1.3.2
When
using
a
servo
motor
FX-1GM output unit
(PGU pulse)
mq
Forward pulse
--
Encoder
Amplifier
11
Feedback pulse
1
I
-A
I
1
I
3000,
2000,
1000
PIR
LJ
Amplifier
I--
Servo motor
I
I
--
I
I
Drive unit DRU
(commercially available product)
A commercially available AC or DC servo motor can be used.
The servo motor driver detects the amount
of
load movement by using the encoder and operates
the motor
so
that the deviation between the generated command pulse and the feedback pulse is
"
0"
.
Thus, improved accuracy can be ensured since this is a closed loop system.
The rotating speed
of
the motor is almost in proportion
to
the command pulse frequency.
When the pulse signal is received, the positive or negative pulse is counted by the deviation
counter.
If
this counter value becomes smaller than the in-position parameter value, the "positioning com-
pleted" signal is sent out, but the motor continues operating until the deviation counter reaches
within
2
1
pulse.
\
..,
MYorFing speed
Command pulse frequency
\
Short-time operation range
\
I I
-+
Rotating speed (rprn)
-+
Time
w
Adjustment time
-a-
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