28
U
Maintenance and Inspection
6.1 Safety Precautions
Danger
Wait at least five minutes after turning off the input power before
starting the maintenance and inspection work.
Failure to do so may result in 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 electric shock or injury.
Do not replace the cooling fan when power is ON. Failure to do
so may result in electric shock
Caution
Employ an electrical engineering company to periodically
tighten the terminal screws.
Loose terminal screws could lead to overheating or fire.
6.2 Precautions on Inspection
· To measure the insulation resistance between the power supply cable and the motor
cable with a megger, always disconnect the wires connected to the inverter first
before measuring. Do not make such measurement on the control circuit.
· The inverter is mainly consisted of semiconductor elements. To prevent the negative
effects arising from the temperature, humidity, dust and vibration etc. in working
environment and the 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
℃
, load factor < 80% and average daily operation period < 12 h).
6.3 Inspection Items
1. Daily inspection: Basically check if abnormality occurs during operation. A multimeter
is normally used to check the input and output voltages of the
inverter during operation.
2. Periodic inspection: To check all locations where inspection can be performed only
when the inverter is stopped and where periodic inspection is
required.
Summary of Contents for AMK3000114
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