ABB FSE-31 User Manual page 16

16 Hardware description
Risk assessment of the application must determine at least the
following safety critical requirements:
•
The need for a safety encoder. ABB recommends to use a
safety encoder if it is necessary to measure the safe speed
close to the zero speed region and in active load applications.
•
the required SIL or PL level
•
identifying the safety relevant application-specific parameters,
eg, process safety time
•
the required encoder resolution
The operation environment of the FSE-31 module must comply
with the specified conditions. See FSO-21 safety functions module
user's manual (3AXD50000015614 [English]).
If the FSE-31 module fails to operate, replace it with a new one. Do
not try to repair the module.
For instructions on decommissioning the module, see FSO-21
safety functions module user's manual (3AXD50000015614
[English]).
WARNING! Do not bypass the FSE-31 pulse encoder
interface module or FSO safety functions module under
any circumstances.