Efficient Networks S120 manual Enabling the Safe Torque Off STO function

Safety Integrated basic functions 9.3 Safe Torque Off (STO)

CAUTION

If two power transistors in the power unit (one in the upper and one offset in the lower inverter bridge) fail at the same time, this can cause a momentary movement.

The maximum movement can be:

Synchronous rotary motors: max. movement = 180° / no. of pole pairs

Synchronous linear motors: max. movement = pole width

● The status of the "Safe Torque Off" function is displayed using parameters.

Enabling the "Safe Torque Off (STO)" function

The "Safe Torque Off" function is enabled via the following parameters:

NOTICE

It is not possible to activate the control via TM54F and PROFIsafe at the same time.

●STO via terminals:

–p9601.0 = 1, p9801.0 = 1

●STO via TM54F (only with "Extended Functions" option):

–p9601.2 = 1, p9801.2 = 1

–p9601.3 = 0, p9801.3 = 0

●STO via PROFIsafe (only with "Extended Functions" option):

–p9601.2 = 1, p9801.2 = 1

–p9601.3 = 1, p9801.3 = 1

Selecting/deselecting "Safe Torque Off"

The following occurs when "Safe Torque Off" is selected:

●Each monitoring channel triggers safe pulse suppression via its switch-off signal path.

●A motor holding brake is applied (if connected and configured).

The following occurs when "Safe Torque Off" is de-selected:

●Each monitoring channel cancels safe pulse suppression via its switch-off signal path.

●The safety prompt "Apply motor holding brake" is canceled.

●Any pending STOP F or STOP A commands are canceled (see r9772/r9872).

Note

If "Safe Torque Off" is de-selected and selected again through one channel within the time in p9650/p9850, the pulses are canceled but a signal is not output.

If you want a message to be displayed in this case, however, you have to reconfigure N01620/N30620 via p2118 and p2119 as an alarm or fault.

Drive Functions	309
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4