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72 Chapter 5 Parameters
EV1000 Series General Purpose Variable Speed Drive User Manual
F9.18 Shaft
circumference
Range: 0.01
~
100.00cm
【
10.00cm
】
F9.19 Pulse per
revolution
Range: 1
~
9999
【1】
The above parameters are used for length control,
i.e. the drive will stop when arriving certain length.
The counting pulse is input from X4 or X5 which is
defined as function No. 44, refer to F7.03~F7.04.
The length is calculated based on F9.19 and
F9.18.
Calculated length
=
number of counting pulse÷
number of pulse per revolution × shaft
circumference
After correcting the calculated length by F9.16
and F9.17, the actual length is obtained.
Actual length
=
calculated length
×
F9.16
÷
F9.17
When the actual length
(
F9.15
)≥
preset length
(F9.14), the drive will stop automatically. You
must clear the actual length record or modify the
setting of it to a value smaller than F9.14, or the
drive cannot be started.
Note
:
The actual length can be cleared by multi-function
input terminal, i.e. to set the corresponding parameter
of Xi at 39. The actual length and pulse number can be
calculated only after this terminal is disconnected.
Actual length (F9.15) will be saved after power off
automatically.
Function of stop at fixed length is disabled if F9.14 is
set to 0, but the calculated length is still effective.
Application of stop at fixed length:
Fig. 5-67 Application of Stop at Fixed Length
In Fig. 5-67, the drive drives the motor, and the
motor, in turn, drives the spindle through the
conveyer. The shaft that contact with the spindle
can measure the line speed of it which will be
transmit to the drive by the sensor in the form of
pulse. The drive will calculate the length based on
the number of pulses it received. When the actual
length
≥
preset length, the drive will give Stop
command automatically to stop the spinning. The
operator can remove the spindle and close the
“Clear Length” terminal (set any of F7.00~7.04 at
39). The drive is then ready for the next spindle
process.
F9.20 Low voltage
compensation (trip-free)
Range: 0
、
1
【
0
】
F9.21 Freq. decrease
rate during voltage
compensation
Range: 0.00~99.99Hz/s
【
10.00Hz/s
】
F9.20
is to select whether to enable low voltage
compensation in case of voltage drop or
undervoltage by reducing output frequency to get
energy feedbacked from the load, so that the
drive will not trip.
F9.20=0, disabled
F9.20=1, enabled
If the setting of F9.21 is set too big, the feedback
energy of motor will be more than expected and
may cause over-voltage protection; if the setting
of F9.21 is set to small, the feedback energy of
motor is not enough, hence trip might occur. It is
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