Liberty Pumps AE-Series - Manual (Page 5)

the alarm light. If the light does not activate, replace
with bulb of same type.
Float Controls
Check the floats during their entire range of
operation. Clean, adjust, or replace damaged fl oats.
Checking the float resistance - The float
resistance can be measured to determine if the
fl oat is operating correctly or is defective. Use the
following procedure to measure the fl oat resistance.
Warning: Disconnect all incoming power to
panel. Failure to do so could result in serious
or fatal electrical shock.
1. Isolate the fl oat by disconnecting one or both of
the fl oat leads from the fl oat terminals.
2. Place one ohmmeter lead on one of the fl oat
wires, and the other ohmmeter lead on the other
fl oat wire.
3. Place the ohmmeter dial to read ohms and
place on the R X 1 scale. With the fl oat in the
“off” position, the scale should read infi nity (high
resistance). Replace the fl oat if you do not get
this reading. With the fl oat in the ON position,
the scale should read nearly zero (very low
resistance). Replace the fl oat if you do not get
this reading.
NOTE: Readings may vary depending on the
length of wire and accuracy of the measuring
device.
Fuses
Check the continuity of each fuse. With power
OFF, pull the fuses out of the fuse blocks. With the
ohmmeter on the R X 1 scale, measure resistance.
A reading of infi nity indicates a blown fuse and must
be replaced. Replace fuse with same type, voltage
and amp rating.
Magnetic Contactor Coil
Warning: Disconnect all incoming power to
panel. Failure to do so could result in serious
or fatal electrical shock. Check the coil by
disconnecting one of the coil leads. Measure the
coil resistance by setting the ohmmeter on the R
X 1 scale. A defective coil will read zero or infi nity,
indicating a short or opened coil respectively.
Replace defective contactor with same type.
Control/Alarm Circuit Board Power
If the green power status indicators are not
illuminated:
1. Check to see if the fuses on the circuit board
are blown.
2. Check to see if the incoming control/alarm
power is present at TB1-1 and TB1-2.
If voltage is present and fuse is not blown,
please call factory for assistance.
Circuit Breaker (optional)
Check each pole of the circuit breaker for proper
resistance reading using the following procedure:
Warning: Disconnect all incoming power to
control panel. Failure to do so could result in
serious or fatal electrical shock.
1. Isolate the circuit breaker by disconnecting
either the line side or load side wires.
2. Place the ohmmeter leads across the
corresponding line and load terminals of each
pole.
3. With the ohmmeter on the R X 1 scale and the
breaker in the OFF position, the reading should
be infinity (very high resistance). With the
breaker in the ON position, the reading should
be nearly zero ohms (very low resistance). If
the readings are not as stated, replace the
circuit breaker with one of the same ratings.
Alarm Horn
Moving the test/normal/silence switch to the test
position or activating the alarm fl oat should turn on
the alarm horn. If the horn does not sound, replace
horn with same type.
Alarm Light
Moving the test/normal/silence switch to the test
position or activating the alarm fl oat should turn on
Troubleshooting
7249000B - 5 -