Nord-drivesystems BU0530 User Manual download pdf (Page 23)

2 Description of function

BU 0530 GB-3712 23

2.3 Examples / Implementation

The following illustrates several examples of solutions for the safety functions STO and SS1.

2.3.1 STO function

Normally, a protective switching device is used to implement a safety function. The safety category of the

function is determined by the component with the lowest category.

In this example, Safety Category 4 as per DIN ISO 13849-1 can be achieved. The prerequisite for this is that

the emergency stop button, the protective switching device and the wiring fulfil the requirements for Category

4. For example, this can be achieved as follows:

 Redundant protective switching device with self-monitoring

 Dual-channel input circuit with short-circuit recognition (and appropriate emergency stop button)

 Safety output with periodic switch-off tests (OSSD)

 Elimination of errors as per DIN ISO 13849-2 for the wiring between the switching device and the input

terminals of the safe shut-down method used, by the use of a shielded cable and connection of the

shield at both ends.

NOTE

If the "Safe pulse block" triggers for an enabled frequency inverter, error E018 (18.0 safety

circuit) is triggered.

The typical reaction time can be reduced by the additional use of a digital input (e.g.: DIN1), which must be

parameterised for the function "Block voltage":

Note: The optional filter on the digital input is only required in environments with heavy interference.

A second safety output is required to control the digital input.

DIN1

GND

GND SH

24V SH

24V

Frequency inverter

Use of the

"Safe pulse block"

Reset

Emergency stop button

Reset circuit

Safety output 1

Safety output 2

Supply voltage

Input circuit

with short-

circuit detection

Shielded cable to

eliminate errors as per

DIN EN ISO 13849-2

Filter

for

OSSD

optional

GND SH

24V SH

24V

Frequency inverter

Use of the

"Safe pulse block"

Reset

Emergency stop button

Reset circuit

Shielded cable to eliminate

errors as per

DIN EN ISO 13849-2

Input circuit

with short-

circuit

detection

Supply

voltage

Safety output

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Nord-drivesystems BU0530 User Manual Page 23

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