Maintenance And Inspection; Inspection; Daily Inspection; Periodic Inspection - Mitsubishi Electric FR-F740 EC Instruction Manual

Maintenance and inspection

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.
WARNING:
P
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. The LED indicator and the CHARGE LED inside the unit must both be off.
8.1

Inspection

8.1.1

Daily inspection

Basically, check for the following faults during operation:
● Motor operation fault
● Improper installation environment
● Cooling system fault
● Unusual vibration and noise
● Unusual overheat and discoloration
8.1.2

Periodic inspection

Check the areas inaccessible during operation and requiring periodic inspection.
Consult your Mitsubishi dealer 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
● Check the conductors and insulating materials for corrosion and damage.
● Measure insulation resistance.
● Check and change the cooling fan and relay.
FR-F700 EC
vibration, temperature changes, etc.
Tighten them according to the specified tighten-
ing torque. (Refer to page 3-11.)
Inspection
8 - 1