Doosan 25/300, Electronic Service Manual

Page: 87 / 119

79
( )
Book No. 22772784 (9--8--06)
HP1300/1600WCU Electrical Manual
CHART D1
CIRCUIT TROUBLESHOOTING
CIRCUIT DESCRIPTION
RT2 AIREND DISCHARGE TEMP
J1--5
W1 P1--5
YEL
1
2
BRN
W1 P1--6
J1--6
RT2
AIREND DISCHARGE
TEMP SENSOR
Airend discharge temperature is read by RT2 thermistor. It is mounted in the airend
discharge piping and connects to the W1 harness. The temperature range is --30 to
255
_
F.
If the WEDGE Controller has an incorrect reading for the RT2 channel, disconnect the
thermistor and install the Thermistor Simulator Plug (
PN
22073878) into the harness
connector. Read the channel again and it should read 32 degrees F
±
5 degrees
(0C
±
3C). If the reading is correct, replace the thermistor. If not, disconnect the
WEDGE Controller P1 connector. Connect an ohmmeter between pins P1--5 and
P1--6. The ohmmeter should read 33.2K ohms
±
1%. If the reading is correct, replace
the WEDGE Controller. If not, there is a problem with the W1 harness or the P1--5,
P1--6 connector pins.
W1 W096
W1 W097
WEDGE
CONTROLLER
WEDGE
CONTROLLER
--20 --4 25,490
--10 14 18,088
--5 23 12,221
0 32 9,369
5 41 7,240
15 59 4,427
25 77 2,786
40 104 1460
60 140 668.7
70 158 467.2
90 194 241.0
100 212 177.5
105 221 153.1
110 230 132.8
Temp
_
C Temp
_
F
Resistance
(Ohms)