24.
TROUBLESHOOTING
Function
Mame
CPU error
Cunent
prevention
limn
stall
Ground Fault
During
accele-
ration
Dumg
slant
8P-d
opera-
tin
-
con-
-
During
decele-
ration
Fan failure
Option alarm
Descrlptlon
ll
the
cycle
of
the
CPU
is
not
completed within the
set
time,
rhe
selfdiagnostics interprets
MIS
as
an
error and shuts
off
Mrter
output.
If
current exc%eding
150%
(‘4)
of
the
rated inverter cumnt
Aows
in
the
motor, frequency
ramp
is hailed until load current
is reduced
to
prevent overcurrent shut-off
the
inverter.
If
the
load current is reduced to
150%,
the
frequency
will
iwrease
am.
If
current
exceedng
150%
(‘4)
of
the
rated inverter current
fbws
m
(he
motor,
fmquency
ramp
is
hatted
until
load current
is
reduced
to
pmnl overcurrent
shut-otf
of
the
inverter.
If
the
!+ad
arrent is reduxd
to
150%,
the
frequency
wlll
imreese again.
If
the mtor regeneration
energy
increases
excmsively and
exceeds
brake
petlonsnce,
ais
function stops
decreasing
of
the freqwncy to prevent
overvoltage
shut-&.
Dederation
conthwrs after
the
regeneration energy has been reduced.
If
current exceeding
150%
(‘4)
of
the rated inverter current
flows
in
the
motor, frequency decrease is halted until load
current is reduced
to
prevent overcurrent shut-&
d
the
inverler.
If
the load current
is
reduced
to
150%,
the
frequency
will
decrease again.
If
a ground fauil current
has
flown
due
to a ground faun
occurring in the
output
(load)
side
of the
inverter, this
function
stops
the
inverter
output.
A
ground faun occurring at
low ground residtraxe may activate
the
overcurrent protection
(03
to
OC3).
(Provided for
the
4OOV
type
only.)
When
the
Cooring
fan
of
the
inverter has
stopped
due
to
a
foreign matter stuck in the fan or maiiunction, the inverter
output
witl
be
c8ased.
(1.5K
to
3.7K
2OOV.
2.N.
3.7K
4OOV)
Uskg
computec communication,
ii
times
of
communication
retries are exceeded or check time interval
is
exceeded.
the
inverter
outplt
is shut
on.
€.fPU
(CPU)
Indicating lamp
d
the monitor
mode
blinks
f-t
LCd
Indicating lamp
of
the monitor
mode
blinks
E.&[
(OLT)
Alter
the
stop.
1
Indicating lamp
of
the
mmRor
mode blinks.
I
E.
Cf
(OF)
E,fRn
(FAN)
Em
(OPT)
.d
-
108-
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