VLT
®
5000 SyncPos option
MG.10.J4.02 – VLT is a registered Danfoss trade mark
104
Software Reference
■■
■■
■ PULSACC
With PULSACC it is possible to set the accelera-
tion/deceleration for the virtual master (encoder
output).
The virtual master signal simulates an encoder
signal. To calculate the pulse acceleration
PULSACC the parameters
Encoder resolutionEncoder resolution
Encoder resolutionEncoder resolution
Encoder resolution,
master velocity and the ramp times must be taken
into consideration.
Example:
The virtual master signal should correspond to an
encoder signal of 1024 counts/revolution. The ma-
ximum speed of 25 encoder revolutions/s should
be achieved in 1 s.
PULSACC =
pulse velocity (PULSVEL) [Hz]
t[s]
25 · 1024 counts/turn
=
1s
counts
s
= 25600
= 25600
counts Hz
S
2
S
The signals generated are evaluated simultaneous-
ly as master input so that MAPOS, MIPOS etc.
function as they would in an external master.
PULSACC = 0 is the condition for switching off the
virtual master mode.
NB!
Changes in the acceleration in PULSACC
are only valid after the next PULSVEL
command.
Summary
Set acceleration for the virtual master
Syntax
PULSACC a
Parameter
a = acceleration in Hz/sec
Command group
SYN
Cross Index
PULSVEL
■■
■■
■ PULSVEL
With PULSVEL it is possible to set the velocity for
the virtual master (encoder output).
The virtual master signal simulates an encoder
signal. To calculate the pulse velocity the
parameters
Encoder resolutionEncoder resolution
Encoder resolutionEncoder resolution
Encoder resolution and master velocity
must be taken into consideration.
Example:
The virtual master signal should correspond to an
encoder signal of 2048 counts /revolution within a
encoder speed of 50 revolutions/sec.
PULSVEL = encoder counts per turn ·
turns
S
= 2048 · 50 Hz = 102400 Hz
Summary
Set the velocity for the virtual master
Syntax
PULSVEL v
Parameter
v = velocity in pulses per second (Hz)
Command group
SYN
Cross Index
PULSACC
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