Chapter 7 - Troubleshooting & Maintenance
7-9
7.5.5 Daily and Periodic Inspection Items
Period
Inspection
Location
Inspection
Item
Inspection
Daily
1 year
2 year
Inspection Method Criterion
Measuring
Instrument
Ambient
Environ-
ment
Is there any dust?
Is the ambient temperature and
humidity adequate?
Ο
Refer to the precautions. Temperature:
-10~+40 no
freezing.
Humidity: Under
50% no dew
Thermometer,
Hygrometer,
Recorder
Equipment
Is there any abnormal oscillation or
noise?
Ο
Use sight and hearing. No abnormality
All
Input
Voltage
Is the input voltage of the main circuit
normal?
Ο
Measure the voltage between the
terminals R, S, T.
Digital Multi-
Meter/Tester
All
Megger check (between the main
circuit and the ground)
Are any fixed parts removed?
Are there any traces of overheating at
each component’s cleaning?
Ο
Ο
Ο
Ο
Undo the inverter connections
short the terminals R, S, T, U, V,
W and measure between these
parts and the ground.
Tighten the screws.
Visual check.
Over 5MΩ
No fault
DC 500V class
Megger
Conductor/
Wire
Is the conductor rusty?
Is the wire coating damaged?
Ο
Ο
Visual check No fault
Terminal
Is there any damage?
Ο
Visual check No fault
IGBT
Module
/Diode
Module
Check the resistance between each of
the terminals.
Ο
Undo the inverter connection and
measure the resistance between R,
S, T ⇔ P, N and U, V, W ⇔ P,
N with a tester.
(Refer ‘How to
Check Power
Components”)
Digital Multi-
Meter/Analog
Tester
Smoothing
Capacitor
Is there any liquid coming out?
Is the safety pin out, and is there any
swelling?
Measure the capacitance.
Ο
Ο
Ο
Visual check
Measure with a capacitance-
measuring device.
No fault
Over 85% of the
rated capacity
Capacitance
Measuring
Device
Relay
Is there any chattering noise during
operation?
Is there any damage to the contact
Ο
Ο
Auditory check
Visual check
No fault
Main Circuit
Resistor
Is there any damage to the resistor
insulation?
Is the wiring in the resistor damaged
(open)?
Ο
Ο
Visual check
Disconnect one of the connections
and measure with a tester.
No fault
Error must be
within ±10%
the displayed
resistance.
Digital Multi-
Meter/Analog
Tester
Control Circuit
Protective Circuit
Operation
Check
Is there any unbalance between each
phases of the output voltage?
Nothing must be wrong with display
circuit after executing the sequence
protective operation.
Ο
Ο
Measure the voltage between the
output terminals U, V and W.
Short and open the inverter
protective circuit output.
The voltage
balance between
the phases for
200V (400V)
class is under 4V
(8V).
The fault circuit
operates
according to the
sequence.
Digital Multi-
Meter/Rectifyin
g Voltmeter
Cooling
System
Cooling
Fan
Is there any abnormal oscillation or
noise?
Is the connection area loose?
Ο
Ο
Turn OFF the power and turn the
fan by hand.
Tighten the connections.
Must rotate
smoothly.
No fault
Display
Meter
Is the displayed value correct?
Ο Ο
Check the meter reading at the
exterior of the panel.
Check the
specified and
management
values.
Voltmeter/
Ammeter etc.
All
Are there any abnormal vibrations or
noise?
Is there any unusual odor?
Ο
Ο
Auditory, sensory, visual check.
Check for overheat and damage.
No fault
Motor
Insulation
Resistor
Megger check (between the output
terminals and the ground terminal)
Ο
Undo the U, V and W connections
and tie the motor wiring.
Over 5MΩ
500V class
Megger
Note: Values in ( ) is for the 400V class inverters.
Note: Life cycle of the Main components indicated above is based on continuous operation with rated load. It may vary with surrounded environment.
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