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4
Function Description
4.3
Safety functions
4- Funkt_Sicherheitsfunktion_Allg
Safety functions
4300
Safety functions
4.3
Funkt_Sicherheitsfunktion_Basis
Funkt_Sicherheitsfunktion_SBC
Funkt_Sicherheitsfunktion_SBT
Funkt_Sicherheitsfunktion_Eing
Funkt_Sicherheitsfunktion_Rueck
Funkt_Sicherheitsfunktion_Kombi
Funkt_Sicherheitsfunktion_Fehler
4-8
Safety functions maintain a safe condition on a plant or prevent hazard-
ous conditions arising on a plant.
The safety functions for electrical drives are defined in EN 61800-5-2.
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)
Safe brake control (SBC)
Safe brake test (SBT) (not defined in EN 61800-5-2)
Activation of safety functions
The safety functions are activated using the single-pole 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 func-
tions via a 1/0 pulse edge.
Feedback from the safety functions
Message via single-pole 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 config-
uration.
During this time, no other safety functions may be processed or called
up.
Reaction to limit value violations and errors
When set limit values are exceeded, the E-STOP braking ramp is ac-
tivated.
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.
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