Functions
8.18 Fail-safe functions
Control Units CU240S
8-124 Operating Instructions, 11/2006, A5E00766042B AA
Note
It must be observed that with detecting a fault during the fail-safe function SLS mode 0 is
active, first it will be tryed to brake the drive at the safe brake ramp.
The brake time is determined by parameters P9681/P9881. As the drive at this time is in a
fail-safe mode, it is not possible to interrupt the braking ramp by an other function (e.g. STO).
It is recommended to parameterise the shortest possible ramp time for the application.
SLS Mode 1
P9692 = P9892 = 1
In addition to the speed limit set in parameters P9691 and P9891, a further SLS setpoint can
be set in parameters P9690 and P9890. This additional SLS setpoint is used to set the
speed of the motor to a specific frequency, instead of bringing the motor to a standstill.
If the actual speed of the motor falls below the SLS setpoint set in P9690 and P9890, the
motor is allowed to run at that speed. See the following table.
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