SEWControl Cabinet Inverter MOVITRAC® B Functional Safety

• The shielded lines of the safety-oriented 24 V voltage supply (terminal X17) must be

clamped under the signaling electronics shield clamp.

• You must observe the technical data of MOVITRAC® B (see MOVITRAC® B

operating instructions).

Removing jumpers

Requirements on external safety relays

• If the requirements of the standard EN 954-1 are to be met, at least one approval for

safety category 3 according to EN 954-1 must be available.

• If the requirements of the standard EN ISO 13849-1 are to be met, at least one

approval for performance level "d" according to EN ISO 13849-1 must be available.

• If the DC 24 V voltage supply is safely disconnected at the positive pole only, no test

pulses must be applied to this pole in disconnected condition.

• Bipolar disconnection of the DC 24 V supply is permitted.

• The values specified for the safety relays must be adhered to when designing the

circuit.

• The switching capacity of the safety relays must correspond at least to the maximum

permitted limited output current of the DC 24 V voltage supply. Observe the

manufacturer's instructions for the safety relays concerning the permitted

contact loads and fusing that may be required for the safety contacts. Unless

specified otherwise, the contacts must be protected with 0.6 times the nominal

value of the maximum contact rating specified by the manufacturer.

• The controller must be designed and connected in such a way that resetting the

control device itself will not lead to a restart. A restart may only be carried out after

an additional reset of the controller.

3.4.1 "Safety relay" sample circuit

The following figure shows the basic connection of an external safety relay (according

to the before mentioned requirements) to MOVITRAC® B.

The information in the respective manufacturer's data sheets must be observed for

connection. 

1-pole disconnection of the 24 V supply voltage:

3.5 Startup requirements

• Startup must be documented and the functionality of the safety functions must be

demonstrated.

• Startup checks of the disconnecting device and the correct wiring must be performed

and documented for MOVITRAC® B with safe disconnection of the drive according

to stop category 0 or 1 of EN 60204-1, fail-safe protection against restart according

to EN 1037 and compliance with safety category 3 according to EN 954-1 or

performance level "d" according to EN ISO 13849-1. 

• At startup, the safety-related 24 V control voltage must be included in the functional

test. 

3.6 Operation requirements

• Operation is only allowed within the limits specified in the data sheets. This applies

both to the external safety relay as well as MOVITRAC® B.

• The safety functions must be checked at regular intervals to ensure proper

functioning. The period of time between the tests should be specified in accordance

with the risk analysis.

Connection Variants

Refer to the publication "Safe Disconnection for MOVITRAC® B - Applications" for

examples of approved connection variants of units listed in the section "Approved Units"

for safe disconnection of the drive according to stop category 0 or 1 of EN 60204-1 and

fail-safe protection against restart according to EN 1037 and fulfillment of the safety

category according to EN 954-1 or performance level "d" of EN ISO 13849-1. The

publication "Safe Disconnection for MOVITRAC® B - Applications" is constantly being

supplemented by possible applications. The publication includes checklists, which offer

additional assistance in project planning and installation as well as operating

MOVITRAC® B drives in safety-oriented applications. It is essential that you comply with

the publications listed in the section "Safety and warning instructions" for all the

connection variants listed in the publication "Safe Disconnection for MOVITRAC® B -

Applications".

4.1 Disconnection of single drives

4.1.1 Requirements

The requirements of the manufacturers of safety relays (such as protecting the output

contacts against welding) or other safety components must be strictly observed. In

addition, the basic requirements described in the manual "Safe Disconnection for

MOVITRAC® B - Conditions" apply for cable routing.

For reasons of EMC, the length of the cable between connection X17 on

MOVITRAC® B and the safety components (e.g. safety relay) is limited to a maximum

of 100 m. Other instructions by the manufacturer on the use of safety relays for specific

applications must also be observed.

4.1.2 Internal 24 V supply, stop category 0

4.2 Disconnection of group drives

4.2.1 Requirements

For group drives, the 24 V supply of several MOVITRAC® B units can be made available

by a single safety relay. The maximum possible number of units (n units) results from

the maximum permitted contact load of the safety relay and the maximum permitted

voltage drop of the DC supply for MOVITRAC® B units.

Other requirements of the safety relay manufacturer (such as protecting the output

contacts against welding) must be strictly observed. In addition, the basic requirements

described in the manual "Safe Disconnection for MOVITRAC® B - Conditions" apply for