Hitachi J300U Series - Manual (Page 84)

10-3
Daily Inspection and Periodic Inspection (1/3)
Inspection cycle
Inspection
location
Inspection item Inspection content Inspection method Criteria
Standard
replacement
period
Instruments
Daily Periodic
Overall Ambient
environment Check ambient temperature,
humidity, dust, corrosive
gases, oil mist, etc. Ambient temperature
between -10 to +50˚C;
no icing. Thermometer __
Devices overall Check for abnormal
vibrations and noise. Visual and aural
inspection.
Ambient humidity 20 to
90%; no dew condensation.
Hygrometer
Power supply
voltage Check the input line voltage. Measure the voltage
between inverter
terminals R(L1),
S(L2) and T(L3). No abnormalities.
200 to 220 V, 50 Hz
200 to 230 V, 60 Hz
380 to 415 V, 50 Hz
400 to 460 V, 60 Hz Tester
Main
circuit Overall (1) Insulation resistance test
(between main circuit
terminals and grounding
terminal)
(2) Check installation for
looseness.
(3) Check for evidence of
overheating in the various
components.
(4) Clean.
No abnormalities in (1) and
(2).
Tightening torque (kgf.cm)
• M3: 8 - 10
• M4: 12 - 15
• M5: 20 - 25
• M6: 25 - 30
• M8: 100 - 135
• M10: 150 - 200
Tightening torque for IPM
and Diode modules
(kgf.cm)
• M4: 10-15
• M5: 15-20
• M6: 20-25
__ 500 V class
Megohm meter
(2) Tighten.
(3) Visual
inspection.
(1) Increase tighting
Making a check
on the terque is
needed for the
increase tighten-
ing of the modules
such as a power
module, diode
module. Do not
execute increse
tightening with
no torque gauge
prepared.