12
Functional safety
Connections variants
Operating Instructions – MOVIMOT
®
advanced
292
Using safety controllers
The switch-off test pulse of the used safe digital outputs (F-DO) must be ≤ 1 ms and
another switch-off test pulse must only occur 2 ms later at the earliest.
<1 ms
>2 ms
t
[1]
[2]
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 DC 24 V, 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 max. 100 m. Any 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 device. 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 requirements for cable
routing also apply.
•
A calculation based on the technical data of the device must be performed separ-
ately for each case of STO group disconnection.
•
A maximum of 20 drive units may be used in one STO group disconnection.
25891936/EN – 05/2020