Siemens SINAMICS S120 Function Manual page 61

S Initial rounding-off time IR
S Final rounding-off time FR
S Rounding-off type
S Effective ramp-up time
Tup_eff = Tup + (IR/2 + FR/2)
S Effective ramp-down time
Tdn_eff = Tdn + (IR/2 + FR/2)
S OFF 3 deceleration ramp
– OFF3 ramp-down time
– OFF3 initial rounding-off time
– OFF3 final rounding-off time
S Set ramp-function generator
– Ramp-function generator setting value
– Set ramp-function generator signal
S Ramp-function generator rounding-off type
– p1134 = "0": Rounding is always active. Can result in overshoot.
– p1134 = "1": Final rounding-off is not active if the input word is reduced
abruptly during ramp-up.
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 gene-
rator 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
Fig. 2-14 Ramp-function generator tracking
© Siemens AG 2006 All Rights Reserved
SINAMICS S120 Function Manual, 03/2006 Edition
Output of
ramp-function generator
t1 t2
Extended Setpoint Channel
Extended setpoint channel
p1130[D]
p1131[D]
p1134[D]
p1135[D]
p1136[D]
p1137[D]
p1144[C]
p1143[C]
p1134[D]
With tracking
Speed Setpoint
n
p1145
Actual speed
Output of
ramp-function generator
t1 t2
2-61