Failure Code [D1Eqky] (Ladder Operation Alarm Relay Output Hot Short Circuit) - Komatsu WA900-3E0 Shop Manual

Troubleshooting by failure code

Failure code [D1EQKY] (Ladder operation alarm relay output hot short circuit)

Failure code [D1EQKY] (Ladder operation alarm relay output hot short
circuit)
Action level Failure code
E01 D1EQKY
Detail of failure Controller detects hot short circuit while driving ladder alarm relay.
q
Action of con-
Stops driving external alarm relay until its power supply is turned off.
q
troller
Problem on
Ladder alarm does not sound while ladder is being operated.
q
machine
Related infor- Output signal to ladder alarm relay can be checked with monitoring function.
q
mation Code: 40990 "D-OUT-2" (ON: 1, OFF: 0)
No. Cause
Short circuit in wiring harness
1
(short to another circuit)
2 Defective ladder alarm relay
3 Defective power ladder controller
40-16
Failure Hot short circuit in ladder alarm relay
Procedure, measuring location, criteria and remarks
1. Turn starting switch to OFF position.
2. Disconnect PC0 and PL14.
Between PC0 (female) (7) and (40)
Resistance
Between PC0 (female) (7) and ground
1. Turn starting switch to OFF position.
2. Disconnect PL13.
Between PL14 (male) (1) and (2)
Between ground and each of PL14 (male) (3), (5)
Resistance
and (2)
Between ground and each of PL14 (male) (1), (2)
If no failure is found by check on causes 1 and 2, power ladder controller may
be defective. (Since this is an internal defect, troubleshooting cannot be per-
formed.)
4 0 - 1 6
Min. 1 Mz
Min. 1 Mz
200 to 400 z
Min. 1 Mz
Min. 1 Mz
WA900-3E0