Warning: Tampering with traction amplifier may void warranty.
Replace traction amplifier.
Bad traction amplifier temperature sensor.
Check amplifier base for full contact and heat sink
grease.
Inadequate heat sink.
Test diode and replace if necessary.
Open or shorted diode.
Check motor terminals, brake clearance, operation
of drive unit and wheel.
Loose motor terminals, brake drag, mechanical
binding of drive unit or wheel.
Reduce operation.
Continuous travel operation, short runs, hard
acceleration / plugging.
Solution
Possible Cause
The temperature sensor in the traction amplifier
indicates that the temperature has reached a level
which may damage components.
TRACTION system shutdown.
Criteria
Resulting Effect
LEFT/RIGHT TRACTION CONTROL OVERHEATED
Fault condition
E55L
E55L
E55R
E55R
Inspect brush indicator wire and repair.
Brush indicator wire shorted to 36V.
Replace all left/right traction motor brushes.
Left/right traction motor brushes are worn.
Solution
Possible Cause
Indicator sensor in brush is worn and has 36 volts
from armature.
SPEED limited.
Criteria
Resulting Effect
LEFT/RIGHT MOTOR BRUSH WEAR FAILURE
Fault condition
E61L
E61L
E61R
E61R
Replace traction motor.
Bad traction motor (shorted winding).
Replace traction amplifier.
Bad traction amplifier.
Check cables, repair or replace.
Shorted F1 or F2 cable from traction amplifier to
traction motor.
PERFORM OUTPUT TEST 17 or 18 - TRACTION MOTOR FIELD & ARMATURE CURRENT. Should
see Field amps 25-36 and armature amps 40-70 with truck jacked up. Test both forward and reverse.
Left and right field current should not differ by more than 5 amps.
Solution
Possible Cause
The traction motor field current draw is greater than
the system controller expects.
TRACTION system shutdown. Will not pass
POST.
Criteria
Resulting Effect
LEFT/RIGHT TRACTION MOTOR FIELD CURRENT HIGH
Fault condition
E62L
E62L
E62r
E62r
E
lectric
C
ounterbalance
H
igh
O
utput
Troubleshooting
REV 12/5/99
TS.12
