Honeywell BCU 460 - Page 110

BCU 460, BCU 465 · Edition 11.19 110
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
65 66
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
65 66
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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