Functions
8.18 Fail-safe functions
Control Units CU240S
Operating Instructions, 11/2006, A5E00766042B AA
8-107
8.18.3 Safe Torque Off
Data
Parameter range: P0003, P0010
P09761
P9603/P9803, Bit 04, Bit 05 or Bit 07 (PROFIsafe)
P9690/P9890
P9691/P9891
P9692/P9892
P9799/P9899/P3900
Warnings A1691, A1692, A1696, A1699
Faults F1600, F1616
Description
Safe Torque Off (STO) is the simplest fail-safe function and its purpose is to shutdown the
motor safely. Once the motor is at a standstill, STO then enables a switch-on lock which
prevents the inverter from starting the motor, unless the STO signal is removed. Shutting
down of the triggering pulses on the Power Module effectively stops the motor and should a
mechanical brake be connected, it will be closed immediately.
When the STO function is initiated the inverter performs the following actions:
1. The triggering pulses on the Power Module are disabled.
2. The mechanical brake (if connected) is closed immediately.
3. The status LED STO starts flashing.
4. The status LED ES is switched on, indicating the end-of-state has been reached.
When the STO signal is removed the inverter performs the following actions:
1. The process dynamisation is carried out (always).
2. The forced dynamisation procedure is carried out (if parameterised by p9601 and p9801).
3. The forced dynamisation timer (p9660) is reset to the value in p9659 (if the forced
dynamisation procedure was carried out successfully).
4. The mechanical brake is opened (if connected), if not closed by holding brake function
(P1215).
5. The status LED STO is switched on and ES is switched off.
6. The pulse-lock must be released by applying a rising edge signal (OFF1/ON).
These actions are shown in the figure below.
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