Programming
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D Page D-147
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E
VIRTUAL MASTER
SETUP::PHASE CONTROL::VIRTUAL MASTER
This block transmits a regular update of speed, position and acceleration to all other drives listening on the selected channel.
The output is profiled by the ACCELERATION, DECELERATION and JERK 1-4 parameters.
Refer to REFERENCE RAMP, page D-
106.
An example acceleration graph for a velocity 60 %/s maximum, acceleration of 20 %/s
2
and a jerk of 10 %/s
3
is shown below.
Parameter Descriptions
CHANNEL
PREF: 118.17 Default: 0 Range: 0 to 64
This parameter sets the Firewire channel that the Virtual Master broadcasts references on.
INPUT
PREF: 118.01 Default: 0.00 % Range: -100.00 to 100.00 %
Ramp input.
ACCELERATION
PREF: 118.02 Default: 10.00 /s² Range: 0.00 to 100.00 /s²
Sets the acceleration rate in units of percent per second², i.e. if the full speed of the machine is 1.25m/s then the acceleration
will be: 1.25 x 75.00% = 0.9375m/s²
DECELERATION
PREF: 118.03 Default: 10.00 /s² Range: 0.00 to 100.00 /s²
This functions in the same way as ACCELERATION above.
JERK 1 to JERK 4
PREF: 118.04, 118.05,
118.06, 118.07
Default: 10.00 /s² Range: 0.00 to 100.00 /s
3
Rate of change of acceleration for the relevant segment of the curve, i.e. JERK 1 is for segment 1, etc.
CONTINUOUS
PREF: 118.08 Default: FALSE Range: FALSE / TRUE
When TRUE, it forces a smooth transition if the speed point is changed when ramping. The curve is controlled by the
ACCELERATION and JERK 1 to JERK 4 parameters. When FALSE, there is an immediate transition from the old curve to
the new curve.
HOLD
PREF: 118.09 Default: FALSE Range: FALSE / TRUE
When TRUE, the output of the ramp is held at its last value.
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