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170
Precautions for Maintenance and Inspection
*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.
Motor
General
(1) Check for
unusual
vibration
and
noise.
(2) Check for
unusual
odor.
#
#
(1) Auditory,
sensory,
visual
checks.
(2) Check for
unusual
odor due to
overheat,
damage,
etc.
(1), (2) No fault.
Insulation
resistance
Check with
megger
(across
terminals
and ground
terminal).
#
(1) Disconnect
cables from
U, V, W
(including
motor
cables).
(1) 5MΩ or
more.
500V megger
CAUTION
•Before measurement, check that the smoothing capacitor is discharged.
•At the time of discontinuity, the measured value is almost . Note that
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.
Area of
Inspection
Inspection
Item
Description
Interval
Method Criterion Instrument
Customer
Check
Daily
Periodic*
1 year
2 years