Stuart Turner CH 4-30 B Installation, Operation & Maintenance Instructions Manual page 21

8.11 Dry Run Protection:
This pump is fitted with a safety control circuit, which will detect the following
fault condition:
Dry running caused by water starvation to the pump.
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Should the pump run out of water it will stop as part of a "protective logic
sequence", detailed below.
The fault should be rectified before re-starting the pump. Check that there is
sufficient water supply to the pump and also ensure that all terminal fitting
outlets are closed.
8.12 Protective Logic Sequence:
If water starvation occurs and the power supply to the pump remains
uninterrupted, the pump controller will perform the following protective
sequence.
1. If the pump detects water starvation, it will stop operation after a 1 minute
period.
2. The pump will remain in the off condition for a period of 5 minutes.
3. The pump will then re-start and if the water starvation condition remains
present, the pump will then stop operation after a 1 minute period.
4. The pump will remain in the off condition for a period of 5 minutes.
5. The pump will then re-start and if the water starvation condition remains
present, the pump will then stop operation after a 1 minute period.
6. The pump will remain in the off condition for a period of 5 minutes.
7. The pump will then re-start and if the water starvation condition remains
present, the pump will then stop operation after a 1 minute period.
8. After three consecutive resets are performed the pump will remain in the off
condition indefinitely.
9. To restart the pump, the power supply should be first isolated for a period of
at least 10 seconds before switching on again.
If the pump fails to operate normally after three attempts, then please consult
the PumpAssist team on +44 (0) 800 31 969 80.
8.13 Fault Finding:
The PCB is also fitted with a "power on" indicator light. This will remain
illuminated when mains power is supplied to the board.
The indicator light is located on the PCB within the terminal box.
This operation should only be carried out by a qualified
person
To view the light the following procedure must be followed:-
ISOLATE THE MAINS ELECTRICAL POWER SUPPLY FROM THE PUMP.
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Remove the four screws retaining the terminal box lid (Fig. 15).
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Lift the terminal box lid off.
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IMPORTANT – Ensure there is no contact with any of the internal parts of the
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terminal box.
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