Selection
number
Selection name Description
2
CS1 = Forward (edge)
CS2 = Backward (edge)
Use this function to prevent an accidental start. Before you
can start the motor again, you must open the start/stop
contact.
t
Output
frequency
FWD
REV
Ctrl signal 2
Ctrl signal 1
Run enable
Set
frequency
Set
frequency
0 Hz
1 2 3 4 5 6 7 8 9 10 11 12
Fig. 30: I/O A Start/stop logic = 2
1. Control signal (CS) 1 activates and
causes the output frequency to increase.
The motor operates forward.
2. CS2 activates, but it does not have an
effect on the output frequency, because
the direction that is set first has the
highest priority.
3. CS1 is becomes inactive and causes the
direction to start to change (FWD to
REV), because CS2 is still active.
4. CS2 becomes inactive and the frequency
that is fed to the motor goes to 0.
5. CS2 activates again and causes the
motor to accelerate (REV) to the set
frequency.
6. CS2 becomes inactive and the frequency
that is fed to the motor goes to 0.
7. CS1 activates and the motor accelerates
(FWD) to the set frequency.
8. The Run enable signal is set to FALSE,
which causes the frequency to go to 0.
Configure the Run enable signal with
parameter P3.5.1.15.
9. The Run enable signal is set to TRUE,
which does not have an effect, because a
rising edge is necessary for the start,
even if CS1 is active.
10. The STOP button on the keypad is
pushed and the frequency that is fed to
the motor goes to 0. (This signal only
works if the value of P3.2.3 Keypad Stop
Button is Yes.)
11. CS1 is opened and closed again, which
causes the motor to start.
12. CS1 becomes inactive and the frequency
that is fed to the motor goes to 0.
VACON · 238 PARAMETER DESCRIPTIONS
9
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