Appendix: Safe Torque Off (STO) 201
Restarting the drive
Restarting the drive is not part of the STO test or certification processes, but is
included here for convenience.
Action
Deactivate the STO circuit (apply power to the STO inputs).
If the drive holds a Mint program, or is connected to an Ether
net master device that can
enable the drive, it is possible for the drive to restart and begin to control the motor without
further intervention. If the drive does not hold a Mint program, some of the following actions
are necessary, depending on the installation:
• Activate the additional drive
enable input (if present).
• In Mint WorkBench (if connected), click the Clear
errors button on the System toolbar,
followed by the Drive Enable button on the Motion toolbar.
• Enable the drive from the Ethernet master
device (if connected).
Maintenance / servicing
Include the STO operation tests described in Start-up, acceptance, and proof test
interval checklist on page 200 in the routine maintenance program of the machinery
to which the drive is connected.
The STO function must be tested by authorized service
personnel as frequently as
required by the proof test interval T
1
; see Start-up, acceptance, and proof test interval
checklist on page 200. See also Data related to safety standards on page 206.
The STO input terminals do not need any maintenance. Maintain the drive according
to th
e instructions given in this manual.
The exchange of safety related systems or sub
systems must be performed only in a
powerless condition.
The drive may only be
opened by ABB authorized personnel.
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