Precautions For Maintenance And Inspection; Inspection Item; Daily Inspection; Periodic Inspection - Mitsubishi Electric FR-F820-00077 Instruction Manual

Precautions for maintenance and inspection

7 Precautions for maintenance and
inspection
The inverter is a static unit mainly consisting of semiconductor devices. Daily inspection must be per-
formed 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.
WARNING:
P
The bus capacitor discharge time is 10 minutes. Before starting wiring or inspection, switch
power off, wait for more than 10 minutes, and then make sure that the voltage across the main
circuit terminals P/+ and N/- of the inverter is not more than 30 VDC using a tester, etc., to avoid
a hazard of electrical shock.
7.1

Inspection item

7.1.1

Daily inspection

Basically, check for the following faults during operation.
● Motor operation fault
● Improper installation environment
● Cooling system fault
● Abnormal vibration, abnormal noise
● Abnormal overheat, discoloration
7.1.2

Periodic inspection

Check the areas inaccessible during operation and requiring periodic inspection.
Consult us for periodic inspection.
● Check and clean the cooling system.
● Check the tightening and retighten.
● Check the conductors and insulating materials for corrosion and damage.
● Measure the insulation resistance.
● Check and change the cooling fan and relay.
FR-F800
Clean the air filter, etc.
The screws and bolts may become loose due to
vibration, temperature changes, etc.
Check and tighten them.
Tighten them according to the specified tighten-
ing torque. (Refer to page 2-37.)
Inspection item
7 - 1