Subject to change without notification
Subject to change without notification
18
3.5.2 Setting Velocity via Pulse Train
This mode is selected via the commands
contmod
and
sor 2
. The drive interprets the pulse
train input to AUXin as a speed preset, in which 1 Hz corresponds exactly to 1 RPM. If the
frequency of this input signal changes too rapidly, the drive will accelerate or decelerate only
at the maximum rates permitted by the ramps (cf section
3.5.3
). It behaves in exactly the same
way as when working with the analog voltage presets. In such a case, steps will be lost, which
cannot be compensated for again. Due to the constraints of the permitted acceleration ramps,
this mode is accurate as regards speed, but not precise as regards position.
Example:
The commands
contmod
,
sor 2
and
adr
are entered. At the control input a 10-second
rectangular pulse is applied at a frequency of 10 kHz. The drive will accelerate slowly to 10 000
RPM. After 10 seconds the signal has disappeared, and the drive slows down again to standstill.
With the command
stw
, the pulse-width can be set up in line with analog pulses, based on
the following formula:
v [rpm] = stw
•
input frequency [Hz]
Using
stw
3 a 200 Hz pulse train corresponds to a speed of 600 rpm.
The direction of rotation is preset via
adr
and
adl
.
C
ommand
Function
Description
sor
Source For Velocity Source for rotational speed preset
sor 0
: desired speed via RS-232 (v-command)
sor 1
: desired speed via voltage at analog input
sor 2
: desired speed via pulse train at AUXin
contmod
Continuous Mode Change back from an extended mode to
normal operation (desired condition value
via RS-232)
stw
Step Width Multiplication factor (pulse width) according
to pulse
adl
Analog Direction Left Direction of rotation to the left
adr
Analog Direction Right Direction of rotation to the right
