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Precautions for Maintenance and Inspection
3.2.6
Daily and Periodic Inspection
Area of
Inspection
Inspection
Item
Check ambient
Surrounding
temperature,
environment
humidity, dust, dirt,
etc.
General
Check for unusual
Overall unit
vibration and noese.
Power
Check that main
supply
circuit voltage is
voltage
normal.
(1) Check with
General
(2) Check for loose
(3) Check for
(4)Clean.
(1) Check conductors
Conductors,
(2) Check cable
cables
Terminal
Check for damage.
block
Mian circuit
Converter
Check resistance
module
across terminals.
(1) Check for liquid
(2) Check the safety
Smoothing
capacitor
(3) Measure
(1) Check for chatter
Relay
(2) Check for rough
(1) Check for crack in
Resistor
Interval
Periodic
Description
megger (across
main circuit
terminals and
ground termimal).
screws and bolts.
overheating of
each part.
for distortion.
sheaths for
breakage.
leakage.
valve for
projection or
bulge.
capacitance.
during operation.
surface on
contacts.
resistor insulation.
Method
Ambient
temperature:
(constant torque)
-10°C to + 50°C
(14°F to 122°F),
non-freezing.
(Refer to page 10)
(Variable torque)
-10°C to + 40°C
(14°F to 104°F),
non-freezing.
Ambient humidity:
90% or less,
non-condensing.
Visual and auditory
No fault.
checks.
Measure voltage
across power
Within permissible
regeneration common
AC voltage
converter
fluctuation (Refer
terminals R2/L1, S2/L2,
to page 44)
T2/L3.
(1) Disconnect all
cables from power
regeneration
common converter
and measure across
(1) 5M Ω or more.
terminals R2/L1, S2/
L2, T2/L3, P/L+, N/
(2),(3) No fault.
L- and ground
terminal with
megger.
(2) Re-tighten.
(3) Visual check.
(1), (2) Visual check.
(1), (2) No fault.
Visual check.
No fault
Disconnect cables from
inverter and measure
across terminals R2/L1,
(Refer to page 35) Analog meter
S2/L2, T2/L3, P/L+,
N/L- with a meter
range of 100 Ω.
(1), (2) Visual check.
(1), (2) No fault.
(3) Use capacitance
(3) 85% or more of
meter to make
rated capacitance.
measurement.
(1) Auditory check.
(1) No fault.
(2) Visual check.
(2) No fault.
(1) Visual check.
Cement resistor,
(1) No fault.
wire-wound resistor.
34
Criterion
Instrument
Thermometer,
hygrometer,
recrder
Meter,
digital
multimeter
500VDC
class
megger
Capacitance
meter
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