Subject to change without notification
Subject to change without notification
3.5 Velocity Control
3.5.1 Analog Speed Setup
There are several ways to set the velocity, i.e. the rotational speed: external control may be
selected via analog voltage (Chapter
3.5.1
) or a pulse train input (Chapter
3.5.2
). Presetting of
a rotational speed value via the programmable interface is described in Chapter
3.5.3
.
The selected mode also has an indirect effect on the rotational speed: Positioning Mode (
3.6
),
Stepper Motor Mode (
3.7
) and Pointer Mode (
3.8
).
16
Rotational speed is setup via the analog inputs with
contmod
and
sor 1
(see Chapter
2.2.3
).
This is also the factory delivered state of the module. The programmable interface is not
relevant in this operating mode; however, the choice of speed mode can be changed via the
programmable interface.
Fig. 8: Transfer characteristic of the analog speed setup
The drive’s rotational speed will correspond to the analog voltage at the inputs
Velocity 1
and
Velocity 2
. The voltage must lie between 0V and 5V. In order to guarantee flexible control,
the relationship between the analog voltages and the rotational speed can be varied. Direc-
tion of rotation is determined by the
Direction
input, not by negative analog voltages, which
are not permitted.
With the command
mav
, the user presets the voltage at which the drive will start up.
This is useful for applications in which no precise 0V level is available, and in which therefore
the drive cannot be brought to full standstill. The command
maxav
sets the voltage at which
the drive reaches its maximum rotational speed. Maximum rotational speed is set by the com-
mand
sp
. Minimum speed, which is different from zero, is determined via the command
mv
.
The drive will run when the minimum voltage applies. At lower-level voltages it will come to rest.
