AirMan PDS185S-6C1, Service Manual

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3. Electric System
3-8
PC08031E
4.Function of control output relay
Mark Name Remark
RY1 Stop signal relay It switches “OFF” when emergency stop device functions.
RY2 Operation signal relay
After alternator generating signal is inputted, it switches “OFF”.
(It prevents overrun of starter motor and plunging of pinion
gear.)
RY3
Purge/starting unloader
relay
It switches “ON” when starter switch is ON. 10 seconds after
engine starts (inputting alternator generating signal), it switches
“OFF”. On purge control unload operation, it switches “ON”.
5.Adjustment and inspection
Confirm detection of rise of discharge air temperature/engine coolant temperature by controller and
adjustment of purge control setting knob (VR1-VR3) should be performed in accordance with following
procedure.
(1)Check and confirm resistance for detecting rise of discharge air temperature (CN2-2) and of coolant
temperature (CN2-11).
1) Connect resistance to controller as shown right. Or use
multi-speed variable resistance (resistance value: 1.0k Ω )
for VRc1 and VRc2.
2) Gradually lower resistance values of VRc1 and VRc2 and measure them when they reach abnormal
values. Then check and confirm that they are within the following ranges.
Set temperature
Item
℃ ﾟ
F
Resistance
115
℃
239
ﾟ
F 491
±
15
Ω
Discharge air temperature VRc1
120
℃
248
ﾟ
F 432
±
15
Ω
107
℃
225
ﾟ
F 608
±
15
Ω
Engine water temperature VRc2
110
℃
230
ﾟ
F 560
±
15
Ω
(2)Adjustment of purge control setting knob (VR1-VR3)
1) Keep pushing indication selector switch (SW1) for 5 seconds.
2) Flickering of P Setting purge releasing pressure (VR3) to
0.55[MPa].
SW1 ON
3) Flickering of C Setting purge starting intake negative pressure (VR2) to 30[
％
].
SW1 ON
4) Flickering of T Setting purge timer (VR1) to 10 sec.
SW1 ON
Returning to discharge air temperature table.
PC08030E
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