Siemens SINAMICS G150 Operating Instructions Manual page 461

A "real" closed-loop torque control (with a speed that automatically sets itself) is only
possible in the closed-loop control range but not in the open-loop control range of the
sensorless closed-loop vector control. In the open-loop controlled range, the torque setpoint
changes the setpoint speed via a ramp-up integrator (integrating time ~ p1499 x p0341 x
p0342). This is the reason that sensorless closed-loop torque control close to standstill is
only suitable for applications that require an accelerating torque there and no load torque
(e.g. traversing drives). Closed-loop torque control with encoder does not have this
restriction.
OFF responses
● OFF1 and p1300 = 22, 23
– Response as for OFF2
● OFF1, p1501 = "1" signal and p1300 ≠ 22, 23
– No separate braking response; the braking response is provided by a drive that
– The pulses are inhibited when the brake application time (p1217) expires. Standstill is
– Switching on inhibited is activated.
● OFF2
– Immediate pulse suppression, the drive coasts to standstill.
– The motor brake (if parameterized) is closed immediately.
– Switching on inhibited is activated.
● OFF3
– Switch to speed-controlled operation
– n_set = 0 is input immediately to brake the drive along the OFF3 deceleration ramp
– When standstill is detected, the motor brake (if parameterized) is closed.
– The pulses are inhibited when the motor brake closing time (p1217) has elapsed.
– Switching on inhibited is activated.
Function diagram
FP 6060
Converter cabinet units
Operating Instructions, 07/2016, A5E03347396A
specifies the torque.
detected when the speed actual value of the speed threshold (p1226) is undershot or
when the monitoring time (p1227) started when speed setpoint ≤ speed threshold
(p1226) expires.
(p1135).
Standstill is detected when the speed actual value of the speed threshold (p1226) is
undershot or when the monitoring time (p1227) started when speed setpoint ≤ speed
threshold (p1226) expires.
Torque setpoint
Setpoint channel and closed-loop control
7.4 Vector speed/torque control with/without encoder
461