies.

7.

Lift up on the motor, twist and lift the piezo assem-

blies to remove from the chassis.

Caution! Always plug piezos in before loading
the motor. If the piezos are plugged after the
motor is loaded it could discharge the elec-
tricity and short out the LCD BOARD.

Note: Before replacing a piezo assembly:

•

Refer to the PIEZO OUTPUT test.

•

Always check the connecting cables.

•

Clean piezo balls with emery cloth (or
replace with new balls) and reinstall with
AMMCO gel and plastic protectors.

8.

Use emery cloth to clean the mounting surfaces of

the piezo assemblies and chassis, install new piezo
assemblies and connect cables.

9.

Install the two (2) 5/16 - 18 X1 washer head screws.

10.

Install piezo springs, spring retainers and Nyloc

nuts.

11.

Tighten the Nyloc nuts until the distance from the

top of the motor cradle to the top of the retainer is two
(2) inches.

12.

Connect the fan motor plug to P2 of the Motor

Controller Board.

13.

Connect the optical encoder cable and the piezo

cables.

14.

Install weight tray, weight tray shield, motor cover

and plug in balancer.

15.

Perform BALANCER CALIBRATION and ARM CAL-

IBRATION.

16.

Perform FUNCTION CHECKS.

Direct Drive