1.3.6
The motor vibrates and is getting noisier during rotations.
(Note) To distinguish between a fault of the mechanical portion including the
motor and that of the amplifier including the speed reference, take the
following procedure.
(i)
Rotate the motor at a high speed and press the pushbutton switch
PBl
(see Appendix
6(l))
on the SF-CA card to cause the motor to
rotate in the free run state.
(ii) In the free run state,
when the vibration and noise become smaller
than the normal operation of the motor,
it is supposed that the
mechanical portion is normal.
Item
Cause
Check Remedy
The motion balance of
o
Rotate the motor at a high
o
Improve the motion balance
the machine is bad.
speed,
cause the motor to
of the rotation portion of
rotate in the free run state, the machine.
and check that the mechanical
1
portion including the motor
is bad.
o
Remove the coupling between
the motor and machine,
separately rotate the motor,
and check the mechanical
portion is bad.
The motion balance of
o
Check that the motor
signi-
o
Replace the motor with a new
2
the motor is bad.
ficantly vibrates and
gener-
one.
ates noise in the Item 1
above.
The mounting screws
o
Check that the screws
o
Securely tighten the screws.
which fasten the motor
(flange portion or leg) which
3
to the machine are fasten the motor to the
loosen.
machine are loosen in the
Item 1 above.
The reference sine wave-
0
Observe that the waveforms
o
Replase the printed circuit
forms of the control
are balanced at the following
board SF-CA card with a new
circuit are disordered.
check terminals on the
one.
printed circuit board SF-CA (See Section
2.4.4.)
card using an oscilloscope.
4
.
Between CH14
-
CH9
SAGA):
Phase V
.
Between
CH15
-
CH9:
Phase W
.
Between CH23
-
CH9:
Phase
U
(See Appendixes
6(l)
and
9(l).)
The insulation
resist-
o
Remove the wires of the
o
Check the portions whose
ante
of the amplifier is
phases R,
S, and T of the
insulation is degraded and
degraded.
input power and measure the
clean and/or dry them to
following portions using a
restore the good insulation.
500 V megger.
(However,
the wires which are
o
If it is difficult to re-
connected to the ground
(E)
store the good insulation,
5
terminal should be removed.)
replace the printed circuit
board or the entire
ampli-
(a) Between main circuit
-
fier with a new one.
ground (The main circuit
consists of each terminal
of Xl, x2, x3, u, v, W,
MSl,
and
MS2.b
-44-
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