Hitachi NEXT Series User Manual

40
4. TROUBLESHOOTING [Troubleshooting of Air Compressor]
4.2 Troubleshooting of Air Compressor
■ Most common problems, causes and corrective actions are described below.
Phenomenon LCD indication example Cause Corrective remedies
NOT start
＜P R O B L E M＞
CONNECTION ERR： REV
Press
RES
after CHK.
1. Power supply switch - OFF.
2. Power – Failed, or power source
voltage - Low.
3. Power cable - In a reversal phase
connection.
4. Power cable - In a phase-lacking
connection.
(Note) See Note (3) (
4.1)
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.
＜P R O B L E M＞
CONNECTION ERR： OPEN
Press
RES
after CHK.
Shutdown -
1st stage
discharge air
temperature or
interstage pressure
＜S H U T D O W N＞
HIGH DIS. TEMP. 1：
Press
RES
after CHK.
1. 2nd-stage AIR END air intake
effi ciency - Lowered
2. Air intake fi lter - Dirty
3. Temperature of Suction Air-High
1. Clean or change the air intake fi lter
2. Lower the suction air temperature
＜S H U T D O W N＞
INTSTG. P：
Press
RES
after CHK.
Shutdown –
2nd stage
discharge air
temperature
＜S H U T D O W N＞
DIS. TEMP.2：
Press
RES
after CHK.
1. Check valve – Compressed air
leaked (from the aftercooler to
the air end when unloading)
2. Suction throttle valve - Dirty
[Fixed speed type]
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)
Shutdown –
2nd stage suction
air temperature
＜S H U T D O W N＞
HIGH DIS. TEMP. 2：
Press
RES
after CHK.
1. Cooling water pump – failed, or
cooling water temp. – Fluctuating
(Water-cooled type)
2. Intercooler – Dirty
1. Check the cooling water system
(Water-cooled type).
2. Clean the intercooler
Shutdown –
Oil temperature
＜S H U T D O W N＞
OIL ： HIGH TEMP
Press
RES
after CHK.
1. Oil cooler – Dirty
2. Room temperature – High
3. Oil temperature control valve –
Failed
1. Check the oil cooler.
2. Lower the room temperature.
3. Check the oil temperature control
valve.
Shutdown –
Oil pressure
＜S H U T D O W N＞
OIL ： OIL LOW PRESS
Press
RES
after CHK.
1. Oil strainer and/or oil fi lter – Dirty
2. Oil level – Low
1. Clean the oil strainer
2. Replace the oil fi lter.
3. Add the oil.
Shutdown –
Motors overload
＜S H U T D O W N＞
OVERLOAD ： MAIN
Press
RES
after CHK.
1. Power supply voltage – Low
2. Discharge air pressure – Too high
3. Power supply - Imbalance
4. Motor Insulation - Failure
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.
＜S H U T D O W N＞
OVERLOAD ： SUB
Press
RES
after CHK.
1. Power supply voltage – Low
2. Cooling fan motor – Failed
3. Power supply - Imbalance
4. Motor Insulation - Failure
1. Rectify the power supply voltage.
2. Check the cooling fan motor.
(Measure insulation resistance etc.)
[Water-cooled type] [Vtype]
＜S H U T D O W N＞
CONTACTOR ERR ： 52
Press
RES
after CHK.
Shutdown –
Controller retry
＜F A I L U R E＞
SYSTEM RETRY ：
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
becomes shutdown failure.
1. Rectify the power supply voltage.
2. Check the capacity control system.
3. Measure insulation resistance etc. or
check the main motor.

Hitachi NEXT Series Specifications

General

Brand	Hitachi
Model	NEXT Series
Category	Air Compressor
Language	English