VAF instruments OILCON MARK 6M, Technical Manual

Page: 104 / 175

103
15.11 SAMPLE PUMP PROBLEMS
15.11.1 Electrical problems
15.11.1.1 Pump runs but the green indicator on the starter box is off
Probable causes Action
1
Indicator failure.

Check power supply to indicator lamp.

Check indicator lamp.
15.11.1.2 Pump should be running but is off
Probable causes Action
1
3-phase power supply failure.

Check if the 3-phase power supply is switched on.

Check the fuses of the 3-phase power supply. the
water supply to the pump.
2
Thermal trip of the pump. 
Check the terminal trip on the pump contactor in the
starter box.
The red light is ON.
Reset if necessary.
3
Pump contactor failure. 
Check the power on the contactor terminals (1,2), these
should be 24 VDC.
Also check also for correct polarity.

Check the 24 VDC power supply in the EPU.

Check the connections between the starter box and the
EPU.
NOTE:
If the motor repeatedly trips out on thermal trip, check the motor and pump for binding
or blockages etc. do not force the motor to run.
15.11.2 Pump related problems
NOTE:
During forward flush and in sample mode, normal operating conditions are:

Pump discharge pressure 5 to 8 bar. (0.5 to 0.8 MPa).

Pump suction pressure 0 to 1 bar. (0 to 0.1 MPa).
(Pressures may vary from one installation to another)