Baumuller BM4400 - Function Principle STO

Safe stop
Instruction handbook b maXX BM4400, BM4600, BM4700
Document No.: 5.12008.07
333
of 358
E
C.2.2 Function principle STO
1) Applications that require a minimizing risk according to performance level d (EN ISO 13849-
1) or SIL 2 (EN
62061) according to chapter ZC.2.1 Safety classifications and safety notes–
from page 330 must have 2 independent shutdown paths, which are used to shut down the
commutation in the power section of the inverter.

For this risk minimization the two-channel shutdown via 1 safety relay with feedback on the
basic unit and the pulse enable circuit of the BM4000 controller LC3 are implemented.


The following Baumüller inverters BM4XXX-XXY-XXXXX[Ryy]-S01-XX in combination with
the Baumüller BM4000 controller LC3 of the accordant device model have these shutdown
paths:


BM4XXX-XXY-XXXXX[Ryy]-S01-XX with Y = 1, 3, 5:
device model with one safety relay and a discrete pulse enable circuit (size 1-7)
2) Applications for a minimizing risk according to performance level e (EN ISO 13849-1) or 
SIL 3 (EN62061) therefore need 2 independent shutdown paths, too.
The difference to 1) is that the two-channel shutdown must be implemented via two safety
relays in order to achieve a minimizing risk.


The Baumüller inverters of the b maXX of the device model 
BM4XXX-XXY-XXXXX[Ryy]-S01-XX in combination with the Baumüller BM4000 controller
LC3 of the accordant device model are provided with these shutdown paths:


BM4XXX-XXY-XXXXX[Ryy]-S01-XX with Y= 2, 4, 6: 
device model with two safety relays (size 3-7) 

These device models provide an additional functional shutdown via the pulse enable circuit
of the BM4000 controller LC3, besides the shutdown via both safety relays.

As the two-channel shutdown reaches performance level e and SIL3 using both safety relays,
the third shutdown path will not be responded to regarding the safety requirements.

The connection diagrams ZC.2.2.3 Connection diagrams– from page 338 and notes ZC.2.1
Safety classifications and safety notes– from page 330 must be complied with.