Pilz PMCprimo DriveP.06/AA0/4/0/0/208-480VAC - Manual (Page 19)

Function description
Operating Manual PMCprotego S2­2(­C)
1002529­EN­02 19
4.3 Safety functions
Safety functions maintain a safe condition on a plant or prevent hazardous conditions
arising on a plant.
The safety functions for electrical drives are defined in EN 61800­5­2.
The safety card implements the following safety functions:
} Safe stop 1 (SS1)
} Safe stop 2 (SS2)
} Safe operating stop (SOS)
} Safe speed range (SSR)
} Safely limited speed (SLS)
} Safe direction (SDI)
} Safely Limited Increment (SLI)
Activation of safety functions
} The safety functions are activated using the single­pole safe inputs on the safety card.
} These inputs operate in accordance with the failsafe principle (on switching off). The
safety control system activates the safety functions via a 1/0 pulse edge.
Feedback from the safety functions
} Message via single­pole semiconductor outputs
– “1” Signal: Inside the set limit values
– “0” Signal: Outside the set limit values
Simultaneous activation of safety functions
} All safety functions can be active at the same time. However, safety function SS1 has
priority over all other safety functions.
} If SS1 is activated, the drive is stopped in accordance with its configuration.
} No other safety functions are processed or called up during this time.
Reaction to limit value violations and errors
} When set limit values are exceeded, the E­STOP braking ramp is activated.
} The safety function STO is activated if there are any internal errors on the safety card
or servo amplifier. The power element is switched off.
4.3.1 Safe torque off ­ STO
The safety function "Safe Torque Off" (STO) removes the power to the motor. It is imple­
mented via the servo amplifier's shutdown path and the safety card's safe outputs.
Features of the safety function:
} The motor becomes torque­free and no longer generates any hazardous movements.
} To prevent the drive running down in an uncontrolled manner, in normal operation the
safety function STO is activated via the safety function SS1.
} STO is only activated directly when
– there is an internal error on the servo amplifier or safety card
– the STO delay time is set to 0