Precautions For Maintenance And Inspection - Mitsubishi Electric FR-D700 Series Instruction Manual

9 PRECAUTIONS FOR MAINTENANCE AND INSPECTION

The inverter is a static unit mainly consisting of semiconductor devices. Daily inspection must be performed to prevent any
fault from occurring due to the adverse effects of the operating environment, such as temperature, humidity, dust, dirt and
vibration, changes in the parts with time, service life, and other factors.
REMARKS
 For maintenance/inspection and parts life, also
Precautions for maintenance and inspection
For some short time after the power is switched OFF, a high voltage remains in the smoothing capacitor. When accessing the
inverter for inspection, wait for at least 10 minutes after the power supply has been switched OFF, and then make sure that
the voltage across the main circuit terminals P/+ and N/- of the inverter is not more than 30VDC using a tester, etc.
9.1 Inspection items
Area of Inspection
Inspection Item
Surrounding Check the surrounding air temperature, humidity,
environment dirt, corrosive gas, oil mist, etc.
Check for unusual vibration and noise.
General
Overall unit
Check for dirt, oil, and other foreign material.
Power supply Check that the main circuit voltages are
voltage normal.
(1) Check with megger (across main circuit
(2) Check for loose screws and bolts.
General
(3) Check for overheat traces on parts.
(4) Check for stains.
(1) Check conductors for distortion.
Conductors,
(2) Check cable sheaths for breakage and
cables
Main circuit
Terminal
Check for damage.
block
(1) Check for liquid leakage.
Smoothing
(2) Check for safety valve projection and bulge.
aluminum
(3) Visual check and judge by the life check of
electrolytic
capacitor
Check that the operation is normal and no chatter
Relay
is heard.
(1) Check that the output voltages across phases
Operation
(2) Check that no fault is found in protective and
check
Control
(1) Check for unusual odors and discoloration.
circuit,
Overall
Protective
(2) Check for serious rust development
circuit
(1) Check for liquid leakage in a capacitor and
Aluminum
electrolytic
(2) Visual check and judge by the life check of
capacitor
(1) Check for unusual vibration and noise.
Cooling fan (2) Check for loose screws and bolts
Cooling
(3) Check for stains.
system
(1) Check for clogging
Heatsink
(2) Check for stains.
(1) Check that display is normal.
Indication
(2) Check for stains.
Display
Meter Check that reading is normal
Description
terminals and earth (ground) terminal).
deterioration (crack, discoloration, etc.)
the main circuit capacitor ( Refer to
Chapter 4 of the Instruction Manual (Applied).)
with the inverter operated alone is balanced
display circuits in a sequence protective
operation test.
deformation trace
the main circuit capacitor ( Refer to
Chapter 4 of the Instruction Manual (Applied).)
refer to the Instruction Manual (Applied).
Interval
Corrective Action at Alarm
Periodic
Daily


Improve environment.

Check alarm location and retighten.

Clean.

Inspect the power supply.

Contact the manufacturer.

Retighten.

Contact the manufacturer.

Clean.

Contact the manufacturer.

Contact the manufacturer.
Stop the device and contact the

manufacturer.

Contact the manufacturer.

Contact the manufacturer.


Contact the manufacturer.

Contact the manufacturer.

Contact the manufacturer.
Stop the device and contact the

manufacturer.

Contact the manufacturer.

Contact the manufacturer.


Replace the fan.

Fix with the fan cover fixing screws.

Clean.

Clean.

Clean.

Contact the manufacturer.

Clean.
Stop the device and contact the

manufacturer.
Inspection items
Customer's
Occurrence Check
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