Nortec HP Series - Manual (Page 50)

47 | Troubleshooting
Table 6: Troubleshooting
Problem Cause / Solution Recommendations
Pump module will not run. The power supply to pump is
off and needs to be turned on.  Turn the power supply on.
Circuit breaker has interrupted
the pumps power supply.  Check that the power supply connection to
pump is wired correctly.
 The power supply circuit could be overloaded.
Motor contactor is not making
contact.
 Check for correct voltage on transformer
120/208/230/460/575.
 Breaker on 24 VAC control circuit has blown,
check for short circuit.
 Check alignment and operation of contactor
mechanism.
 Contact surfaces of contactor may be
damaged.
 Check low inlet water pressure.
VFD has faulted out.  Reset, check error messages for more
information.
The pump motor may be
damaged.
 The motor bearings may be damaged and
have caused a lock up. Inspect and replace if
necessary.
 The motor may have shorted or have been
single phased or overloaded without
protection.
Pump head mechanism may
have been damaged.  Brass pump crank bearings/connecting rods
may have become damaged /frozen causing
the motor to lock up. Disassemble pump head
and repair/replace as required.
Pump module has stopped
running and red lamp is on. Thermal overload circuit has
blown. The pump module
motor could have overheated
and its thermal protection
circuit needs reset.  Check motor FLA rating and check overload
setting.
 Check for a short in the circuit running
optional control equipment.
 Reset Overload and measure actual motor
amp draw.
 The pump module must never be operated
above 1200 P.S.I. (83 BAR).
 Proper ventilation must be provided to prevent
the motor from over-heating.
 The motor may be operating outside its‟
service factor as a result of power supply low
voltage.
 A combination of all of the three previous
points could be in effect.