40
MSC Troubleshooting
TURN OFF POWER TO THE MOTOR WHILE PROGRAMMING THIS DEVICE.
• If the device has a potentiometer or a 2-Speed switch, a jumper wire can be placed in between the 10V
In and 10V Out terminals to rule out a defective device. This will cause the motor to go to HIGH
SPEED.
• The IO STATUS menu can be used to verify the inputs and outputs of the device are functioning as
expected.
• The FAULT HISTORY menu can be used to keep track of faults while working on the device.
Fault
Problem
Potential Cause
Corrective Action
Feedback Fault
Feedback Fault on
MSC Display
Disconnected/faulty
wiring
Secure connections to
fan. If faulty wiring is
found, repair or replace
as required.
No feedback for 30
seconds
Check parameters
Less than 70% of RPM
Check duct/fan for
obstructions.
Modbus
Modbus fault on MSC
Display
Faulty Cat 5
connection/cable
Find and replace faulty
cable
ECPM03 does not
recognize device
Verify Modbus # on
device is set correctly.
Variable Device Fault
Motor not responding to
changes made on
variable device
(potentiometer)
Defective
potentiometer
Replace potentiometer
Faulty wiring to motor
Find and replace faulty
wiring.
Motor not responding
Motor not functioning
as expected
2-Speed switch not
working
Check switch and
wiring.
Wiring to motor
defective
Find and replace faulty
wiring.
Check for other faults
on MSC display
If no other faults are
present, motor maybe
defective.
Summary of Contents for D76
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