Hitachi SJ300 - Manual (Page 30)

5- 1
5. Maintenance and Inspection
5.1 Maintenance and Inspection
5.1.1 Daily inspection
Main check points to be done while operation are as follows.
(1) Whether the motor rotates as expected.
(2) Whether the installation condition have no problem.
(3) Whether there is no problem in cooling.
(4) Whether there is any abnormal vibration and noise.
(5) Whether there is any abnormal temperature rising and change in color.
(6) Whether there is any abnormal smell.
Measure the input voltage of the inverter by a tester while operation to confirm the followings.
(1) No frequent voltage fluctuation.
(2) All line voltages are balanced and stable.
5.1.2 Cleaning
Always keep the inverter clean.
Use soft cloth dipped with neutrality detergent or ethanol and wipe the dirty portion with care.
(note) Do not use such as acetone, benzene, toluene or alcohol which may damage the coating of the
inverter.
5.1.3 Periodical inspection
Check the portions where the inverter must not be in operation.
Please contact HITACHI for a periodical inspection.
(1) Is there any abnormality in cooling? ---- Cleaning of air filter.
(2) Tightening check and additional tightening. ---- Loose tightening of the screws and bolts could occur
due to vibrations and/or temperature changing. Be
sure to confirm carefully.
(3) Isn’t there any corrosion or damage in the conductors?
(4) Measurement of insulation resistance.
(5) Check and replace of cooling fan, DC bus capacitors and relays if necessary.