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Hitachi SRL Series Instruction Manual page 34

Oilfree scroll compressor
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Troubleshooting (continued)
Digital Display Error and Alarm Indications (Default function)
Digital Display
Display
Error/Alarm Description
High ambient temperature
A.THI
alarm
Maintenance alarm
A.nnT
Scroll head maintenance
alarm
A.OH
Overhaul alarm
E.CPU
Microcomputer error
Air compressor high pressure
E.Pr.H
error
E.Pr.S
Pressure sensor error
Air compressor high pressure
E.Pr.E
emergency stop error
Phase reversal error
E.rE
Damage to reversal phase
wiring
̲
Upper main motor thermal
E.Co.
overload error
̲
Middle main motor thermal
E.Co.
overload error
Lower main motor thermal
̲
E.Co.
overload error
̲ ̲
A l l m a i n m o t o r s t h e r m a l
E.Co.
overload error (7.5/11M6)
̲ ̲
A l l m a i n m o t o r s t h e r m a l
̲
E.Co.
overload error (16.5M6)
High ambient temperature
E.TP.A
error
̲
U p p e r s c r o l l h e a d h i g h
E.TP.
temperature error
Verify that the ambient temperature is below 104
°
F and reset the air compressor. If the error re-
occurs and the ambient temperature is below 104
° F, contact the local Hitachi distributor.
This alarm is displayed when the total operating
hours exceeds 2,500 hours. Carry out inspection
and maintenance of the air compressor.
This alarm is displayed when the total operating
hours exceeds 9,500 hours (145PSIG Model
: 4 , 5 0 0 h o u r s ) . C a r r y o u t i n s p e c t i o n a n d
maintenance of the scroll head.
This alarm is displayed when the total operating
hours exceeds between 19,000 to 19,500 hours
(145PSIG Model : between 9,000 to 9,500
hours). Carry out overhaul of the Scroll Head.
Turn off the main power supply to reset the air
compressor and turn the power back on. If the
error re-occurs, replace the Printed Circuit Board.
(Contact the local Hitachi distributor.)
The Electromagnetic Contactor, Printed Circuit
Board, Pressure Sensor or another electrical
component has failed. Contact the local Hitachi
distributor.
Tighten the pressure sensor wire and reset the
air compressor. If the error re-occurs, replace the
pressure sensor (Please contact the local Hitachi
distributor).
The Printed Circuit Board has failed. Contact the
local Hitachi distributor to replace the Printed
Circuit Board.
Change two of the three incoming power cables.
Confirm that there is no disconnection or damage
to the phase reversal wiring. If the error re-occurs,
contact the local Hitachi distributor.
Please contact the local Hitachi distributor to
eliminate the probable cause and reset the main
motor thermal overload error.
Verify that the ambient temperature is below 104
°
F. Turn off the main power supply to reset the
air compressor and turn the power back on. If
the error re-occurs and the ambient temperature
is below 104
distributor.
30
Corrective Action
° F, contact the local Hitachi

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