Functions
8.24 Open-loop and closed-loop control
Control Units CU240S
8-182 Operating Instructions, 11/2006, A5E00766042B AA
8.24.2.5 Switch-over from Frequency to Torque Control
Data
Parameter range: P1300, P1501
Warnings: -
Faults: -
Function chart number: -
Description
Caution
Don't use SS1 or SLS in conjunction with Closed-loop torque control
Closed-loop torque control should not be used in conjunction with the failsafe functions SS1
and SLS, because the speed ramp functions, necesarry for SS1 and SLS are not available
together with the closed-loop torque control. So, if activating SS1 or SLS in case of Closed-
loop torque control, an LSTO will be generated immediately (after the time set in P9680 has
been passed) if the actual frequency exeeds the safety envelope.
The STO can be used with Closed-loop torque control without any restrictions.
The closed-loop torque control is switched-on via parameter P1501 during operation or
selected with parameter P1300 = 22, 23.
Table 8-36 Closed-loop torque control
Control mode P1501 = ON
P1300 = 20, 21 OFF1 command is not recognized. Closed-loop
speed control
+ fail-safe functions SLS, SS1 A safety fault is generated when the actual
frequency leaves the safety envelope.
P1300 = 22, 23 OFF1 command recognized as OFF2. Closed-loop
torque control
+ fail-safe functions SLS, SS1 A safety fault is generated when the actual
frequency leaves the safety envelope.
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