Function Description
Operating Manual PMCprotego D.48, PMCprotego D.72
1001735-EN-04
42
Safety function STO, digital inputs STO1-ENABLE (X4/7), STO2-ENABLE (X4/5)
The two digital inputs STO1-ENABLE (1st shutdown route) and STO2-ENABLE (2nd shut-
down route) are used to shut down the inverted rectifier safely.
Functions when operated without a safety card:
} The digital inputs STO1-ENABLE and STO2-ENABLE enable the inverted rectifier on
the servo amplifier.
} Single or dual-channel activation of the safety function STO is possible.
} The servo amplifier is ready for operation when there is a 24 V signal at the inputs.
} If the STO1-ENABLE and/or STO2-ENABLE input is open, no more power is trans-
ferred to the motor. The drive becomes torque-free and runs down.
} In conjunction with the output from a safety relay or safety control system, you can
safely prevent the drive from restarting.
} Requirements of the outputs on a safety control system or safety relay:
– Single-channel activation of STO without feedback: PL d (Cat. 2) of
ENISO13849-1, SILCL2 of EN/IEC62061
– Dual-channel activation of STO with feedback: PL e (Cat. 4) of ENISO13849-1,
SILCL3 of EN/IEC62061
} If the safety function STO is not needed, STO1-ENABLE and STO2-ENABLE must be
connected directly to 24V.
} Volt-free, reference earth is XGND
Functions when operated with a safety card:
} PL e (Cat.4) and SIL CL 3 can be achieved.
} Volt-free, reference earth is XGND
} STO1-ENABLE
The input STO1-ENABLE is not active, so does not need to be wired.
} STO2-ENABLE
– If the STO2-ENABLE input is open, no more power is transferred to the motor. The
drive becomes torque-free and runs down.
– STO single-channel with safety card PMCprotegoS1 or PMCprotegoS2:
The input STO2-ENABLE must be connected directly to 24V. The 2nd shutdown
route is not needed.
– STO dual-channel with safety card PMCprotegoS1:
The input STO2-ENABLE must be connected to the output STOSIL3 on the safety
card.
– If the safety function STO is not needed, STO2-ENABLE must be connected dir-
ectly to 24V.
INFORMATION
Further information is available in the section entitled “Safety function STO”.
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