Daily And Periodic Inspection Items - LG SV008iS5-2 Manual

5.6 Daily and Periodic Inspection Items

Is there any dust?
Ambient Is the ambient temperature and humidity
Environ- adequate?
ment
All
Is there any abnormal oscillation or noise
Equipment
Input Is the input voltage of the main circuit normal
Voltage
Megger check (between the main circuit and
the ground)
Are any fixed parts removed?
All
Are there any traces of overheating at each
component's cleaning?
Is the conductor rusty?
Conductor/
Is the wire coating damaged?
Wire
Terminal Is there any damage?
Check the resistance between each of the
IGBT
terminals.
Module
/Diode
Module
Is there any liquid coming out?
Is the safety pin out, and is there any
Smoothing
swelling?
Capacitor
Measure the capacitance.
Is there any chattering noise during
operation?
Relay
Is there any damage to the contact
Is there any damage to the resistor
insulation?
Is the wiring in the resistor damaged (open)?
Resistor
Is there any unbalance between each
phases of the output voltage?
Operation Nothing must be wrong with display circuit
Check after executing the sequence protective
operation
Is there any abnormal oscillation or noise?
Is the connection area loose?
Cooling
Fan
Is the displayed value correct?
Meter
Are there any abnormal vibrations or noise?
All
Is there any unusual odor?
Insulation Megger check (between the output terminals
Resistor and the ground terminal)
Note: Values in ( ) is for the 400V class inverters.
Inspection
Ο
Ο
Ο
Ο
Ο
Ο
Ο
Ο
Ο
Chapter 5 - Troubleshooting & Maintenance
Period
Inspection Method
Refer to the precautions
Use sight and hearing
Measure the voltage between the
terminals R, S, T
Undo the inverter connections short
Ο
the terminals R, S, T, U, V, W and
Ο measure between these parts and the
Ο
ground.
Ο
Tighten the screws.
Visual check.
Visual check
Ο
Ο
Ο Visual check
Undo the inverter connection and
Ο
measure the resistance between R, S,
T ⇔ P, N and U, V, W ⇔ P, N with a
tester.
Visual check.
Ο Measure with a capacitance
measuring device.
Auditory check.
Ο
Visual check.
Ο
Visual check.
Ο
Disconnect one of the connections
Ο
and measure with a tester.
Measure the voltage between the
Ο
output terminals U, V and W.
Short and open the inverter protective
Ο
circuit output.
Turn OFF the power and turn the fan
by hand.
Ο
Tighten the connections.
Ο Check the meter reading at the
exterior of the panel
Auditory, sensory, visual check.
Check for overheat and damage.
Ο Undo the U, V and W connections and
tie the motor wiring.
82
Measuring
Criterion
Instrument
Temperature: Thermometer,
-10~+40 no Hygrometer,
freezing. Recorder
Humidity: Under
50% no dew
No abnormality
Digital Multi-
Meter/Tester
DC 500V class
Over 5MΩ
Megger
No fault
No fault
No fault
(Refer 'How to Digital Multi-
Check Power Meter/Analog
Components") Tester
No fault Capacitance
Over 85% of the Measuring Device
rated capacity
No fault
No fault Digital Multi-
Error must be Meter/Analog
Tester
within ±10% the
displayed
resistance
The voltage Digital Multi-
balance between Meter/Rectifying
the phases for Voltmeter
200V (800V) class
is under 4V (8V).
The fault circuit
operates according
to the sequence.
Must rotate
smoothly.
No fault
Check the Voltmeter/
specified and Ammeter etc.
management
values.
No fault
500V class
Over 5MΩ
Megger