6.4.4
Internal operations
of
the
PGU
The
110
signals are only read/written at certain times and are specified in the following table:
Signal fetching timing
c
.
Motor
Speed
Command pulses generated by the PGU have a time duration expressed by integers
in
l-psec
units. Therefore, the pulse generation frequency is obtained as follows:
f
=
-
x
lo6
(PPS) where n is an integer in the
5
to
50,000
range.
1
2n
When n
=
5,
f
=
100,000
PPS. When n
=
6,
f
= 83,333 PPS. Any frequency between these is
not available.
If
parameter setting or a speed command designates
90,000
PPS, actual operation is executed
with 83,333
PPS
which is the closest available frequency.
When a stepping motor is driven in a high frequency range, there may be abrupt fluctuations in
frequency and the motor may malfunction. The recommended frequency range is
20
kPPS or
less.
d
-96-
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