9
Functional safety
Connection variants
Operating Instructions – MOVIDRIVE
®
modular
264
9.4.3 STO signal for group disconnection
For group drives, the STO signal for several application inverters can be provided by a
single safety relay. The following requirements must be met:
• The cable length is limited to 30m. Other instructions published by the manufac-
turer 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 application inverter. 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 application inverter must be per-
formed separately for each case of group drive disconnection.
• A maximum of 20 axes of the application inverter must be used in a group discon-
nection.
24748536/EN – 11/2017
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