5 - 24
Section C
Electrics
9803/6400
Section C
5 - 24
Issue 1
Pump Control
Power Transistor Protection
If a solenoid valve or relay is shorted, it stops the output of a power transistor, in order to protect the controller. 'Electric system
abnormality' is indicated at this time in message display. By performing a self check, the position of the abnormality is indicated.
Check wiring and components of the relevant circuit.
Position
8
7
6
5
4
3
2
1
16
15
14
13
12
11
10
9
20
19
18
17
Spare
Spare
Spare
Swing shut off solenoid V
Lever lock solenoid V
Travel alarm
Pressure raising solenoid V
Free swing solenoid V
Negative control solenoid V
Spare
Spare
Soft/Hard change solenoid V
Max. flow cut solenoid V
Swing lock solenoid V
Warning lamp
Boom lowering speed regulation solenoid V
Travel 2-speed change solenoid V
Swing brake solenoid V
Heating relay
Battery relay
Controller
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