Mitsubishi FREQROL FR-A044-0.4K

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23. INSPECTION AND MAINTENANCE
7;; ir
r
Con(.ntS JudgcMnt
Mer diSonneCtmp
111 wires at me
Inverter terminals.
measure
resistance
across temlnals R,
S, 5 and, P, N, and
U. V, W and P, N
rrith a muitimeter in
the
x 1n nnge.
(1) (2) Visual
(3) Measure
wtth
iwpBCtlon
a capacitance
measuring
instrument
Inverter
Mule
Conver.
ter
Resicltance
moss me
lerminais
(1) Leak of fluld
(2) Protruwn of
the salely
vabe. or
bulplng.
(3) Measurinp me
capacitance
(1) Chattering
Faise during
(2) SmOOmnes
operation
on contacl
(1) Crack on
resetor
insulator
(2) Disconnecfior
Wity
neter
1) (2) Must be
free of
ahmall-
ties.
3) High than
85% Of Me
rated cawdly
1) Must be free of
2) Must be tree of
Ibnormalities.
abnormalitles
lain
ircuit
(1 ) Listening
(2) Vkuai
inspection
inspection
Relay
-
tor
ReSIS-
1) Must be free of
abnormalltles.
2) Must be wilhln
f10% Of me
indiuted
resistance.
(1) Visual lnspectlon
Cement
wound reststor
resistoIs, wlre
(2) Olsconnect the
wire at one side
and measure
a multimeter
reslslance with
(1) Measure
voltage across
the inverter
output
terminals U,
(2) Short the
v. w.
inverter
circuit wputs
protection
rester.
jigital
nuninmter
Digital
nuillmeter,
rectifier
dolbmter
(1) Check the
balance
of
output voilape
interphase
the Inverter
by opentlnp
(2) Conduct the
Independently.
sequence
protection
operation test
to
check the
protection and
display circuits
1) Imbalance
should be
uimin 4V
(for
2WV), BV
2) me dann
( for 400V).
should be
OUtpvt.
htrd
ircuit
'rote
ircuit
on
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