Functions
8.24 Open-loop and closed-loop control
Control Units CU240S
Operating Instructions, 11/2006, A5E00766042B AA
8-183
8.24.2.6 Limiting the torque setpoint
Data
P1520 … P1531
P0640, r0067
Parameter range:
r1407 bit 08, r1407 bit 09
Warnings: -
Faults: -
Function chart number: FP7700, FP7710 (CU240S)
Description
All of the following limits act on the torque setpoint which is either entered at the speed
controller output for closed-loop speed control or as torque input for closed-loop torque
control. The minimum is used from the various limits. This minimum is cyclically computed in
the inverter and displayed in parameters r1538, r1539.
● r1538 Upper torque limit
● r1539 Lower torque limit
This means that these cyclic values limit the torque setpoint at the speed controller
output/torque input and indicate the instantaneously maximum possible torque. If the torque
setpoint is limited in the inverter, then this is displayed using the following diagnostic
parameters
● r1407 bit 08 Upper torque limit active
● r1407 bit 09 Lower torque limit active
Torque limiting
The value specifies the maximum permissible torque whereby different limits are
parameterizable for motoring and regenerative operation.
● P1520 CO: Upper torque limit value
● P1521 CO: Lower torque limit value
● P1522 CI: Upper torque limit value
● P1523 CI: Lower torque limit value
● P1525 Scaling, lower torque limit value
The currently active torque limit values are displayed in the following parameters:
● r1526 CO: Upper torque limit value
● r1527 CO: Lower torque limit value
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