AirMan PDS185S-6C1, Руководство по обслуживанию

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4. Troubleshooting
4-15
4.5 Explanation of trouble diagnosis
No. Item Cause Remedy
1 Faulty unloader.
Unloader valve cannot be open. Disassemble unloader valve,
and check the function of valve
and piston. Further check
unloader orifice for any
clogging.
2 Check and confirm that
safety valve functions at
lower pressure than set
pressure for safety valve.
Check and locate pressure
maladjustment or defective
safety valve. In case of malfunction of safety
valve, safety valve assembly
should be replaced.
3 Faulty unloader.
Faulty seat of unloader valve or
faulty sliding function of valve
and piston. Disassemble unloader valve,
and clean seat surface and
check function of valve and
piston.
4 Check discharge air
temperature, using digital
monitor.
Check whether actual rise of
discharge air temperature stops
engine or any failure of
electrical circuit stops engine.
5 Check the resistance of
discharge air
temperature/coolant
temperature sensor.
For resistance characteristics of
discharge air temperature and
coolant temperature sensor, See
3.1.6. Engine could stop even due to
disconnection of thermo sensor
or thermo sensors short-circuit.
6 Check conductance
between controller and
discharge air temperature
sensor/coolant
temperature sensor.
Check whether there is any
disconnection or short-circuit in
cable connection between
controller, discharge air
temperature sensor and coolant
temperature sensor.
Clarify whether the trouble is
caused by faulty cable
connection or defective
controller. When discharge air
temperature/coolant
temperature exceeds the set
temperature 248°F/230°F (120
℃
/110
℃
), interior contact between
controller CN1-8 and CN1-4
terminals turns OFF to cut
electrical connection to stop
solenoid and making engine
stop.
How to check controller only is
shown as follows: Connect
variable resistor (1k
Ω
) to
controller as shown below.
Gradually lowering resistance
value, measure the value when
it begins to show abnormality
and check whether it is within
the ranges shown below.
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
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