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4.3 Safety functions
4 Function Description
4-30
4.3.8 Safe brake control - SBC
Safe฀brake฀control฀-฀SBC 4- Sicherheitsfunktion_SBC_Ueber
The฀safety฀function฀"safe฀brake฀control"฀(SBC)฀is฀used฀to฀control฀external฀
brakes.
Features฀of฀the฀safety฀function:

After฀executing฀safety฀functions฀STO฀and฀SS1,฀an฀additional฀mechan-
ical฀brake฀is฀required฀to฀eliminate฀hazards,฀particularly฀where฀external฀
forces฀influence฀the฀motor฀axis฀(e.g.฀suspended฀loads).

The฀internal฀motor฀brake฀is฀controlled฀directly฀from฀the฀servo฀amplifier฀
when฀the฀motor฀is฀switched฀on/off.

An฀external฀mechanical฀brake฀is฀controlled฀via฀the฀2-pole฀output฀
"SBC+/SBC-"฀on฀the฀safety฀card.

Safety฀function฀SBC฀is฀activated฀in฀conjunction฀with฀safety฀function฀
STO.฀SBC฀must฀be฀activated฀in฀the฀Configurator฀for฀this฀purpose.
Sicherheitsfunktion_SBC_Wichtig
Sicherheitsfunktion_Sxx_Voraussetzung_S1
Prerequisites฀for฀normal฀operation:฀

Input฀"SS1฀Activate"฀and฀"SS1฀SIL3/Reset":฀"1"฀Signal฀(+24฀VDC)

"Ready"฀output:฀"1"฀Signal฀(+24฀VDC).฀The฀safety฀card฀is฀ready฀for฀op-
eration.

"STO฀Acknowledge"฀output:฀“0”฀Signal
Sicherheitsfunktion_SBC_SBT_Voraussetzung

Output฀"SBC+/SBC-":฀"1"฀Signal฀(+24฀VDC)

Both฀outputs฀are฀simultaneously฀set฀to฀a฀"1"฀Signal:฀Voltage฀differ-
ence฀of฀24 V฀between฀SBC+฀and฀SBC-.
Sicherheitsfunktion_Sxx_Voraussetzung_SIL3

To฀achieve฀SIL3฀or฀Ple:฀Connect฀the฀output฀"STO฀SIL3"฀to฀servo฀am-
plifier฀terminal฀X4A/฀3.
Sicherheitsfunktion_SBC_Ausloesung
Safety฀function฀is฀activated฀

Safety฀function฀STO
Sicherheitsfunktion_SBC_Reaktion
Reaction:

Output฀"SBC+/SBC-":฀"0"฀Signal฀(0฀VDC)

Both฀outputs฀are฀simultaneously฀set฀to฀a฀"0"฀Signal:฀Voltage฀differ-
ence฀of฀0 V฀between฀SBC+฀and฀SBC-.
Sicherheitsfunktion_SBC_S1_Diagramm
NOTICE
Please฀note:฀when฀using฀a฀safe฀holding฀brake฀on฀vertical฀axes,฀a฀
motor฀brake฀must฀be฀available.