Torque Limiting - Siemens SINAMICS S120 Function Manual

Vector control

4.8 Torque limiting

4.8 Torque limiting
Description
Figure 4-12
The value specifies the maximum permissible torque whereby different limits can be
parameterized for motor and regenerative mode.
● p0640[0...n] Current limit
● p1520[0...n] CO: Torque limit, upper/motoring
● p1521[0...n] CO: Torque limit, lower/regenerative
● p1522[0...n] CI: Torque limit, upper/motoring
● p1523[0...n] CI: Torque limit, lower/regenerative
● p1524[0...n] CO: Torque limit, upper/motoring, scaling
● p1525[0...n] CO: Torque limit, lower/regenerating scaling
● p1530[0...n] Motor mode power limit
● p1531[0...n] Regenerative mode power limit
The current active torque limit values are displayed in the following parameters:
● r0067 Maximum drive output current
● r1526 Torque limit, upper/motoring without offset
● r1527 Torque limit, lower/regenerative without offset
The following limits all apply to the torque setpoint, which is present either at the speed
controller output in the case of speed control, or at the torque input in the case of torque
control. The minimum/maximum value of the different limits is used in each case. The
minimum value is calculated cyclically and displayed in parameters r1538 and r1539.
● r1538 CO: Upper effective torque limit
● r1539 CO: Lower effective torque limit
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Torque limiting
These cyclical values therefore limit the torque setpoint at the speed controller
output/torque input or indicate the instantaneous max. possible torque. If the torque
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
Drive Functions