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PROBLEM
Flashing
OVER V
Flashing of
OPEN
PHASE
Flashing of
THREE
PHASE
UNBALANCE
Flashing of
PHASE
REVERSAL
Flashing of
OVER TEMP
POSSIBLE CAUSE
The running voltage is higher than
the calibrated voltage, pump is in
over voltage protection state
Power supply phase loss
Loose wires or no connections on the
controller and/or pump
T h e v o l t a g e b e t w e e n t h r e e
phase(R/S/T) is not same and the
difference is more than ±15%
Phase sequence of the three phase
input voltage (R/S/T) is not uniform
The temperature in the motor
winding is high and the thermal
switch contact is open
No communication link between
computer and controller
SOLUTION
Report high line voltage to the power
utility company
Controller will attempt to restart the
pump every 5 minutes until line
voltage is restored to normal
Report to the power utility company
Check and reconnect power and
pump cable
Report to the power utility company
Controller will attempt to restart the
pump every 5 minutes until the
voltage between three phases is
restored to normal
Change the sequence of the three
phase (R/S/T)
Wa i t f o r t h e m o t o r w i n d i n g
temperature to cool down the
thermal switch is open.
Connecting the controller to SC
/computer for remote monitoring
21
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