Downflo Workstation, DWS 4-1 to 6-4
36
Problem
Probable Cause
Remedy
NEMA Control Box with Starter, Pulse Control and Phothelic Gauge
Blower motor does not
start
Improper motor wire size
Rewire using the correct wire gauge as specified by
national and local codes.
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.
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.
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.
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.
