Hitachi HISCREW V PLUS NEXT Series - Non-Display Shutdowns Troubleshooting; Diagnosing Unindicated Shutdowns

5.3 A List of SHUTDOWNS Not Displayed on Instrument Panel
Ask your dealer or Hitachi regional office if the cause of malfunction is unknown or with mark shown in a
REMARKS column.
SYMPTOMS AND
TROUBLES
POSSIBLE CAUSES SOLUTIONS REMARKS
Unit doesn’t start
Motor noise
inaudible
Wire breaking Replace of wire
Print Circuit Board, relays, failures, fuse
blown-out, transformer failure.
Replace
Motor malfunction Repair or replace
Motor noise
audible
Voltage drop
Change transformer capacity when POWER
CAPACITY too small
Wires too thin Replace wires to ones of standard size
Motor abnormal Repair or replace
Compressor's revolution unable
Disassemble and inspection of the Com-
pressor Main Body
Discharge air
Pressure
decreased
Blow-off Solenoid Valve fault Readjust or replace
Pressure Gauge indication fault Replace
Leak in pipes Refastening/Packing and O-ring change
Intake Filter clogging Clean or replace element
Oil Separator clogging Replace element
Discharge air
Pressure
increased
Suction Throttle Valve fault Disassemble and check/O-ring change
Mechanical Sealing damage Replace
Pressure Gauge indication fault Replace
Relief Valve
operated
Excess Over Rated Pressure
See “Discharge air pressure increased” above
Relief Valve: Incorrectly adjusted or failed. Readjust, repair or replace
Discharge air
Temp.
too high
Faulty operation of cooling fan inverter Replace
Suction Air Temperature too high More ventilation
Poor operation of Oil Temperature Control Valve Replace
Lubricant
consumption
excessive
Oil Scavenge Pipe System clogging Clean or replace recovery orifi ce
Oil Separator clogging Replace element
Oil level: Not between the red lines on oil
level gauge.
Keep oil level between the red lines.
Other phenomena*
Current value
large
Lowered or unbalanced voltage Adjustment of power and voltage
Abnormal abrasive resistance in the rotating
part (oil deterioration, seizure)
Inspection, blinking, oil change
Current value
small
Unload setting is low. Readjustment
Intake Filter clogging Clean or replace element
Over-voltage Adjustment of power and voltage
To be continued on page 28.
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5. TROUBLESHOOTING [A List of SHUTDOWNS Not Displayed on Instrument Panel]