Hitachi WJ200-001S Instruction Manual page 263

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
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
/
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
set maximum
output chatter near
. Note the active low
[FA1]. [FA2/FA4]
during acceleration for the
/
an asymmetrical
Output
freq.
Fon
is
0
the
FA1
signal
Foff=2% of max. frequency
Output
freq.
thresholds
/
/
uses
0
during
FA2/FA4
signal
output
Foff=2% of max. frequency
Output
freq.
thresholds
/
/
0
FA3/FA5
signal
Foff=2% of max. frequency
Foff

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

Foff
Foff