Trane LPC Install And Operation Instructions page 55

Input and Outputs
This chapter provides information about
the function of inputs and outputs of the
Tracer AH540/541 controller. The Tracer
AH540 is configured at the factory per
unit configuration and order information.
The field-installed Tracer AH541 must be
configured using a Rover service tool
(refer to the Rover Operation and
Programming guide, EMTX-SVX01E-EN,
for more information).
Binary outputs
The Tracer AH540/541 controller has six
binary outputs that are assigned to the
specific functions shown in Table O-GI-2.
The binary outputs are normally-open,
form A relays. The relays act as a switch
by either completing or breaking the
circuit between the load (the end device)
and the 24 Vac power. For example,
when binary input BO1 is energized, 24
Vac is supplied to terminal BO1, which in
turn energizes the supply fan start/stop
relay (see Figure O-GI-14).
Each binary output has a green status
LED on the Tracer AH540/541 controller
board. The LED is off when the relay
contacts are open. The LED is on when
the relay contacts are closed.
When the binary output relay is Off
(contact is open), a multimeter should
measure 0 Vac across the output termi-
nals. When the binary output relay is On
(contacts are closed), a multimeter should
measure 24 Vac across the output
terminals.
Analog outputs
The Tracer AH540/541 controller has five
analog outputs that are assigned to the
specific functions shown in Table O-GI-3
LPC-SVX01C-EN
Operation
Table O-GI-2. Binary outputs functions & locations
Tracer AH540 Tracer AH541
factory
output terminal terminal
label label label
BO1 TB21/1 OUT J21
TB21/2 GND
BO2 TB22/1 OUT J22
TB22/2 GND
BO3 TB23/1 OUT J23
TB23/2 GND
BO4 TB24/1 OUT J24
TB24/2 GND
BO5 TB25/1 OUT J25
TB25/2 GND
BO6 TB26/1 OUT J26
TB26/2 GND
2 4 V A C
GND
Figure O-GI-14. Tracer AH540 Termination Board Example
Table O-GI-3. Analog output functions & locations
Tracer AH540 Tracer AH541
factory
output terminal terminal
label label label
AO1 TB11/1 OUT J1 1
TB11/2 GND
AO2 TB12/1 OUT J12
TB12/2 GND
AO3 TB13/1 OUT J13
TB13/2 GND
AO4 TB14/1 OUT J14
TB14/2 GND
AO5 TB15/1 OUT J15
TB15/2 GND
AO6 TB16/1 J16
TB16/2
1 Each analog output can be configured for 0–10 Vdc or 2–10 Vdc operation, and normally open or normally closed.
general
information
field
terminal
label function
BO1 supply fan start/stop
BO2 exhaust fan start/stop
BO3 DX stage 1 or electric stage 4
BO4 DX stage 2 or electric stage 3
BO5 DX stage 3 or electric stage 2
BO4 DX stage 4 or electric stage 1
TB21-1
BO
TB21-2
field
terminal
label function
AO1 supply fan speed
AO2 cool valve output or
2-pipe changeover
AO3 heat output (water, steam,
or electric heat sequencer)
AO4 face & bypass damper
AO5 outdoor air damper
AO4 not used
maximum
power output
function rating
24 Vac 12 VA
ground
24 Vac 12 VA
ground
24 Vac 12 VA
ground
24 Vac 12 VA
ground
24 Vac 12 VA
ground
24 Vac 12 VA
ground
Supply Fan (Start/
maximum
output range output
default value 1 rating
0 to 10 Vdc 20 mA
ground
2 to 10 Vdc 20 mA
ground
2 to 10 Vdc 20 mA
ground
2 to 10 Vdc 20 mA
ground
2 to 10 Vdc 20 mA
ground
2 to 10 Vdc 20 mA
ground
55