Description
3.5 Functions
SIRIUS 3RM1 motor starter
Manual, 06/2016, A5E0345285095020A/RS-AE/005
45
If it can be ensured that the cables are installed in such way that they are protected against a
cross-circuit and short-circuit to a power cable, safety-related shutdown of A1 (I+) via a
safety-related output of the control will suffice. If this cannot be ensured, or if a PM-switching
output is used, both A1 (L+) and A2 (M) must be shut down via a safety-related output. In
both cases, safety-related shutdown in compliance with SILCL 3 per EN 62061, PL e / Cat. 4
per EN ISO 13849-1 is achieved.
Note
Motor starters with 24 V DC control supply voltage
As is usual on
solid-state motor starters, a buffering capacitance of 250 µF is installed in the
V DC control circuit of the 3RM1 Standard and Failsafe motor starters. Its purpose is to
specifically shut down the motor with the semiconductors in the event of failure o
r
disconnection of the control supply voltage. As a result, charging currents can arise briefly
upon activation of the control supply voltage. The buffering capacitance is decoupled by a
diode. This means that there is no influence on the dark test of safe
ty-related outputs.
You can find more information on the Internet
(
https://support.industry.siemens.com/cs/ww/en/view/91372998).
Safety-related shutdown via inputs IN1 and IN2
As an alternative in the case of 3RM11 / 3RM13 Failsafe motor starters with a 24 V DC
supply voltage, safety-related shutdown via the IN1 and IN2 inputs is possible. The safety-
related output of the fail-safe control / evaluation unit performs operational switching.
Depending on peripherals used, shutdown is in one or two channels:
● PM (PPM)-switching: shutdown is in two channels.
● PP-switching: shutdown is in one channel.
Single-channel switching achieves SILCL 3 per EN 62061, PL e/Cat. 4 per EN ISO
13849-1 if steps are taken to ensure that the cables are installed in such a way that they
are protected against a cross-circuit/line-to-line fault.
Carrying out the function test
You can start the different individual tests for the function test with the
"TEST/RESET/RESET MODE" button.
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