The Pump Does Not Start; The Pump Does Not Stop When A Level Sensor Is Used; The Pump Starts-Stops-Starts In Rapid Sequence - Goulds Pumps 2GFK3812A Installation, Operation And Maintenance Manual

7 Troubleshooting

7.1 The pump does not start

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.
NOTICE:
Do NOT override the motor protection repeatedly if it has tripped. Do-
ing so may result in equipment damage.
Cause Remedy
An alarm signal has Check that:
been triggered on the
• The impeller rotates freely.
control panel.
• The sensor indicators do not indicate an
alarm.
• The overload protection is not tripped.
The pump does not Check that:
start automatically, but
• The start level regulator is functioning.
can be started man-
Clean or replace if necessary.
ually.
• All connections are intact.
• The relay and contactor coils are intact.
• The control switch (Man/Auto) makes con-
tact in both positions.
Check the control circuit and functions.
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 4.
16
7.2 The pump does not stop when a level
sensor is used
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.
If the problem persists, then contact a sales or authorized service rep-
resentative.
Always state the serial number of the product, see
on page 4.
7.3 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.
Product Description
The self-holding func-
tion of the contactor
malfunctions.
If the problem persists, then contact a sales or authorized service rep-
resentative.
Always state the serial number of the product, see
on page 4.
GFK-GFV Series Installation, Operation, and Maintenance Manual
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
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 in-
formation:
Contact a sales or authorized service rep-
resentative.
• Clean the level regulators.
• Check the functioning of the level regula-
tors.
• Check the contactor and the control circuit.
• Replace all defective items.
Raise the stop level.
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.
Product Description
Product Description