Siemens SINAMICS S120 Function Manual page 61

Ramp-function generator tracking
Ramp-function generator tracking allows the speed setpoint to be corrected in line
with the actual speed value. p1145 can be used to deactivate ramp-function gener-
ator tracking (p1145 = 0) or set the permissible following error (p1145 > 0). If the
permissible following error is exceeded, the minimum speed is defaulted that re-
sults in the maximum torque.
Ramp-function generator tracking can be activated for the simple and the extended
ramp-function generators.
Without tracking
Speed setpoint
--{}--n
Actual speed value
Fig. 2-14 Ramp-function generator tracking
Without ramp-function generator tracking
S p1145 = 0
S Drive accelerates until t2 although setpoint < actual value
With ramp-function generator tracking
S p1145 > 0
S Ramp-function generator output leads setpoint by only a small margin
S t1 and t2 almost identical
Function diagram overview (see List Manual)
S 1550
S 3060
S 3070
S 3080
Signal overview (see List Manual)
S Control signal STW1.2
S Control signal STW1.4
S Control signal STW1.5
© Siemens AG, 2005. All rights reserved
SINAMICS S120 Function Manual, 06/05 Edition
Output of
ramp- -fct. generator
t1 t2
Setpoint channel
Simple ramp-function generator
Extended ramp-function generator
Ramp-function generator selection, status word, tracking
OFF3
Enable ramp-function generator
Start/stop ramp-function generator
Extended Setpoint Channel
Extended setpoint channel
With tracking
Speed setpoint
--{}--n
p1145
Actual speed value
Output of
ramp- -fct. generator
t1 t2
hlg_nachfuehrung.vsd
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