7-1
Chapter 7
0B
MAINTENANCE AND INSPECTION
Perform daily and periodic inspection to avoid trouble and keep reliable operation of the inverter for a
long time. When performing inspections, follow the instructions given in this chapter.
• Before proceeding to the maintenance and inspection, turn OFF the power and wait at least
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 level (+25 VDC or below).
Electric shock may occur.
• Maintenance, inspection, and parts replacement should be made only by authorized persons.
• Take off the watch, rings and other metallic objects before starting work.
• Use insulated tools.
• Never modify the inverter.
Electric shock or injuries could occur.
7.1
1B
Daily Inspection
Visually inspect the inverter for operation errors from the outside without removing the covers when
the inverter is ON or operating.
-
Check that the expected performance (satisfying the standard specifications) is obtained.
-
Check that the surrounding environment satisfies the requirements given in Chapter 2, Section
2.1 "Operating Environment."
-
Check that the LED monitor on the keypad displays normally.
-
Check for abnormal noise, odor, or excessive vibration.
-
Check for traces of overheat, discoloration and other defects.
7.2
2B
Periodic Inspection
Perform periodic inspection according to the items listed in Table 7.1. Before performing periodic
inspection, be sure to stop the motor, shut down the power to the inverter, and then remove the
terminal block covers.
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 that tools or other foreign
materials or dangerous objects are
not 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 that the input voltages of the
main and control circuit are correct.
Measure the voltages
using a multimeter or
the like.
The standard
specifications must
be satisfied.