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If SYMMETRIC = TRUE then this value will be used only for the first
acceleration segment.
JERK 2
Rate of change of acceleration in units of percent per second
3
for segment
2. Only applicable if SYMMETRIC = FALSE.
JERK 3
Rate of change of acceleration in units of percent per second
3
for segment
3. Only applicable if SYMMETRIC = FALSE.
JERK 4
Rate of change of acceleration in units of percent per second
3
for segment
4. Only applicable if SYMMETRIC = FALSE.
QUENCH
If TRUE forces the ramp input to zero.
AT SPEED
Diagnostic output indicating the abs (input - output) is less than AT
SPEED LEVEL.
AT SPEED LEVEL
Threshold for AT SPEED diagnostic output.
ACCEL O/P
Reserved.
OVERSHOOT THRESH
Reserved.
ERROR THRESHOLD
Reserved, hysterisis level before s-ramp operates.
OUTPUT
Diagnostic, ramp output.
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Note: These only hold true is Jerk = Jerk2 for acceleration or Jerk 3 = Jerk 4 for deceleration.
V is the maximum speed the drive must reach. In % / sec
A is the maximum allowable acceleration in %/sec
2
J is the maximum allowable value for jerk, in %/sec
3
The time needed to stop or accelerate is:
t
V
A
A
J
=
+
[Seconds]
as the speed is symmetrical the average speed is V/2, therefore the stopping / acceleration distance can be
calculated.
s
V V
A
A
J
=
+
2
[Meters]
S-Ramp
-30
0
1
20
30
40
50
60
Time (secs)
%
Jerk 3
Jerk 4
Jerk 2
Jerk
Acceleration
Deceleration
Figure 5.21 S-Ramp
Example acceleration graph for a velocity 60 %/s max. Acceleration of 20 %/s
2
and a jerk of 10 %/s
3
This manual was downloaded on www.sdsdrives.com
+44 (0)117 938 1800 - info@sdsdrives.com