Hitachi CP-X200 Instruction Manual page 190

Frequency arrival output [FA1] uses the
standard output frequency (parameter
F001) as the threshold for switching. In
the figure to the right, Frequency
Arrival [FA1] turns ON when the
output frequency gets within
Fon
below or Hz above the target
constant frequency, where
the set maximum frequency and
2% of the set maximum frequency. This
provides hysteresis
output chatter near the threshold value.
The hysteresis effect causes the output
early
to turn ON slightly
approaches the threshold. Then the
turn-OFF point is slightly
timing is further modified by a small 60
ms delay. Note the active low nature of
the signal, due to the open collector
output.
Frequency arrival output [FA2] works
the same way; it just uses two separate
thresholds as shown in the figure to the
right. These provide
acceleration and deceleration thresholds
to provide more flexibility than for
[FA1]. [FA2] uses
acceleration for the ON threshold, and
C043 during deceleration for the OFF
threshold. This signal also is active low
and has a 60 ms delay after the
frequency thresholds
Having different accel
thresholds provides an asymmetrical
output function. However, you can use
equal ON and OFF thresholds, if
desired.
Output
Fon
Hz
Fon is 1% of
Foff
is
that prevents
as the speed
signal
delayed . The
thresholds
for separate
C042 accel.
C043 decel.
C042 during
are crossed.
and decel
F001
Fon
freq.
Fon
0
FA1
ON
60ms
Fon=1% of max. frequency
Foff=2% of max. frequency
Output
freq.
Fon
0
FA2
ON
signal
60ms
Fon=1% of max. frequency
Foff=2% of max. frequency
4 − 41
4 41
Foff
F001
Foff
ON
60ms
Foff
60ms