Mitsubishi Electric FR-D720S SC EC, Instruction Manual

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Maintenance and inspection Inspection
FR-D700 SC EC 8 - 1
8 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 en-
vironment, such as temperature, humidity, dust, dirt and vibration, changes in the parts with
time, service life, and other factors.
8.1 Inspection
8.1.1 Daily inspection
Basically, check for the following faults during operation:
●
Motor operation fault
●
Improper installation environment
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Cooling system fault
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Unusual vibration and noise
●
Unusual overheat and discoloration
8.1.2 Periodic inspection
Check the areas inaccessible during operation and requiring periodic inspection. Consult the
nearest Mitsubishi FA Centre for periodic inspection.
●
Check for cooling system fault . . . . . . . . .Clean the air filter, etc.
●
Tightening check and retightening . . . . . .The screws and bolts may become loose due to
vibration, temperature changes, etc.
Tighten them according to the specified tighten-
ing torque. (Refer to page 3-8.)
●
Check the conductors and insulating materials for corrosion and damage.
●
Measure insulation resistance.
●
Check and change the cooling fan and relay.
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 “FR-D700 SC EC – Safety stop function instruction manual, doc-
ument no.: BCN-A211508-005".
m
WARNING:
Wait for a period of well over 10 minutes after disconnecting from the power supply
before performing any service work on the frequency inverter. This is necessary so
that the capacitors can discharge down to a save level (< 25V) after disconnection of
the mains power. Check the voltage across the main circuit terminals P/+ and N/– (+
and – respectively) of the inverter using a tester.