FCU 500, FCU 505 · Edition 02.17 95
Parameters
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
FCU IC 40
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 Open Maximum capacity
In the event of a fault, there will be no signal at ter-
minals 53 and 55 so that the actuator moves to the
closed position. When approaching the closed posi-
tion, no timeout of 255 s 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 terminals 56 (controller enable)
and 54 (closed position) on the FCU 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.
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