Troubleshooting* 19
Fault Possible Causes Solution
Over Current
Shorted output Check for any shorts in motor cables.
Locked rotor Check for debris in pump.
Damaged wire insulation Check motor wire insulation with a megger.
Over Voltage
Internal Drive short
With power to Drive off, measure outputs with
ohmmeter to detect short.
Power cycling on and off
Check for a generator or switching on input
line.
High line voltage
Measure incoming line voltage to Drive; should
be between 190V and 265V.
Under Voltage
Low line voltage
Temporary loss of power Check for local power outage.
Excessive load current
Check motor is correctly sized for the
application.
Loss of a motor phase
Check correct voltage is present on all motor
leads.
Power was removed from Drive
Check correct voltage is present on all input
lines.
Cannot Start Motor
Exceeding Service Factor Amps
Check Service Factor Amps entered are
correct.
Check pump and motor are correct.
No Service Factor Amps value entered
Check Service Factor Amps entered and are
correct.
There is an open (connection) in motor
wires
Check resistance of all motor wires is correct.
Locked rotor Pull pump check for debris in pump.
Dry Run
Operation at open discharge
May need to reduce Dry Run Sensitivity
pressure or apply back pressure on transducer.
Drive cannot read transducer signal
Check linearity of transducer, as it may be
damaged. See Troubleshooting Guide for more
information.
Possible leak Check for pipe break or large leak.
Dry running pump Check water level in well.
Ground Fault
Ground wire shorted to motor phase
Check the ground wire for short to motor
phase wire or check insulation integrity with a
megger.
Long motor cable length
If motor cable length is more than 305m
a reactor or filter may be needed to limit
capacitance between motor wires.
System Not
Grounded
Ungrounded Drive
Ground Detect parameter can be disabled, but
will reactivate after 72 hours.
Unbalanced or three phase incoming
voltage.
Line to line voltage must be twice line to
ground voltage. You cannot use two legs from
three phase power.
PID_OM_2014.indd 19 24/02/2014 1:49:59 PM
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