Table of Contents
Advertisement
Setpoint channel and closed-loop control
7.4 Vector speed/torque control with/without an encoder
The total of the two torque setpoints is limited in the same way as the speed control torque
setpoint. Above the maximum speed (p1082), a speed limiting controller reduces the torque
limits in order to prevent the drive from accelerating any further.
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). For this reason, encoderless
torque control at standstill is only suitable for applications that require an accelerating torque
but no load torque (e.g. traction 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
– The drive is immediately braked along the OFF3 down ramp (p1135) when n_set = 0
– 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.
482
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.
is entered.
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.
Operating Instructions, 12/2018, A5E36652151A
Enclosed Drives
Advertisement
Table of Contents
