Maeda MK0003, Service Manual, Page: 319 / 348

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2.8 MAINTENANCE AND INSPECTION
DANGER
Compulsory
- Perform daily check.
If maintenance and inspections are not performed, failures and damage cannot be found, which
may result in accidents.
- Perform the following steps before starting the inspection.
(1) Cutoff “OFF” the input power.
(2) Check that the charge lamp is off after 10 minutes has elapsed.
(3) Use a tester that is capable of measuring DC high voltage (more than DC 800V), and check
that the DC main circuit voltage (between PA–PC) is under 45V.
If this step is not performed before inspection, it may lead to an electrical shock.
Perform daily inspections and periodical inspections to avoid failure due to aging, life of parts and impact from
the environment such as temperature, humidity, dust, and vibration.
2.8.1 DAIRY INSPECTION
Electrical parts are weak against heat. In order to increase the life of the unit, place in an environment where dust
does not cumulate, and where the ambient temperature is low, and well ventilated.
The purpose of the daily inspection is to maintain the environment, and to discover operational abnormalities before
accidents occur by comparing operation data records.
Inspection target
Inspection procedure
Criterion
Check item Cycle Inspection method
1. Room environment
1) Dust, temperature,
gas
As required 1) Visual inspection,
thermometer,
olfaction
1) Improve areas of concern.
2) Dripping of water
and other liquid
As required 2) Visual inspection 2) Pay attention to scratches.
3) Room temperature As required 3) Thermometer 3) Maximum 60°C
2. Component and
parts
1) Vibration, noise As required Feeling of the box
external If abnormal, open the door, and
inspect the trance, reactor,
contactor, relay and cooling fan.
Stop the operation if necessary.
3. Operation data
(Output side)
1) Load current As required 1) Moving iron type AC
amperometer
Must be within rated.
No large changes shall be observed
compared to the normal data.
2) Voltage (*) As required 2) Rectifier type AC
amperometer
3) Temperature As required 3) Thermometer
(*) The voltage may vary depending on the measuring equipment. The same tester or amperometer should be used for inspections,
and the indicated value shall be recorded.
■ Check point
1. Whether there are any abnormalities in the installation environment
2. Whether there are any abnormalities in the cooling system
3. Whether there is any abnormal vibration or sound
4. Whether there is any abnormal heat or discolorization
5. Whether there is any abnormal smell
6. Whether there are any abnormal vibration, sound or temperature in the motor
7. Whether there are any cumulation of debris (conductive material)