SEW-Eurodrive MOVIGEAR MGFx-DSI Series, Operating Instructions Manual

Page: 374 / 408

12
Functional safety
Connections variants
Operating Instructions – MOVIGEAR
®
performance
374
Switching off the STO signal for several drive units (STO group disconnection)
The STO signal for several drive units can be provided by a single safety relay. The
following requirements must be met:
• The total cable length is limited to 100 m. Other instructions published by the
manufacturer on the use of the safety device (for the respective application) must
also be observed.
• The maximum output current and the maximally permitted contact load of the
safety device must be observed.
• You must comply with the permitted signal levels at the STO input and all other
technical data of the electronics cover. The routing of the STO control cables and
the voltage drop must be considered.
• Other requirements of the safety manufacturer (such as protecting the output con-
tacts against welding) must be strictly observed. The basic cable routing require-
ments apply.
• A calculation based on the technical data of the electronics cover must be per-
formed separately for each case of STO group disconnection.
• A maximum of 20 drive units must be used in an STO group disconnection.
25887548/EN – 04/2019