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10 Appendix
10.21 Feedback at Three-Point-Step Channels
10.21.1 Connect with Positive Locking
Since the ETAMATIC OEM, in the case of three-point step channels, adjusts the damper until
the actual value is equal to the setpoint value, the feedback potentiometer must always relia-
bly correspond to the damper position.
The damper motor potentiometer connections must be positive interlock connections, i.e. not
able to rotate.
In addition you must use potentiometers with high quality standards (see next page). If one of
these two points is not given, you must use two independent potentiometers (not dual-operat-
ed potentiometers) per channel for the feedback.
The motor damper connection must always be a positive interlock.
WARNING!
The connection has to be designed in that way that the maximum torque of the motor could
not break the connection under any condition.
Fig. 10-36 Example of positive potentiometer connection
10.21.2 Fail-Safe Feedback
In the case of single-channel feedback of TPS outputs, only authorised potentiometers may
be used. These must be switched directly.
2 Fuel selection
3 Safety interlock chain oil
4 Safety interlock chain gas
5 L 230VAC, 2A delay fuse, on site
6 Open
7 Close
8 Control drive oil
9 Control drive gas
No. Description
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