Hitachi WJ Series User Manual page 405

Chapter 16
Inspected Inspected
part entry
While performing a unit
operation of the inverter,
check the balance of the
Control
output voltage among the
circuit
Operation
individual phases.
check Carry out a sequential
Protection
protection test, and
circuit
check the protective and
display circuits for any
abnormality.
Check that there are no
abnormal vibrations or
noises.
Cooling fan
Cooling
Check for loose
system
connections.
Check for obstrutions/
Cooling fin
clogging.
Check if the charge lamp
and the keypad's LEDs
Display
light up.
Display Display cleaning.
Check that Indicated
External meter
values are normal.
Check that there are no
abnormal vibrations or
noises.
General
Check that there is no
odour.
Motor
Check the resistance
Insulation
between the main circuit
resistance
and the ground terminals.
*1. The life span of the smoothing capacitor is influenced by the ambient temperature. Refer to
"16.2.5 Smoothing Capacitor Life Curve" for replacing measures.
*2. The life span of the cooling fan is influenced by the ambient temperature, the dirt and the
change in its environmental conditions. Check these circumstances on the usual inspection.
*3. The estimated time before replacement (Number of years/cycle) and the "16.2.5 Smoothing
Capacitor Life Curve" are based on the design lifespan, not guaranteed.
*4. In case using an inverter with a long storage period, perform the following aging before use.
(Aging is not required if the storage temperature is 5 to 35 °C and within 2 years.)
 If the input voltage can be adjusted: Input about 150 VAC for 200 V class and about 300
VAC for 400 V class for about 10 minutes, then gradually input higher value and operate
while checking the functions.
 If the input voltage cannot be adjusted: Input the inverter rated voltage and run for about
30 minutes to check for any problems with the functions. Then, turn on the power again to
perform full-scale operation.
*5. If the cooling fan is locked due to dust, etc., it takes about 5 to 10 seconds to restart even if
dust is removed.
*6. Follow the instruction manual for the motor.
Inspection
cycle
Details of inspection
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
Maintenance and Inspection
Every
Inspection method
Measure the line voltages
between the [U/T1],
[V/T2], and [W/T3]
terminals of the inverter
main circuit.
Simulate a shortcircuit or
open of the inverter
output protection circuit.
Check auditorily and
visually.
Check visually.
Check visually.
Check visually.
With cleaning rag.
Check the meters
readings on the control
panel.
Check visually,auditorily,
and by touch.
Check for abnormal
superheating, damages
and so on.
Remove the wiring from
the main circuit terminals
[U/T1], [V/T2] and [W/T3]
of the inverter,
*6
shortcircuit the motor
wire (for 3 phases), and
measure with a megger®
between the motor wire
andthe ground terminal.
16-2-2
Criterion Tester device
Phase-to-phase voltage
balance
200 V class: within 4 V
Digital
400 V class: within 8 V
multimeter,
Ammeter,
Voltmeter
An error must be
detected according to the
sequence.
Smooth operation. No
abnormality. Wind flows
to the top.
Approximate replacement
period:
10 years *2*3*5
No clogging.
Check the lighting.
Voltmeter,
Regulation and control
Ammeter,
value are satisfactory.
etc.
No abnormality.
No abnormality.
500 VDC
class
No less than 5 MΩ.
ohmmeter
(megger®)