Mitsubishi Electric FR-A800, Instruction Manual

Page: 935 / 1042

Precautions for maintenance and inspection Inspection item
FR-A800 7 - 1
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.
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. Clean the air filter, etc.
●
Check the tightening and retighten. 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 2-29.)
●
Check the conductors and insulating materials for corrosion and damage.
●
Measure the insulation resistance.
●
Check and change the cooling fan and relay.
P
WARNING:
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.