Setup of the safety functions

../../../../../_images/safety_node_connectors.png

Attention

For SIL 3, PL e, cat.3 it is required to send test pulses from the PLC to the output or to ensure fault exclusion for wiring “Short circuit between any two conductors” according to ISO 13849-2:2012 between signals STO-SBC 1 and STO-SBC 2

  • permanently connected (fixed) and protected against external damage, e.g. by cable ducting, armouring, OR

  • separate multicore cables, OR

  • within an electrical enclosure, OR

  • individually shielded with earth connection.

Connecting the STO/SBC inputs

STO/SBC input port

../../../../../_images/STO-SBC-input.png ../../../../../_images/STO-SBC_Details.png

Pin#

Designation

Function

Description

1

BY+

Bypass+

Connect to BY- (Pin 6) to bypass STO/SBC

2

IN1

STO/SBC input 1

Input 1 for STO/SBC

3

IN1

STO/SBC input 1

Extra Pin for Input 1

4

IN2

STO/SBC input 2

Input 2 for STO/SBC

5

GND

Safety GND

Must be isolated from main Ground

6

BY-

Bypass-

Connect to BY+ (Pin 1) to bypass STO/SBC

Wiring examples for the STO/SBC inputs

The wiring differs depending on the safety device used:

  • Manual switch covers any emergency device that can be connected directly to the safety input of the servo drive.

  • If safety PLCs are used it is important to distinguish between plus-plus and plus-minus logic

    • PLCs using plus-plus logic must be connected to both inputs for redundancy

    • PLCs using plus-minus logic are only connected to the input 1 which must be bridged to input 2. The redundant channel in this case is the pulsed safety ground signal.

Important

Please note that Safety GND is an isolated signal from drive GND.

Manual switch

Allows safety functions up to SIL 3, PL e, cat.3.

../../../../../_images/STO-SBC_switch.png

Safety PLC (plus-minus output)

Allows safety functions up to SIL 3, PL e, cat.3.

Note

Safety GND functions as a secondary line when a PLC with plus-minus output is used.

../../../../../_images/STO-SBC_PLC_PM1.png

Attention

In case of multiple drive connection, ensure that the output driver has sufficient current driving capability.

Safety PLC (plus-plus output)

Allows safety functions up to SIL 3, PL e, cat.3.

For example: Safety PLC output or safety sensors (e.g. Safety light curtain, safety scanner etc.)

../../../../../_images/STO-SBC_PLC_PP1.png

Attention

In case of multiple drive connection, ensure that the output driver has sufficient current driving capability.

Connection diagram for the brake

Attention

Phase D can’t be used for connecting a brake when Node Safety is used:

  • use the safety brake connector of the safety circuit (SBC out) instead of phase D of the drive circuit.

  • ensure to connect the brake GND signal to the Brake- signal of the safety circuit (SBC out) instead of the general GND.

Brake power output (STO/SBC)

../../../../../_images/SBC-out.png ../../../../../_images/STO-SBC_wiring_brake2.png

Pin #

Designation

Function

1

+

Brake +

2

-

Brake -

Note

The safe brake is PWM based and can be configured with the regular brake object.

Connector mating parts and cable lengths

Connector description

Manufacturer

Mating part number

Crimping Contact

Cable

Safe brake port

JST

ZER-02V-S

SZE-002T-P0.3

0.08-0.21 mm² / 28-24 AWG

Safe digital I/O port

JST

GHR-06V-S

SSHL-002T-P0.2

0.05-0.13mm² / AWG 30-26

Please observe the maximum allowed cable lengths:

Connection

Maximum wire length

STO-SBC

30 m