Pilz PSS SB FT, Basic license - Manual (Page 87)

Modular Block System: Burner Management 6-43
• SB152: BR_START for error reaction
• SB153: FLAP
• SB255: To call up the operating system
Programming guidelines
• ENBL
The ENBL of SB153 must be supplied to the AND-operation before the
global input ERR or to the AND-operation before the global input CHAI of
SB152 “Burner: Start and operator elements”. The decision to use ERR
or CHAI depends on the user and the respective standards regarding
error reaction.
ERR: If an error is present, a controlled shutdown occurs when
AuSt = 1 with restart
CHAI: If an error is present a safety shutdown occurs
A programming example can be found in Chapter 8 under “Managing
enables.
• Driving the air dampers
During burner start-up the air dampers must be driven by SB153. After a
control enable, position monitoring is no longer required and the air
damper motors can be drive directly without SB153.
A programming example can be found in the section “driving the Air
Dampers” in Chapter 8.
• DirO and DirC
Driving one flap: the drive must be driven in one direction only i.e. DirO
and DirC must not be driven simultaneously.