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9
Pressure too high
The pressure relief valve is set too
high.
Readjust the pressure relief valve.
The oil is too cold (or has higher vis
cosity than anticipated).
Reduce the pressure setting until opera
tional temperature has been reached.
Counter pressure in the discharge line
is too high.
Check the discharge line.
Drive motor difficult
to start or tends to
stop by tripping the
motor overload relay
Counter pressure too high.
See above: Pressure too high.
Liquid too cold.
Readjust the pressure relief valve to a
lower value. Thus the power consumption
for the pumping is relieved and overloading
due to the high viscosity may be avoided.
When the liquid has reached normal tem
perature and thus flows easily, the relief
valve is reset to normal pressure.
- Motor is undersized for the prevailing
conditions.
Check the motor.
Electrical power supply faulty.
Check the motor and motor connection.
Motor overload relay set too low or is
faulty.
Readjust or replace the relay.
Incorrect setting of Y/D starter.
Readjust the setting of the starting se
quence. The time before the motor over
load relay is tripped should not exceed
1015 seconds.
Noise and vibration
- The flow to the pump is insufficient.
See previous page, Flow too low (page 8).
18
Monitor
the pump
function and
shut down if
any sign of
mal func tion
is noticed
- Insufficient support of pipe work.
Check for pipe vibrations in the pump
connections. Check that the pipes are suf
ficiently clamped.
Air leakage into the suction line.
Check the suction line for air leakage.
Free air in the liquid or gas cavitation.
Contact your IMO AB representative or
IMO AB service department.
Faulty electrical supply.
Check all three phases of the supply.
Disturbance
Cause
What to do
