Metasys TC-9100 Series User Manual

18 Technical Bulletin—TC-9100 Universal Controller
The 3-speed fan controller output may be configured only in Output
Module OCN5, and it also uses OCN6 and OCN7.
The output is a set of three digital outputs (triacs) that are switched on in
turn at the three fan speed break points, set as configuration parameters.
The switching differential for all break points is also set as a
configuration parameter. The first output switches on at Break Point 1
and off at Break Point 1 less the switching differential. The second output
switches on at Break Point 2 and the first output is switched off. The third
output switches on at Break Point 3 and the second output is switched off.
Only one output is on at one time, and the switching differential is
applied to all on/off transitions.
The 3-speed fan controller output may be connected to any programmable
module except those configured as Algorithm 1, 3, or 5.
}
Differential
}
Differential
}
Differential
Speed 3
Speed 2
Speed 1
Off
0
100
Module
Output
Process Variable
Break Point 1
Break Point 2
Break Point 3
Figure 6: 3-Speed Fan Output
When OCN5 is configured as a 3-speed fan controller, the source control
signal connection to OCN6 defines an analog input that overrides the
controller, as follows:
• Analog input value to OCN6 less than 0 ⇒ Automatic mode
(3-speed fan module controlled by source defined in OCN5).
• Analog input value to OCN6 between 0 and 100 ⇒ Override mode
(3-speed fan module controlled by analog input value to OCN6).
The output triacs switch at the defined break points and use the defined
switching differential in both Automatic and Manual modes. The
Override feature enables the manual control of fan speed using an analog
input connected, for example, to a switch assembly that generates the
voltage levels to force the appropriate fan speed or allow automatic
operation.
Alternatively, the TM-9180 can be used to override the 3-speed fan
controller. Refer to Configuration for a TM-9180 Room Command
Module, further in this manual, for configuration details.
3-Speed Fan
Controller
Output
3-Speed Fan
Override

Metasys TC-9100 Series Specifications

General

Brand	Metasys
Model	TC-9100 Series
Category	Controller
Language	English