SEWControl Cabinet Inverter MOVITRAC® B Functional Safety

cable routing.

For reasons of EMC, the length of the cable between connection X17 (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 safety relay used in the specific

application must also be observed.

Determining the maximum number of MOVITRAC® B drives for disconnection of group drives

The number (n units) of MOVITRAC® B units that can be connected to a group drive with

safe disconnection is limited by the following points:

1. Switching capacity of the safety relay.

A fuse must be connected in front of the safety contacts according to the

specifications of the safety relay manufacturer to prevent the contacts from sticking

or welding.

The project planner is responsible for ensuring that the specifications on the

switching capacity according to EN 60947-4-1, 02/1 and EN 60947-5-1, 11/97 as well

as on contact fuse protection given in the operating instructions of the safety relay

manufacturer are strictly observed.

2. Maximum permitted voltage drop in the 24 V power supply cable.

Values concerning cable lengths and permitted voltage drops must be observed

during project planning for group drives.

3. Maximum cable cross section of 1x1.5 mm2 or 2x0.75 mm2.

A calculation based on the technical data of MOVITRAC® B must be performed

separately for each group drive application