Appendix
A.5 Acceptance Log
Control Units CU240S
Operating Instructions, 11/2006, A5E00766042B AA
A-11
Function test "Safe Torque Off" (STO)
This test comprises the following steps:
Table A-8 "Safe Torque Off" function (STO)
No. Description Status
1. Initial state
• Drive in the "ready" state (P0010 = 0)
• No safety faults and alarms
• r9772.0 = r9772.1 = 0 (STO de-selected and inactive)
• P9659 = time intervals for the forced checking procedure correctly set
2. Operate the drive
3. Check that the expected drive operates
4. Select STO while issuing the command to operate
5. Check the following:
• The drive coasts-down
• The drive is braked by the mechanical brake and held if a brake is being
used
• No safety faults
• r9772.0 = r9772.1 = 1 (STO selected and active), r9772.14 = 1 if Safe
Brake Control is enabled
6. De-select STO
7. Check the following:
• No safety faults
• r9772.0 = r9772.1 = 0 (STO de-selected and inactive) , r9772.14 = 0
8. Check that the expected drive operates if so the following is tested:
• That the wiring between the control unit and power module is correct
• Correct assignment, drive No. – inverter power module – motor
• That the hardware is correctly functioning
• That the shutdown paths have been correctly wired
• Correct assignment of the STO terminals on the control unit
• Correct parameterization of the STO function
• Routine for the forced checking procedure of the shutdown paths
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