30 PC800, 850-8
SEN00792-02 40 Troubleshooting
Failure code [DW45KA] Swing Brake Sol. Disc.
Action code Failure code
Trouble
Swing Brake Sol. Disc.
(Pump controller system)
E03 DW45KA
Contents of
trouble
• No current flows at output to swing brake solenoid circuit.
Action of
controller
• None in particular. (Since no current flows, solenoid does not operate.)
• If cause of failure disappears, system resets itself.
Problem that
appears on
machine
• Machine cannot swing (The swing holding brake cannot be released).
Related
information
• Operating condition of swing brake solenoid (ON/OFF) can be checked with monitoring function.
(Code 02300: Solenoid 1)
• If solenoid and wiring harness are normal, operator can swing machine by setting emergency swing brake
release switch in release position (Swing holding brake does not work, however, when machine stops).
• Keep the swing lock switch in the OFF position and the swing holding brake release switch in the
RELEASE position during troubleshooting.
• Since the controller detects disconnection while the solenoid output is turned ON, be sure to turn the
solenoid output ON when checking the solenoid again after repairing it. (For how to turn power ON or
OFF, refer to the troubleshooting under failure code [DW45KB].)
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Defective swing holding
brake solenoid (Internal dis-
connection)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
V05A, V05B (male) Resistance
Between (2) – (1) 20 – 60 z
2
Defective assembled-type
diode D01
(Internal disconnection)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
D01 (male) Digital circuit tester Continuity
Between (7) – (3) Diode mode There is continuity
3
Defective swing lock switch
(Internal disconnection)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
S04 (female) Switch Resistance
Between (3) – (4)
OFF Max. 1 z
LOCK (ON) Min. 1 Mz
4
Disconnection in wiring har-
ness
(Disconnection in wiring or
defective contact in connec-
tor)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Wiring harness between CP03 (female) (37) –
D01 (female) (7)
Resistance Max. 1 z
Wiring harness between D01 (female) (3) – J04 –
S04 (male) (3)
Resistance Max. 1 z
Wiring harness between S04 (female) (4) – J22 –
V05A (female) (2) – V05B (female) (2)
Resistance Max. 1 z
Wiring harness between V05A (female) (1) –
V05B (female) (1) – J28 – CP03 (female) (3),
(13), (23)
Resistance Max. 1 z
5
Hot short (Short circuit with
24V circuit) in wiring har-
ness
aPrepare with starting switch OFF, then turn starting switch ON and
carry out troubleshooting.
Wiring harness between CP03 (female) (37) –
D01 – female (7) and chassis ground
Voltage Max. 1 V
6 Defective pump controller
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
CP03 (female) Disconnect D01 and
connect pins (3) and
(7) on female side
directly.
Resistance
Between (37) –
chassis ground
20 – 60 z
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