Pump Troubleshooting - Hydromatic S Installation And Service Manual

Pump
Troubleshooting
WARNING: Before handling
these pumps and controls,
always disconnect the power
first.
Do not smoke or use sparkable
electrical devices or flames in
a septic (gaseous) or possible
septic sump.
Below is a list of common
problems and the probable causes:
Pump will not start.
1. No power to the motor. Check
for blown fuse or open circuit
breaker.
2. Selector switch may be in the
Off position.
3. Control circuit transformer
fuse may be blown.
4. Overload heater on starter may
be tripped. Push to reset.
Pump will not start and
overload heaters trip.
1. Turn off power and check
motor leads with Megger or
ohmmeter for possible ground.
2. Check resistance of motor
windings. All 3 phases should
show the same reading.
3. If no grounds exist and the
motor windings check OK,
remove pump from sump and
check for clogged or blocked
impeller.
Pump operates with selector
switch in Hand position but will
not operate in Auto position.
1. This indicates trouble in the
float level control or the
alternator relay.
2. To check for defective float
control, put selector switch in
Auto position and turn off
main power. Put a jump wire
on terminal strip. Turn on
power and if pump starts,
trouble is in float control.
Replace control.
Pump runs but will not shut off.
1. Pump may be air locked. Turn
pump off and let set for
several minutes, then restart.
2. Lower float control may be
hung up in the closed position.
Check in sump to be sure
control is free.
3. Selector switch may be in the
Hand position.
Pump does not deliver proper
capacity.
1. Discharge gate valve may
be partially closed
partially clogged.
2. Check valve may be partially
clogged. Raise level up and
down to clear.
3. Pump may be running in
wrong direction. Low speed
pumps can operate in reverse
direction without much noise
or vibration.
4. Discharge head may be too
high. Check total head with
gauge when pump is operating.
Total head is discharge gauge
pressure converted to feet plus
vertical height from water
level in sump to the center line
of pressure gauge in discharge
line. Gauge should be installed
on pump side of all valves.
Multiply gauge pressure in
pounds by 2.31 to get head
in feet.
5. If pump has been in service for
some time and capacity falls
off, remove pump and check
for wear or clogged impeller.
Motor stops and then restarts
after short period but overload
heaters in starter do not trip.
1. This indicates heat sensors in
the motor are tripping due to
excessive heat. Impeller may
be partially clogged giving a
sustained overload but not high
enough to trip overload heater
switch.
2. Motor may be operating out
of liquid due to a failed level
control. All Hydromatic S
submersible
operate for extended periods
out of water without burning
up the winding, but the
heat sensors
prolonged life by controlling
winding temperature.
3. Pump may be operating on
a short cycle due to sump
being too small or from water
returning to sump due to a
leaking check valve.
or
motors can
give motor
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