(111
Alarm
No.32(OC)
Inverter Overcurrent
Item Cause
Check
Remedy
The input power voltage
o
Observe the voltage waveforms
0
Increase the power capacity.
waveform is defective.
at the input terminals Xl, X2,
and X3 of the amplifier using
0
Thicken the size of the
an oscilloscope.
cable between the input
power supply and amplifier.
0
Check that the voltage wave-
forms are as follows even in
0
Check other semiconductor
the acceleration or
decelera-
devices which generate
tion state.
distorted waveforms and
install surge killers and
(al
If the waveform is
par-
tially lost:
so force.
(For example, MATSUO made,
rating 200 VAC,
DCRZ-
12003-5041, etc.)
1
-L
It should be
100 us or less.
(bl
If the peak value drops:
<-.
t.-
It should be
2 to 3% or
less.
The input power
imped-
o
Check that the alarm occurs
0
Replace the power supply
ante
is high.
only when the motor speed
with an other one whose
(Example,
in the cases
decelerates from a high
power impedance is low.
that two transformers
speed.
2
are connected in series
0
Tighten the screws of
con-
or a variable
auto-
0
Check that the input voltage
nections
between the input
transformer is con-
temporarily drops to 170 V power supply and amplifier.
netted)
or less when the motor
decelerates.
The input power
fre-
0
Check the voltage frequencies
0
Check the cause of the fre-
quency remarkably
at the input terminals Xl,
quency
variation and
adlust
3
changes.
x2,
and X3 of the amplifier
the related controls so
using a frequency counter.
that it is in the specifica-
tion range.
The motor selection
4
parameters
#Ol
and
102
o
Check that the parameters are
0
Correctly set the
para-
correctly set by referencing
meters.
are not correctly set.
Reference 1.2.2.
(See Reference
1.2.3.)
The transistor module
0
Check that this alarm occurs
0
Replace the main circuit
is defective.
even after the equipment is unit of the amplifier with
reset.
a new one.
0
Disconnect the cable between
5
the amplifier and motor and
check that this alarm occurs
when only the amplifier is
operated.
(See Appendix l-2.1
-
30
-
Continued on the next page.
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