Doosan 25/300, Electronic Service Manual

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Book No. 22772784 (9--8--06)
HP1300/1600WCU Electrical Manual
CHART E1
CIRCUIT TROUBLESHOOTING
CIRCUIT DESCRIPTION
PT1
SEPARATOR TANK
PRESSURE TRANSDUCER
P1--8 BRN
P1--7 ORN
PT1 SEPARATOR TANK
PRESSURE CIRCUIT
J1--8
J1--7
J1--10
P1--10 VIO
A
C
B
5VDC+
SIG (+)
GND
The WEDGE reads separator tank pressure from PT1. It is a gauge pressure
transducer mounted on the separator tank. The WEDGE provides 5 VDC excitation
voltage to pin B (+5) and pin A (GND). The pressure signal on pin C connects to the
WEDGE input. The signal range is .45 to 4.5 volts. The transducer range is 0 to 225
psig.
To check the operation of PT1, connect a known correct gage in parallel with it.
Compare readings and if PT1 does not track the test gage, replace it. This test
should be performed from idle to loaded engine speeds. The test gauge used
should be at least 1% accuracy to match the accuracy of PT1.
WEDGE
CONTROLLER
W099
W098
W101
W1
HARNESS