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Precautions for Maintenance and Inspection
Inspection
Description
Item
(1) Check for
General
(2) Check for
Check with
megger
Insulation
(across
resistance
terminals
and ground
terminal).
*For periodic inspection, contact your nearest Mitsubishi sales representative.
! ! ! ! Checking the inverter and converter modules
<Preparation>
(1) Disconnect the external power supply cables (R, S, T) and motor cables (U, V,
W).
(2) Prepare a meter. (Use 100Ω range.)
<Checking method>
Change the polarity of the meter alternately at the inverter terminals R, S, T, U, V, W, P
and N, and check for continuity.
CAUTION
•Before measurement, check that the smoothing capacitor is discharged.
•At the time of discontinuity, the measured value is almost
may not be measured when power is momentarily applied due to the influence
of the smothing capacitor. At the time of continuity, the measured value is
several to several ten's-of ohms depending on the module type, circuit tester
type, etc. If all measured values are almost the same, the modules are without
fault.
Interval
Periodic*
#
unusual
vibration
and
noise.
#
unusual
odor.
Method
(1) Auditory,
(1), (2) No fault.
sensory,
visual
checks.
(2) Check for
unusual
odor due to
overheat,
damage,
etc.
#
(1) Disconnect
(1) 5MΩ or
cables from
U, V, W
(including
motor
cables).
170
Criterion
Instrument
500V megger
more.
. Note that
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