Mitsubishi Electric FR-A820-00046 (0.4K), Instruction Manual

Page: 1092 / 1218

Inspection item Precautions for maintenance and inspection
7 - 2
7.1.3 Daily and periodic inspection
NOTE When using the safety stop function, periodic inspection is required to confirm that safety func-
tion of the safety system operates correctly.
For more details, refer to the Safety Stop Function Instruction Manual.
Area of in-
spection
Inspection item Description
Inspection
interval
Corrective action at
fault occurrence Check by
the user
Da
ily
Pe
ri
od
ic
General
Surrounding
environment Check the surrounding air temperature, humidity,
dirt, corrosive gas, oil mist, etc.
4
Improve the
environment.
Overall unit
Check for unusual vibration and noise.
4
Check fault location and
retighten.
Check for dirt, oil, and other foreign material.
4
Clean.
Power supply
voltage
Check that the main circuit voltages and control
voltages are normal.
4
Inspect the power
supply.
Main
circuit
General
(1) Check with megger (across main circuit
terminals and earth (ground) terminal).
4
Contact the
manufacturer.
(2) Check for loose screws and bolts.
4
Retighten.
(3) Check for overheat traces on the parts.
4
Contact the
manufacturer.
(4) Check for stain.
4
Clean.
Conductors, cables
(1) Check conductors for distortion.
4
Contact the
manufacturer.
(2) Check cable sheaths for breakage and
deterioration (crack, discoloration, etc.).
4
Contact the
manufacturer.
Transformer/reactor
Check for unusual odor and abnormal increase of
whining sound.
4
Stop the equipment and
contact the
manufacturer.
Terminal block Check for a damage.
4
Stop the equipment and
contact the
manufacturer.
Smoothing
aluminum
electrolytic capacitor
(1) Check for liquid leakage.
4
Contact the
manufacturer.
(2) Check for safety valve projection and bulge.
4
Contact the
manufacturer.
(3) Visual check and judge by the life check of the
main circuit capacitor. (Refer to page 7-6.)
4
Relay/contactor
Check that the operation is normal and no
chattering sound is heard.
4
Contact the
manufacturer.
Resistor
(1) Check for crack in resistor insulation.
4
Contact the
manufacturer.
(2) Check for a break in the cable.
4
Contact the
manufacturer.
Tab. 7-1: Daily and periodic inspection (1)