BJM Pumps PGV220-575T - Manual (Page 14)

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2) Pump fails to run, or runs but fails to reach full speed.
Voltage drop in power line Check whether or not the power voltage is normal
Single-phase run Power switch, operation switch or pump cable
with either one wire opened or disconnected.
Inspect and repair or replace.
Stuck impeller Repair
Motor trouble Causes: Insulation fault, interlayer and interphase
short-circuit, single-phase disconnection
Inspect and repair.
3) Pump runs at full speed, but produces abnormal noise mechanically.
Broken impeller Replace
Worn or damage bearing Replace
Low level running Not harmful, but less pumping rate and low
efficiency, caused by low suction level. Raise
suction level or stop the pump
4) Small pumping rate (capacity)
Reverse rotation of pump Interchange two wires of the cable
for correct rotational direction
Impeller clogged with foreign matter Remove foreign matter
Clogged pipe Repair
Small size pipe Replace
Water leakage from pipeline and channel Inspect and repair
5) Motor overheated
Overload Large mixture percentage of solids
to pumping water or use of liquids
with high viscosity or high specific
gravity.
Motor exposed to atmosphere Consider of the pump location and
adjust or relocate.
Motor abnormal Inspect insulation fault, interlayer
short-circuit and interphase short-
circuit.
In this event, the over current relay
of the operation switch might work.
If failed to work, check whether the
relay is properly set. In many cases,
motor abnormal is primarily caused
by its insulation down by leaked
water in section 7.