I
1 Troubleshooting
I
1.3 Checking method and
remedy of trouble
classification
B
(14) Alarm
No.31(0S)
Overspeed
(The real speed of the motor is checked
and when it exceeds 115% of the motor
maximum speed,
this alarm occurs.)
-~-
--
Item Cause Check
Remedy
The reference speed
o
Compare the reference speed
0
Decrease the reference
exceeds 115% of the
with the following maximum
speed.
maximum speed. speed being set.
o
Correctly set the parameter
1
Parameter being set from
for motor maximum speed.
the amplifier:
#31(TSP)
Parameter being set from
the NC: #17(TSP)
(See References
l-2.2(2)
and
1.2.3(3).)
The speed control system
o
Observe and check the signal
0
Decrease the parameter
is unstable and an
over-
between the speed signal
values of the speed loop
shoot occurs.
terminals SMO and OM using
gain VKP and VKI (amplifier
an oscilloscope (See
Appen-
parameter
Y36
and
#37
or NC
dixes l-4 and l-5).
parameters
#22
and X23).
(Note) To check the occurrence
o
If the signal output is
(b) If the alarm does not
saturated when it exceeds
occur,
10 V because
a
too high speed
decrease the parameter
is set,
check that the
volt-
values of VKP and VKI.
age rises to around 115% in
the speed mode of the status
display (see Section
1.1.1)
or using the NC CRT monitor.
The motor built-in
en-
D
In the same manner as the
o
In the same manner as the
coder is defective.
alarm
No_23(OSE),
check the
alarm
No.23(OSE),
adjust or
encoder output signal
wave-
replace the motor built-in
form using the oscilloscope.
encoder with a new one.
o
Rotate the motor using the
reference speed which is
slower than
the
middle speed
3
and check that the frequen-
cies of the signals of the
phase
A or B satisfy the
following relation.
f(Bs)
=
+
x
(motor
speed(rpm)
1
The printed circuit
o
Replace the SF-CA card with
o
Replace the printed circuit
4
board SF-CA card is
a new one and check that it
board with a new one.
defective.
correctly
works.
(See
Section 2.4.4.)
!
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