Honeywell Krom Schroder BCU 580 - Page 79

BCU 580 · Edition 11.15l 79
Parameters
Operating mode 11
Operating mode 11 allows cyclic operation (ON/OFF
and OFF/Low/High/OFF).
The actuator IC moves to the “High fire” position during
the controller enable procedure. There is no timeout ac-
tive in this case.
t [s]
t [s]
t
1
t
2
t
3
t
4
t
5
t
6
DI 1
DI 2
Purge
Closed
Ignition
High
fire
BCU IC 40 (operating mode 11)
Signal at
terminal
Position Butterfly valve position
55 53
OFF OFF Closed Closed
ON OFF Ignition
Minimum/Ignition capacity
ON ON High-fire rate High-fire rate
OFF ON Purge Maximum capacity
Operating mode 27
During the controller enable procedure, the actuator
IC 40 can be adjusted infinitely between the positions
for maximum and minimum capacity using its ana-
logue input (terminals 18 and 19). There is no timeout
active in this case.
t [s]
t [s]
t
1
t
2
t
3
t
4
t
5
t
6
0–20
mA
DI 1
DI 2
Purge
Closed
Ignition
BCU IC 40 (operating mode 27)
Signal at
terminal
Position Butterfly valve position
55 53
OFF OFF Closed Closed
ON OFF Ignition
Minimum/Ignition capacity
ON ON 0–20 mA
Any position between minimum and
maximum capacity
OFF ON Purge Maximum capacity
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