Service Manual — COATS Model IBS 2000 • 23
Optical Encoder Checking Procedure
This procedure allows you to check the optical
encoder to determine if it is operating properly. A
defective encoder can result in spin or braking prob-
lems.
1.
When reading the voltages on the white and green
wires, turn the faceplate
slowly
by hand. The low volt-
age must be less than .7VDC. The high voltages must
be greater than 4.0VDC.
2.
Voltage readings are taken with all optical encoder
wires connected.
Lead Color
Voltage
GREEN to PURPLE - 2.4 ± .5VDC
YELLOW to PURPLE - Less than .7VDC; greater
than 4VDC
BLUE to PURPLE - Less than .7VDC; greater
than 4VDC
Refer to the wiring diagram.
Rotary Shutter Checking Procedure
This procedure will detect movement of the rotary
shutter during a spin cycle. Slippage of the shutter
wheel can cause the weight location to change result-
ing in weight chasing, or spin error messages as a
result of an incorrect encoder count.
1.
Mount a balanced wheel on the machine. Add a 4
oz. weight to the outside plane and spin the wheel.
2.
Rotate the wheel so the center position LED light
is on. Mark the tire or wheel with respect to the wit-
ness mark on the motor.
3.
Spin the wheel again, then rotate the wheel so the
center position light comes on again. Note the position
of the mark you made on the tire or wheel. You may
need to make several spins.
4.
If the position changes, the rotary shutter has
slipped. Refer to the Rotary Shutter Replacement pro-
cedure to tighten and recheck.
Note: This procedure can be used to check
for loose faceplate, however mark the face-
plate instead of the wheel.
Piezo Output Test
This procedure allows you to look at the piezo output
readings to diagnose a problem with any of the piezos.
Piezo problems can cause incorrect weight readings
resulting in weight chasing problems.
1.
Go to the main menu and select DIAGNOSTICS,
press enter.
2.
Select PIEZO OUTPUTS, press enter. The screen
will now display the piezo readings. Each piezo is meas-
ured individually, L = left, RF = right front, and RR =
right rear.
3.
The amplitude reading is the one we will refer to for
diagnosis. Only use the first number to the right of the
decimal, disregard all others.
4.
Using a balanced wheel, put a 4oz. weight on the
outside, spin the wheel. The left reading should be
approximately 25% less than the right front and right
rear readings. Both right readings should be approxi-
mately the same.
5.
Spin the wheel for several revolutions and note the
readings in between each spin. Look for consistency in
the readings.
6.
Now remove the 4 oz. wt., with a balanced wheel
add a 1oz. weight to the outside of the wheel. Spin the
wheel and check the piezo outputs. Add a 2 oz. weight
where the 1 oz. was, and spin the wheel. The readings
should double. Add a 3 oz. weight and the readings
should triple.
Note: If the readings fluctuate a great deal
check the piezo connector and refer to the
“Piezo Replacement Procedures”.
Direct Drive
Summary of Contents for Coats IBS 2000
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Page 26: ...22 Service Manual COATS Model IBS 2000 Direct Drive Motor Controller Diagram...
Page 36: ...32 Service Manual COATS Model IBS 2000 Direct Drive IBS 2000 Wiring Diagrams...
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