Safety Time During Operation T Sb; Flame Signal; Fault Lock-Out; Safety Interlocks (Limits) - Honeywell Krom Schroeder BCU 480 Manual

Glossary
11 .5 Safety time during operation t
08 08
t
SB
If the flame fails during operation, the valve outputs are
disconnected within the safety time t
The default safety time during operation t
ance with EN 298 is 1 second. In accordance with
EN 746-2, the safety time of the installation during
operation (including closing time of the valves) may not
exceed 3 s.
Note the requirements of the Standards!

11 .6 Flame signal

If a flame is detected, the flame detector will supply a
flame signal.

11 . 7 Fault lock-out

In the event of a fault lock-out, all valves and the igni-
tion transformer are disconnected from the electrical
power supply, and a fault is signalled. Resetting must
take place manually following a fault lock-out.
BCU 480 · Edition 03.16l

11 .8 Safety interlocks (Limits)

SB
The limiters in the safety interlock (linking of all the rel-
evant safety control and switching equipment for the
88
1
use of the application, e.g. safety temperature limiter,
5
4
minimum/maximum gas pressure) must isolate input
1
7
12
V1
9 1
16-17
1
21

11 .9 Pilot gas valve V1

2
14
V2
24
2
The start fuel flow rate for the pilot burner is released
28-29
2
18-19
by pilot gas valve V1. It opens when the safety time on
t
start-up t
burner is switched off again by a controlled shut-down
or fault lock-out.
.
SB
in accord-
SB
from the voltage supply.
starts to elapse. It remains open until the
SA1
80