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Troubleshooting Of Air Compressor - Hitachi NEXT Series Instruction Manual

Oil-free rotary screw air compressor
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4. TROUBLESHOOTING [Troubleshooting of Air Compressor]
4.2

4.2 Troubleshooting of Air Compressor

■ Most common problems, causes and corrective actions are described below.
Phenomenon
LCD indication example
NOT start
< P R O B L E M >
C O N N E C T I O N E R R :
P r e s s
< P R O B L E M >
C O N N E C T I O N E R R : O P E N
P r e s s
Shutdown -
< S H U T D O W N >
1st stage
discharge air
H I G H D I S . T E M P . 1 :
temperature or
P r e s s
interstage pressure
< S H U T D O W N >
I N T S T G . P :
P r e s s
Shutdown –
< S H U T D O W N >
2nd stage
discharge air
D I S . T E M P . 2 :
temperature
P r e s s
Shutdown –
< S H U T D O W N >
2nd stage suction
air temperature
H I G H D I S . T E M P . 2 :
P r e s s
Shutdown –
< S H U T D O W N >
Oil temperature
O I L :
P r e s s
Shutdown –
< S H U T D O W N >
Oil pressure
O I L :
P r e s s
Shutdown –
< S H U T D O W N >
Motors overload
OVERLOAD :
P r e s s
< S H U T D O W N >
O V E R L O A D :
P r e s s
[Water-cooled type] [Vtype]
< S H U T D O W N >
C O N T A C T O R E R R :
P r e s s
Shutdown –
< F A I L U R E >
Inverter
S Y S T E M R E T R Y :
38
1. Power supply switch - OFF.
2. Power – Failed, or power source
voltage - Low.
R E V
3. Power cable - In a reversal phase
R E S
a f t e r C H K .
connection.
4. Power cable - In a phase-lacking
connection.
(Note) See Note (2) in previous
page.
R E S
a f t e r C H K .
1. 2nd-stage AIR END air intake
effi ciency - Lowered
2. Air intake fi lter - Dirty
3. Temperature of Suction Air-High
R E S
a f t e r C H K .
R E S
a f t e r C H K .
1. Check valve – Compressed air
leaked (from the aftercooler to
the air end when unloading)
2. Suction throttle valve - Dirty
R E S
a f t e r C H K .
[Fixed speed type]
1. Cooling water pump – failed, or
cooling water temp. – Fluctuating
(Water-cooled model)
2. Intercooler – Dirty
R E S
a f t e r C H K .
1. Oil cooler – Dirty
2. Room temperature – High
3. Oil temperature control valve –
H I G H T E M P
Failed
R E S
a f t e r C H K .
1. Oil strainer and/or oil fi lter – Dirty
2. Oil level – Low
OIL LOW PRESS
R E S
a f t e r C H K .
1. Power supply voltage – Low
2. Discharge air pressure – Too high
3. Power supply - Imbalance
MAIN
4. Motor Insulation - Failure
R E S
a f t e r C H K .
1. Power supply voltage – Low
2. Cooling fan motor – Failed
3. Power supply - Imbalance
S U B
4. Motor Insulation - Failure
R E S
a f t e r C H K .
5 2
R E S
a f t e r C H K .
1. Power supply voltage – Low or in
unbalance
2. Discharge air pressure – Too high
3. Main motor – Overloading
NOTE: 4th retry action in ten minutes
Cause
becomes shutdown failure.
Corrective remedies
1. Check the power supply switch.
2. Check the power supply.
3. Change 2 of 3 wires of the power
cord.
4. Reconnect the power cord tightly and
check the power supply.
NOTE: Phase-lacking is detectable only
when connecting the power.
1. Clean or change the air intake fi lter
2. Lower the suction air temperature
1. Replace the check valve.
2. Clean the Suction throttle valve.
[Fixed speed type]
Note: For information about the Suction
bypass valve,
3.7)
1. Check the cooling water system
(Water-cooled model).
2. Clean the intercooler
1. Check the oil cooler.
2. Lower the room temperature.
3. Check the oil temperature control
valve.
1. Clean the oil strainer
2. Replace the oil fi lter.
3. Add the oil.
1. Rectify the power supply voltage.
2. Check the suction throttle valve
[Fixed speed type]
3. Check the capacity control system.
4. Check the insulation resistance.
1. Rectify the power supply voltage.
2. Check the cooling fan motor.
(Measure insulation resistance etc.)
1. Rectify the power supply voltage.
2. Check the capacity control system.
3. Measure insulation resistance etc. or
check the main motor.

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