37
Donaldson Company, Inc.
Problem
Probable Cause
Remedy
IEC Control Panel with Starter, PLC, and Magnehelic Gauge
Blower motor does not
start
If a blower motor fails to
start or shuts down due to
a short, overload or other
fault, the panel indicates
an alarm by flashing the
RUNNING light. Two amber
lights flash in a pattern
indicating which circuit
tripped the alarm.
Improper motor wire size
Rewire using the correct wire gauge as specified by
national and local codes.
Not wired correctly
Check and correct motor wiring for supply voltage.
See motor manufacturer's wiring diagram. Follow
wiring diagram and the National Electric Code.
Unit not wired for available
voltage
Correct wiring for proper supply voltage.
For example: The overload
on the manual motor
protector #3 trips. The
RUNNING light starts
flashing. The amber lights
blink three times indicating
the #3 motor. The alarm
feature repeats itself until
the STOP button is pressed
and the circuit is reset.
Branch circuit protection or
overload tripped
Disconnect power using the disconnect switch.
Press the black start button on the Manual Motor
Protector, MMP. The red stop button should remain
extended. The overload relay in the MMP resets
automatically when the black start button is reset.
Defective motor branch circuit
protection or overload relay
Replace as necessary.
Defective control transformer
or control transformer branch
circuit protection
Disconnect power using the disconnect switch.
Check the control transformer T1, the primary fuse
FU1, and the secondary fuse FU2. If fuses are good,
check output voltage for 115-Volts. Replaced the
transformer if output voltage is excessively high or
low.
Pulse cleaning does not
operate
Defective wiring
Check wiring to solenoid valves.
Defective solenoid valves
Check solenoid coils and replace as necessary.
PLC output is not energized or is
defective
Check supply voltage to the PLC timer. If voltage
is not present at PLC Terminals L and N, check the
control transformer fuses FU1 and FU2. Observe the
output LED's corresponding to the wiring diagram.
Set the selector switch SW1 to ON. The LED's flash in
sequence indicating the PLC is pulsing the solenoid
valves. Check the output voltage between neutral N,
302, 303, and remaining solenoid connections using
an analog voltmeter set to the 150-Volt AC scale.
The needle deflects if voltage is present when LED
flashes. If LED's do not flash or no voltage is present,
replace the PLC.
Lack of compressed air
Maintain 50-60 psig. Adjust as necessary.
Troubleshooting
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