Functions
8.18 Fail-safe functions
Control Units CU240S
Operating Instructions, 11/2006, A5E00766042B AA
8-109
Latched Safe Torque Off (LSTO)
The latched safe torque off (LSTO) is always initiated when a detected fault requires, that the
drive must be brought to a standstill. The drive can be returned to operation only when the
fault has been explicitly acknowledged and a forced dynamisation procedure has been
carried out.
The latched safe torque off state is left by the following procedure:
1. Turning the drive off by sending an OFF1-signal.
2. Acknowledging all active faults.
3. Sending an ON-signal after the dynamisation procedure was carried out successfully.
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Figure 8-71 Latched safe torque off function
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