Panasonic VF200, Instruction Manual

Page: 129 / 289

10. Maintenance and Inspection
1
22
10.1 Safety Precautions
Wait at least five minutes after turning off the input
power before starting maintenance and inspection
work.
Failure to do so may result in an electric shock.
Maintenance, inspection and part replacement work
must be done only by qualified persons.
(Remove metal articles such as watch, bracelet(s) etc.
before operation.)
(Please use insulated tools.)
Failure to do so may result in an electric shock or injury.
Employ an electrical engineering company to
periodically tighten the terminal screws.
Loose terminal screws could lead to overheating or fire.
10.2 Precautions on Inspection
y
To measure the insulation resistance between power supply cable and motor
cable with megger, always disconnect the wires connected to the inverter first
before measuring. Do not make such measurement on the control circuit.
y
The inverter is mainly consisted of semiconductor elements. To prevent the
negative effects arising from temperature, humidity, dust and vibration etc. in
working environment and malfunctions caused by components’ aging and
service life, please perform daily inspection.
The following table shows the standard replacement interval (years) under
normal working conditions (average annual ambient temperature = 30°C, load
factor < 80% and average daily operation period < 12 h).
10.3 Inspection Items
1. Daily inspection: To check if abnormality occurs during operation.