Description
3.5 Functions
SIRIUS 3RM1 motor starter
34
Manual, 11/2013, A5E0345285095020A/RS-AB/002
Short-circuit protection
Short-circuit protection must be handled by separately arranged overcurrent protection
devices.
On this topic, refer to the Chapter "Load feeders - protection against short circuit (Page 58)".
Cable protection
Avoid impermissibly high cable surface temperatures by correctly dimensioning the cross
sections. Select an adequate cable cross-section.
Cyclic test of the protection functions
The tests are run by means of the "TEST/RESET/RESET MODE" button and can take place
when the motor is either on or off. The test consists of three function tests.
Carry out the tests during commissioning and cyclically every 36 months at the latest.
You will find out how to run the test in Chapter "Carrying out the function test (Page 39)".
Ambient conditions
See the chapter "Ambient conditions (Page 56)".
ATEX-specific safety data
The motor protection function according to ATEX in the case of 3RM11/3RM13 motor
starters has the following safety data:
Safety integrity level (SILCL)
2
Hardware fault tolerance (HFT)
0
Interval for testing the protective functions
3 years
Probability of failure on demand (PFD)
5x10
-4
Probability of a dangerous failure per hour (PFH)
5x10
-8
1/h
Note
See the data sheet for other specifications. You will find the data sheet in Service&Support
(
http://www.siemens.com/industrial-controls/support
).
