Siemens SIRIUS 3RK3 - Guidelines for Capacitive Loads; Guidelines for Inductive Loads

6.2.2.2 Guidelines for capacitive loads
The following 󹪝gure shows the maximum capacitive load C [μF] at load current I [mA] at the
safety-related outputs for di󹪜erent MSS 3RK3 modules.
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① 3RK3 central units
2/4F‑DI 2F‑DO expansion module
② 4F‑DO E01 expansion module
③ 4F‑DO expansion module as of E02
6.2.2.3 Guidelines for inductive loads
NOTICE
High inductive switching currents
The outputs of the safety relay do not feature internal induction protection. If inductive loads
are operated at the binary outputs of the safety relay, they must be provided with inductive
interference protection.
Inductive loads must be provided with protective circuits that limit the voltage rise when the
controller output is switched o󹪜. Protective circuits protect the outputs against premature failure
due to high inductive switched currents. They also limit the electrical faults that can occur when
inductive loads are connected.
Note
The e󹪜ectiveness of a protective circuit depends on the respective application and must always
be checked on a case-by-case basis. The components in a protective circuit must always be rated
in line with the relevant application.
Operation
6.2 Selection of sensors and actuators
SIRIUS 3RK3 Modular Safety System
190 Equipment Manual, 07/2020, NEB926253002000/RS-AC/006