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(13) Alarm
No.23(OSE)
Speed Control Error Excess
[The difference between the speed reference
value and real speed is checked and if the
deviation which is 50 rpm or more lasts
for 12 sec. or more, an alarm occurs.1
Item
Cause
Check
Remedy
The phase sequence of
o
Increase the reference speed
D
Correctly connect the wires
wires
U,
V,
and W which
and check that the motor
U,
V,
and W between the
are connected between
rotates at a low speed.
amplifier and the motor.
the amplifier and the
motor is incorrect.
o
Visually check the phase
sequence of wires
U.
V,
and W.
One of the wires
U,
V,
o
Check that the motor does not
0
Replace the power wire which
and W which are
con-
smoothly rotate.
is broken with a
new one.
netted
between the
amplifier and the motor
o
Remove the wires U, V, and W
is broken.
on the amplifier side and
check that there is no elec-
tric discontinuity in the
wires
U,
V, and W.
The motor is overloaded.
o
Check whether the motor is
o
Review the cutting condition
overloaded using a load meter
and tool being used.
or load display in the status
display mode.
(See Section 1.1.1)
The printed circuit
board SF-CA card is
defective.
D
Replace the SF-CA card with a
o
Replace the printed circuit
new one and check that the board SF-CA card with the
equipment correctly works.
new one.
(See Chapter 2.)
The integration gain
D
Check the parameters being
o
Set the parameters to the
parameter VKI (amplifier
set by referencing Section
standard values by refer-
parameter X37; NC
para-
1.1.1
or 1.1.2.
encing Reference 1.2.2 or
meter:
#23)
of the speed
1.2.3.
loop is set to 0.
0
If the motor unstably
rotates,
set the parameters
to correct values by refer-
encing Alarm No. 31 Item 2.
The volume on the
o
Check that the motor rotates
0
Adjust the volume
VRl,
VR2.
printed circuit board
at several
ten
rpm and the
VR3,
and VR4 so that the
for the motor built-in
speed display is
"0".
output waveforms of phases
encoder (in the motor
o
Set the parameters of the
A and B are in the
stand-
terminal box) is not
correctly adjusted.
amplifier as follows and
in-
ard value range by refer-
put the speed reference and
encing the section
relat-
start command to rotate the
ing to adjustment and
motor at a low speed.
The
replacement of motor
parameter 00 becomes valid
built-in encoder (Section
just after it is set to
"ll..
6.9).
Since the parameter is
cleared when the power is
turned off or reset, after
it is set to
"l",
input the
speed reference and start
command.
Continued on the next page.
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28
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