Hitachi WJ200 Series Instruction Manual page 259

4−56
Frequency arrival output [FA1] uses
the standard
(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
Hz below or
target constant frequency, where
1% of the set maximum frequency and
Foff
is 2% of the set maximum
frequency. This provides hysteresis that
prevents
threshold value. The hysteresis effect
causes the output to turn ON slightly
early
as the speed approaches the
threshold. Then the turn-OFF point is
delayed
slightly
nature of the signal, due to the open
collector output.
Frequency arrival output [FA2/FA4]
works the same way; it just uses two
separate thresholds as shown in the
figure to the right. These provide for
separate acceleration and deceleration
thresholds to provide more flexibility
than for
C042/C045
ON threshold, and
deceleration for the OFF threshold.
This signal also is active low. Having
different accel and decel thresholds
provides
function. However, you can use equal
ON and OFF thresholds, if desired.
Frequency arrival output [FA3/FA5]
works also the same way, only difference
is arriving at set frequency.
output frequency
Fon
Hz above the
output chatter near
. Note the active low
[FA1]. [FA2/FA4]
during acceleration for the
C043/C046
an asymmetrical
Output
freq.
Fon
is
0
the
FA1
signal
Foff=2% of max. frequency
Output
freq.
thresholds
C042/C045
C043/C046
uses
0
during
FA2/FA4
signal
output
Foff=2% of max. frequency
Output
freq.
thresholds
C042/C045
C043/C046
0
FA3/FA5
signal
Foff=2% of max. frequency
Foff
F001
Fon
Foff
Fon
ON ON
Fon=1% of max. frequency
Fon
ON
Fon=1% of max. frequency
Foff
Fon
Fon
ON ON
Fon=1% of max. frequency
F001
Foff
Foff