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
24 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 or
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 safety-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.
3.5.5
Carrying out the function test
You can start the different individual tests for the function test with the
"TEST/RESET/RESET MODE" button.
