BCU 460, BCU 465 · Edition 11.19 111
Parameters
Fault
In the event of a fault, there will be no signal at ter-
minals 65 and66 so that the actuator moves to the
closed position. When approaching the closed posi-
tion, no timeout of 250s is active since no feedback
input is checked. This may result in a situation where
the program is continued in the case of a request for
the closed position, without the butterfly valve being
closed. The outputs at terminals64 (controller enable)
and67 (closed position) on the BCU are non-functional
and are not activated.
Manual mode
In Manual mode, no external controller is enabled. The
actuator can be moved to the positions for maximum
capacity or ignition capacity by the user. 3-point step
operation is not possible. No timeout is active when ap-
proaching these positions.
Parameter I020 = 5: air valve.
The positions for maximum capacity and ignition ca-
pacity can be set using the air valve. If the air valve is
closed, the ignition capacity is reached, if it is open, the
maximum capacity is reached.
BCU 460/LM..F3
µC
VAS VAG
VR..L
V1
V2
61
60
22
65
UVS
Parameter A042 (Running time) can be used to adjust
the behaviour in the case of slow opening and closing
air valves so that the system can be set to ignition posi-
tion before a start-up is initiated, see page91 (Run-
ning time). Parameter A041 (Running time selection)
must be set to 1 to adjust this behaviour.
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