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3.2 MAINTENANCE AND INSPECTION
The high power factor converter is a static unit consisting mainly of semiconductor
devices. Daily inspection must be performed to prevent any fault from occurring due
to adverse influence by the installation environment, such as temperature, humidity,
dust, dirt and vibration, changes in the parts with time, service life, and other
factors.
3.2.1 Precautions for maintenance and inspection
For some short time after the power is switched off, the smoothing capacitor remains at a high voltage. Before
accessing the high power factor converter for inspection, make sure that the charge lamp is off and check that
the voltage across the main circuit terminals P-N of the high power factor converter is 30VDC or less using a
tester, etc. (For the location of the charge lamp, see the terminal block arrangement on page 60.)
The reactors 1 and 2 are hot. Take care not to get burnt.
3.2.2 Check items
(1) Daily inspection
• Check the following during operation:
(1) Improper installation environment
(2) Cooling system fault
(3) Unusual vibration and noise
(4) Unusual overheat and discoloration
• During operation, check the input voltage of the high power factor converter using a tester.
(2) Periodic maintenance and inspection
• Check the areas inaccessible during operation and requiring period inspection.
(1) Cooling system: Clean the air filter, etc.
(2) Screws and bolts: Check that they are securely tightened and retighten as necessary.
(3) Conductors and insulating materials: Check for corrosion and damage.
(4) Insulation resistance: Measure.
(5) Cooling fan, smoothing capacitor, relay: Check and change if necessary.
Note:Have a proper understanding of the definitions of power and error (alarm) indications provided for the
high power factor converter. Also, have a proper understanding of the settings with the parameter unit
and record proper set values. (Enter the values into the Customer Setting section of the "Parameter
List" on page 31.)
See the next page for the Inspection List.
(3) Insulation resistance test using megger
(1) Before performing the insulation resistance test using a megger on the external circuit, disconnect
the cables from all terminals of the high power factor converter so that the test voltage is not applied
to the high power factor converter.
(2) For the continuity test of the control circuit, use a tester
(high resistance range) and do not use the megger or
buzzer.
(3) For the high power factor converter, conduct the
insulation resistance test on the main circuit only
as shown on the right and do not perform the test
on the control circuit. (Use a 500VDC megger.)
CAUTION
Power supply
500VDC
megger
- 46 -
Inverter
R4
P
High power
S4
factor converter
INV
T4
N
Earth terminal
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