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Cause
The installation is not receiving
voltage.
The impeller is stuck.
Always state the serial number of the product, see
7.3 The pump does not stop when a level sensor is used
DANGER: Crush Hazard
Moving parts can entangle or crush. Always disconnect and lock out power before servicing
to prevent unexpected startup. Failure to do so could result in death or serious injury.
Cause
The pump is unable to empty the
sump to the stop level.
There is a malfunction in the
level-sensing equipment.
The stop level is set too low.
Always state the serial number of the product, see
7.4 The pump starts-stops-starts in rapid sequence
Cause
The self-holding function of the
contactor malfunctions.
P7900 Installation, Operation, and Maintenance Manual
Remedy
Check that:
• The main power switch is on.
• There is control voltage to the start equipment.
• The fuses are intact.
• There is voltage in all phases of the supply line.
• All fuses have power and that they are securely fastened to the
fuse holders.
• The overload protection is not tripped.
• The motor cable is not damaged.
Clean:
• The impeller
• The sump in order to prevent the impeller from clogging again.
Product Description
Remedy
Check that:
• There are no leaks from the piping and/or discharge connection.
• The impeller is not clogged.
• The non-return valve(s) are functioning properly.
• The pump has adequate capacity. For information:
Contact a sales or authorized service representative.
• Clean the level regulators.
• Check the functioning of the level regulators.
• Check the contactor and the control circuit.
• Replace all defective items.
Raise the stop level.
Product Description
Remedy
Check:
• The contactor connections.
• The voltage in the control circuit in relation to the rated voltages
on the coil.
• The functioning of the stop-level regulator.
• Whether the voltage drop in the line at the starting surge causes
the contactor's self-holding malfunction.
7 Troubleshooting
on page 10.
on page 10.
69
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