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7 Troubleshooting
Cause
Remedy
The installation is not
Check that:
receiving voltage.
• The main power switch is on.
• There is control voltage to the start equip-
ment.
• The fuses are intact.
• There is voltage in all phases of the supply
line.
• All fuses have power and that they are se-
curely fastened to the fuse holders.
• The overload protection is not tripped.
• The motor cable is not damaged.
The impeller is stuck.
Clean:
• The impeller
• The sump in order to prevent the impeller
from clogging again.
If the problem persists, then contact a sales or authorized service rep-
resentative.
Always state the serial number of the product, see
on page 5.
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 start-
up. Failure to do so could result in death or serious injury.
Cause
Remedy
The pump is unable to
Check that:
empty the sump to the
• There are no leaks from the piping and/or
stop level.
discharge connection.
• The impeller is not clogged.
• The non-return valve(s) are functioning
properly.
• The pump has adequate capacity. For in-
formation:
Contact a sales or authorized service rep-
resentative.
There is a malfunction
• Clean the level regulators.
in the level-sensing
• Check the functioning of the level regula-
equipment.
tors.
• Check the contactor and the control circuit.
• Replace all defective items.
The stop level is set
Raise the stop level.
too low.
If the problem persists, then contact a sales or authorized service rep-
resentative.
Always state the serial number of the product, see
on page 5.
18
7.4 The pump starts-stops-starts in rapid
sequence
Cause
The pump starts due
to back-flow which fills
the sump to the start
level again.
The self-holding func-
tion of the contactor
malfunctions.
Product Description
If the problem persists, then contact a sales or authorized service rep-
resentative.
Always state the serial number of the product, see
on page 5.
7.5 The pump runs but the motor protection
trips
NOTICE:
Do NOT override the motor protection repeatedly if it has tripped. Do-
ing so may result in equipment damage.
Cause
The motor protection
is set too low.
The impeller is difficult
to rotate by hand.
The drive unit is not
receiving full voltage
on all three phases.
The phase currents
vary, or they are too
Product Description
high.
The insulation be-
tween the phases and
ground in the stator is
defective.
Remedy
Check that:
• The distance between the start and stop
levels is sufficient.
• The non-return valve(s) work(s) properly.
• The length of the discharge pipe between
the pump and the first non-return valve is
sufficiently short.
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.
DANGER: Crush Hazard
Moving parts can entangle or crush. Always disconnect and
lock out power before servicing to prevent unexpected start-
up. Failure to do so could result in death or serious injury.
Remedy
Set the motor protection according to the da-
ta plate and if applicable the cable chart.
• Clean the impeller.
• Clean out the sump.
• Check that the impeller is properly trim-
med.
• Check the fuses. Replace fuses that have
tripped.
• If the fuses are intact, then notify a certified
electrician.
Contact a sales or authorized service repre-
sentative.
1. Use an insulation tester. With a 1000 V DC
megger, check that the insulation between
the phases and between any phase and
ground is > 5 megaohms.
2. If the insulation is less, then do the follow-
ing:
Contact a sales or authorized service rep-
resentative.
1310 Installation, Operation, and Maintenance Manual
Product Description
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