Hitachi WJ C1 Series User Manual

Chapter 16 Maintenance and Inspection
16-2-1
16.2 Daily Inspection and Periodic Inspection
16.2.1 Inverter Inspection List
Inspected
part
Inspected
entry
Details of inspection
Inspection
cycle
Inspection method
Criterion
Tester device
Daily
Every
1 year
2 years
General
Surrounding
environment
Check the ambient
temperature, level of
humidity, dust, … etc..
✓
Refer to "Chapter 4
Installation".
The ambient temperature
and level of humidity are
within the operating
range.
There are no freeze,
condensation, dust,
corrosive gas, explosive
gas, flammable gas,
grinding fluid mist,
hydrogen sulfide and salt.
Thermometer,
Hygrometer,
Data logger
Whole inverter
Check that there are no
abnormal vibrations or
noises.
✓
Check visually and
auditorily.
No abnormality.
Power supply
voltage
Check that the main
circuit voltage is normal.
✓
Measure the line-to-line
voltage of the inverter
main circuit terminals
[R/L1], [S/L2], and [T/L3].
Within the allowable AC
voltage fluctuation.
Multimeter,
Digital
multimeter
Main
circuit
General check
Check the resistance
between the main circuit
and the ground terminals.
(between main circuit and
ground terminals)
✓
Remove all wires from the
main circuit terminal block
and control circuit terminal
block of the inverter. Then,
shortcircuit the terminals
[R/L1], [S/L2], [T/L3],
[U/T1], [V/T2], [W/T3],
[P/+], [PD/+1], [N/-] and
[RB], and measure between
this shortcircuited part and
the ground terminal.
Resistance no less than 5
MΩ.
500 VDC
class
ohmmeter
(megger®)
Check looseness in
tightening parts.
✓
Check tighten.
No abnormality.
Check for overheating
traces.
✓
Check visually.
No abnormality.
Conductors
and cables
Check for straining in
conductors.
✓
Check visually.
No abnormality.
Check for cable coating
damage.
✓
Terminal block
Check for any damage.
✓
Check visually.
No abnormality.
Inverter and
converter
circuits
(including
resistors)
Check the resistance
between all the terminals.
✓
Remove all wires from the
main circuit terminal
block of the inverter.
Then measure between
[R/L1]/[S/L2]/[T/L3] -
[P/+]/[N/-], and between
[U/T1]/[V/T2]/[W/T3] -
[P/+]/[N/-] in the 1 Ω
range.
Refer to "16.2.4 Checking
the Inverter and
Converter Section".
Reference for
replacement of the
inverter ank converter
Start/Stop: 10
6
cycles
*3
Analog
multimeter
Smoothing
capacitor
Check for capacitor fluid
leakage.
✓
Check visually.
No abnormality.
Approximate replacement
period: 10 years
*1*3*4
Check that the relief valve
does not swell or protude.
✓
Relay
No chatter sound while
operating.
✓
Check auditorily.
No abnormality.
Check contacts for
damage.
✓
Check visually.
No abnormality.

Hitachi WJ C1 Series Specifications

General

Brand	Hitachi
Model	WJ C1 Series
Category	Inverter
Language	English