Be sure to follow the measures below if the compressor is stored or stopped by reason of
power supply problem for a long time. (Follow
○
marked items)
Procedure for Long Time Stoppage and Storing
Measures
Criteria
Measures If Criteria Is Not Filled
Storage Period
3 to 6 months 6 to 12 months
Measures
Before
Storing
R e m o v e co nd en sate f ro m O il
Separator Tank’s drain port.
(After stop, take out condensate one day later and do not
drain the lubricant.
○
Special
anti-rusting
measures
are
required.
Ask your
dealer or
Hitachi
regional
office for
information.
Measures
Before
Restarting
Measure insulation resistance
between each phase of the motor.
More than 1M ohm at
DC 500V Mega.
To recover its insulation capacity,
or replace the motor. (NOTE)
○
Rotate manually to check compres-
sor (screw block)’s rotation.
Smooth rotation.
Disassemble and check the com-
pressor (screw block) (NOTE).
○
Grease the motor bearings.
○
Replace the lubricant.
Replace in whole.
○
Check power cables and terminals
for deterioration or rusting.
No deterioration nor
rusting.
Replace it with new one.
○
(NOTE) Ask your dealer or Hitachi regional office for information.
●
The compressor air end (screw block) can have rustings if no anti-rusting measure (Measures before
storing, sealing) are done to it. If the unit is restarted, this may result breakage in locks or bearings of
the compressor.
●
Neglecting the above procedures before restarting will result in the lock of air end rotors, the damag-
es to bearings, and/or the motor burning.
●
If lubricant has not been replaced when necessary or if enough flashing has not been done to the
unit, the lubricant deteriorates earlier than usual and this may result clogging in lock and Oil Cooler to
the compressor.
CAUTION
55
9. WHEN IT IS NOT USED FOR LONG TIME
