Bcu - Honeywell Krom Schroder BCU 580 Technical Information

Air control
4 .1 .2 BCU . .F3
V1
Process control (PCC)
FCU 500
ϑ1 A
1 2
17 18 37 38
BCU 580..C0F3
46
42
µC
43
HT
49
P
50
10
The BCU..F3 activates an air valve for purging, cooling
or starting the burner. The required air capacity is re-
leased by the air valve.
As soon as there is a purge signal at terminal 50 of
BCU..F3, the air valve is activated by the output at ter-
minal 10. The protective system (FCU 500) starts the
pre-purge time if there is adequate air flow. After the
elapse of the pre-purge time, the air valve closes for ig-
nition. Once the protective system (terminal 46, safety
BCU 580 · Edition 11.15l
V2
VAS VAG
VAS 1
V4
PLC
ϑ2
3
4
41
1
2
13
14
57
9
5
VR..L
interlocks) has issued the enable signal, the burner can
be started by the start-up signal at terminal 1. The gas
st
valves for the 1
ignited (on the BCU..C1 after a successful valve check).
After the operating signal has been received from the
burner, the gas valve for the 2
Staged control
P48 = 0, 1 or 2
Depending on parameters 48 and 49, the control
element may be activated either by the program or
TZI/TGI
externally via the input at terminal 2, see also from
page 86 (Air actuator control).
stage are opened and the burner is
nd stage opens.
28