12
Functional safety
Connections variants
Operating Instructions – MOVIMOT
®
flexible
355
12.4.2 Requirements
Using safety relays
The requirements of the manufacturers of safety relays (such as protecting the output
contacts against welding) or of other safety components must be strictly observed. For
cable routing, the basic requirements apply as described in this documentation.
For connecting the drive unit with the safety relays, observe the installation require-
ments in chapter "Functional safety" > "Safety conditions" > "Installation require-
ments".
All instructions by the manufacturer of the safety relay used in the particular applica-
tion must be observed.
Using safety controllers
The switch-off test pulse of the used safe digital outputs (F-DO) must be ≤1ms and
another switch-off test pulse must only occur 2ms later at the earliest.
15214338827
[1] High
[2] Low
INFORMATION
If the safety-related control voltage plug at the STO input is switched off (STO activa-
ted), you must observe chapter "Functional safety" > "Safety conditions" > "Require-
ments for the external safety controller" with regard to the test pulses.
INFORMATION
If F_STO_P1, F_STO_P2 are connected to DC24V, and F_STO_M is connected to
GND, STO is deactivated.
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.
29129451/EN – 12/2019
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