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7-1
Chapter 7 MAINTENANCE AND INSPECTION
Perform daily and periodic inspection to avoid trouble and keep reliable operation for a long time.
Take care of the following items during work.
• Before proceeding to the maintenance and inspection, turn OFF the power and wait more than
five minutes. Make sure that the LED monitor is turned OFF. Further, make sure, using a
multimeter or a similar instrument, that the DC link bus voltage between the terminals P (+)
and N (-) has dropped below the safe voltage (+25 VDC).
Electric shock may occur.
• Maintenance, inspection, and parts replacement should be made only by authorized persons.
• Take off the watch, rings and other metallic matter before starting work.
• Use insulated tools.
• Never modify the inverter.
Electric shock or injuries could occur.
7.1 Daily
Inspection
Visually inspect errors in the state of operation from the outside without removing the covers while
the inverter operates or while it is turned ON.
-
Check if the expected performance (satisfying the standard specification) is obtained.
-
Check if the surrounding environment satisfies Chapter 2, Section 2.1 "Operating Environment."
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Check that the LED monitor displays normally.
-
Check for abnormal noise, odor, or excessive vibration.
-
Check for traces of overheat, discoloration and other defects.
7.2 Periodic
Inspection
Perform periodic inspection by the following items of the list of periodic inspection in Table 7.1.
Before performing periodic inspection, be sure to stop the motor, turn OFF the inverter, and shut
down power supply. Then remove the covers of the control and main circuit terminal blocks.
Table 7.1 List of Periodic Inspections
Check part
Check item
How to inspect
Evaluation criteria
Environment
1) Check the ambient temperature,
humidity, vibration and
atmosphere (dust, gas, oil mist, or
water drops).
2) Check if tools or other foreign
materials or dangerous objects are
left around the equipment.
1) Check visually or
measure using
apparatus.
2) Visual inspection
1) The standard
specification must
be satisfied.
2) No foreign or
dangerous objects
are left.
Voltage
Check if the voltages of the main and
control circuit are correct.
Measure the voltages
using a multimeter or
the like.
The standard
specification must be
satisfied.