IMO ACF5 - Page 23

ACF5 0601.01 GB
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23
Problem Cause What to do
Pressure too high - The pressure relief valve is set too
high.
- The oil is too cold (or has higher
viscosity than anticipated).
- Counter pressure in the discharge
line is too high.
Readjust the pressure relief valve.
Reduce the pressure seing until opera-
tional temperature has been reached.
Check the discharge line.
Drive motor dicult to
start or tends to stop by
tripping the motor overload
relay
- Counter pressure too high.
- Liquid too cold.
- Motor is undersized for the prevail
-
ing conditions.
- Electrical power supply faulty.
- Motor overload relay set too low or
is faulty.
- Incorrect seing of Y/D starter.
See above: Pressure too high.
Readjust the pressure relief valve to a
lower value. Thus the power consump-
tion for the pumping is relieved and
overloading due to the high viscosity
may be avoided. When the liquid has
reached normal temperature and thus
ows easily, the relief valve is reset to
normal pressure.
Check the motor.
Check the motor and motor connection.
Readjust or replace the relay.
Readjust the seing of the starting
sequence. The time before the motor
overload relay is tripped should not
exceed 10-15 seconds.
Noise and vibration
26
m
Monitor the
pump function
and shut down
if any sign of
malfunction is
noticed
- The ow to the pump is insucient.
- Insucient support of pipe work.
- Bad alignment
- Air leakage into the suction line.
- Free air in the liquid or gas cavita
-
tion.
- Faulty electrical supply.
See chapter: The ow is too low.
Check for pipe vibrations in the pump
connections. Check that the pipes are
suciently clamped.
Check alignment, see page 4.
Check the suction line for air leakage.
For pumps with Tuning:
Adjust the Tuning. If this does not help
or for pumps without Tuning: Contact
your IMO representative or IMO serv-
ice dept.
Check all three phases of the supply.