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