Adjusting the drive unit
Since the following points in the drive unit have to be adjusted, the correct setting must be executed
in advance.
The operating characteristics of the drive
unit can be adjusted in various ways by DIP
switches, potentiometers, keys, etc.
Adjust the position or speed
loop
gain,
speed integrating compensation value, and
maximum rotating speed setting according
to the load specifications.
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Some drive units have a P-RATE (pulse rate) parameter. This is used to match the pulse rate of
the driver output with the FX-1GM output.
If the servo driver has a max. rate of
200
kPPS (kilo-pulses per sec.), this pulse rate multiplier
must be set at x
2
since the max. output from the FX-1GM is only
100
kPPS.
The required output pulse rate from the servo driver is directly related to the speed and the num-
ber of pitches per revolution of the motor and encoder,
A
relatively large
IN-POS
(imposition) parameter setting allows the positioning completed signal
to be sent earlier.
For details. see the Servo Driver Instruction Manual.
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Positioning accuracy
The theoretical accuracy in the positioning unit using a stepping motor or servo motor is
restricted by the feed rate per pulse.
This can be calculated as follows in respect
to
the relationship between the pulse frequency and
feed speed.
f: Pulse frequency (PPS)
61
=+
-
x
1
o
(pm/PLS)
V:
Feed rate (m/min.)
61:
Feed rate per pulse(pm/PLS)
V
60f
For instance, when
V
is Gm/min. and
f
is 100000 PPS, the theoretical accuracy will be
+
lpm.
-9-
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