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M-1
Danger
Mandatory
Be sure to inspect the inverter regularly.
If the inverter is used without regular inspection, it may cause trouble or accident because
sign of disorder or failure is missed.
Complete the following steps before proceeding to inspection.
1 Cut off power supply (turn off the inverter).
2 10 minutes or more after power cutoff, check to see if the charge indicator lamp is turned
off.
3 Make sure that voltage in the DC main circuit (between PA and PC) is 45 V or lower by
use of a tester capable of measuring high DC tension (800 V DC or more).
If the above-mentioned steps are skipped before inspection, it may cause an electricshock.
To prevent the inverter from failure caused by operating environment such as influence of
temperature, humidity, dust and so on, vibration, and aging of component parts, and end of
estimated service life, execute daily or regular inspection without fail.
13.1 Regular inspection
Since electronic parts are easily affected by heat, install the inverter in a cool, well-ventilated,
dust-free place for making it demonstrate its original performance for a long time.
Purpose of regular inspection is to find sign of failure or malfunction by comparing current data
on operation with recorded data on past operation.
Gist of inspection
Subject of
inspection
Inspection item
Inspection cycle
Inspection method
Criteria of judgment
1. Indoor
environment
1) Dust,
humidity, gas
2) Dropping of
water and
other liquid
3) Room
temperature
1) Eye-check,
thermometer,
sense of smell
2) Eye-check
3) Thermometer
1) Improve bad points.
2) Pay heed to trace left of
water drop.
3) Maximum 40°C (50°C inside
cabinet)
2. Component
parts and
units
1) Vibration,
noise
By feel (touch) of
outside of the
board
If something feels abnormal, open the
door and check transformer, reactor,
contactor, relay, cooling fan, etc.
Stop the inverter as occasion
demands.
3. Operation
data (output
side)
1) Load current
2) Voltage*
3) Temperature
As occasion
demands
Moving-iron type
AC ammeter
Rectifier type AC
voltmeter
Thermometer
Within the rating
Little difference from data on
normal status
Voltage is differently read depending on the measuring instrument used. Use the same tester
or voltmeter for every inspection and record measurement result each time.
Check points
1. Something unusual in the installation environment
2. Something unusual in the cooling system
3. Unusual vibration and noise
4. Overheat, discoloration
5. Unusual smell
6. Unusual motor vibration, noise and overheat
13. Regular inspection and maintenance