Liberty Pumps AE-Series - Manual (Page 11)

Alarm Horn
Pressing the alarm 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 with horn of same type.
Alarm Light
Pressing the alarm test/normal/silence switch to
the test position or activating the alarm fl oat should
turn on the alarm light. If the light does not activate,
replace with bulb of same type.
Alternating Relay or Device
The alternation can be sequenced by lifting the
fl oat switches or making jumper wires to simulate
the fl oats closing. If the alternator fails during
testing, replace with same type. Consult factory
at 1-800-RHOMBUS (1-800-746-6287) when in
doubt about testing procedures or results.
Float Controls
Check the fl oats through 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 float
resistance:
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 the fuse. Pull the fuse out
of the fuse block. 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
Contacts - Check the contacts for severely burnt
or welded contacts. The contactor arm should
move freely.
Coil - Measure 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. If contactor is defective,
replace with same type.
NOTE: Readings may vary slightly depending on
the and accuracy of the measuring device.
Motor Protective Switch
Test by inserting a paper clip or other small device
into the test hole and push to the left. The relay
should trip.
Troubleshooting
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