Hitachi J300U Series Instruction Manual page 84

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