Chapter 3 BCU I/O Module
42 BMTW-SVN01F-EN
Figure 14 shows the typical wiring diagram to a Trane temperature sen-
sor with cancel and timed override buttons. There are two properties that
will show whether the cancel or timed override buttons have been
selected (turned on for 2 minutes). Note the polarity of the connections to
the sensor.
Figure 14. Temperature Sensor Wiring Diagram
For all UIPs in the BCU I/O module, you must create and set up the nec-
essary objects that will provide units, calculation, and alarming to the
desired input. Refer to the Tracer Summit System Programming guide for
creating and setting up the necessary objects.
Current and Voltage Configured UIPs
UIPs can be set up for either current or voltage input for transmitting
and sensor devices that are either current or voltage sources. For current
sources, the input can handle a range from 0–20 mA. The current source
must be able to drive 200 Ω. For voltage sources, the input can handle a
range from 0–10 Vdc. The voltage source must be able to drive 9000 Ω.
The BCU I/O module provides a 24 Vdc (100 mA) power supply output for
transmitting devices that require an external dc-power supply. Refer to
Figure 15 on page 43 for a wiring diagram on how to connect the power
supply to a transmitting device and an input.
Note:
The 24 Vdc power supply shares a common negative input with
the UIPs. This eliminates the need to connect a 24 Vdc negative
power output to the negative input of the UIP.
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