Check 15 amp fuse on main harness, wiring on all
hydraulic valve coils, repair or replace.
If error codes 29-42 occur at the same time; J4
pin 3 not connected to switched B+.
Replace system controller field fix.
Malfunction of the main power contactor coil
driver.
Replace main power contactor.
Main contactor coil is open or shorted internally.
Check and repair damaged wires to the contactor.
Test resistance from B+ to J4 pin 9 for 28 ohms.
Measure B+ and B- on coil.
Broken or shorted wiring to the contactor.
PERFORM OUTPUT TEST 01 - MAIN POWER CONTACTOR.
Solution
Possible Cause
The main power contactor coil circuit is overheated,
shorted to supply, shorted to ground, or
disconnected.
TOTAL shutdown.
Criteria
Resulting Effect
MAIN POWER CONTACTOR WIRING FAULT
Fault condition
E27A
E27A
Inspect contactor tips and remove foreign material.
Conductive material between contactor tips.
Replace main power contactor.
Binding of the contactor solenoid shaft.
Replace contactor tips.
Contactor tips have been allowed to deteriorate,
causing them to become welded. Check for
movement of contactor tips.
PERFORM OUTPUT TEST 01 - MAIN POWER CONTACTOR.
Solution
Possible Cause
System controller senses current at both amplifier
fields during POST indicating that Main Power
Contactor is closed.
TOTAL shutdown.
Criteria
Resulting Effect
MAIN POWER CONTACTOR WELDED
Fault condition
E27E
E27E
E
lectric
C
ounterbalance
H
igh
O
utput
Troubleshooting
REV 12/5/99
TS.5
