Function description
Operating Manual PMCprotego S2-2(-C)
1002529-EN-04
20
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the STO delay time is set to 0
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the inputs "SS1 Activate" and "Reset" simultaneously switch to a "0" signal
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The STO-ENABLE reset lock on the servo amplifier has no function if the servo ampli-
fier contains a safety card. The output contact is linked internally. In this case, the
safety card activates the safe pulse disabler on the servo amplifier in order to shut
down the power element.
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The safety function "Safe Torque Off" corresponds to a category 0 stop (uncontrolled
stop) in accordance with EN 60204-1.
Prerequisites for normal operation:
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Input "SS1 Activate" and "Reset": "1" Signal (+24 VDC)
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"Ready" output: "1" Signal (+24 VDC). The safety card is ready for operation.
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"STO Acknowledge" output: “0” Signal
Safety function is activated
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By an error after limit values have been exceeded or
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By an internal error on the safety card or servo amplifier, if the drive can no longer be
braked safely
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By executing the safety function SS1 (1/0 pulse edge). In this case the drive is braked
safely before it is switched to torque-free (see section: "Safe stop – SS1").
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The inputs "SS1 Activate" and "Reset" simultaneously switch to a "0" signal
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A second error occurs while SS1 (drive shutdown) is activated.
Reaction:
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The drive is switched to torque-free
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"STO Acknowledge" output: “1” Signal
If any external forces influence the motor axis (e.g. suspended loads), additional measures
(e.g. a safety holding brake) are required in order to eliminate hazards.
