LPC-SVX01C-EN 55
Operation
general
information
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
Table O-GI-2. Binary outputs functions & locations
Tracer AH540 Tracer AH541
factory field maximum
output terminal terminal terminal power output
label label label label function function rating
BO1 TB21/1 OUT J21 BO1 supply fan start/stop 24 Vac 12 VA
TB21/2 GND ground
BO2 TB22/1 OUT J22 BO2 exhaust fan start/stop 24 Vac 12 VA
TB22/2 GND ground
BO3 TB23/1 OUT J23 BO3 DX stage 1 or electric stage 4 24 Vac 12 VA
TB23/2 GND ground
BO4 TB24/1 OUT J24 BO4 DX stage 2 or electric stage 3 24 Vac 12 VA
TB24/2 GND ground
BO5 TB25/1 OUT J25 BO5 DX stage 3 or electric stage 2 24 Vac 12 VA
TB25/2 GND ground
BO6 TB26/1 OUT J26 BO4 DX stage 4 or electric stage 1 24 Vac 12 VA
TB26/2 GND ground
Figure O-GI-14. Tracer AH540 Termination Board Example
TB21-1
TB21-2
24VAC
GND
Supply Fan (Start/
BO
Table O-GI-3. Analog output functions & locations
Tracer AH540 Tracer AH541
factory field maximum
output terminal terminal terminal output range output
label label label label function default value
1
rating
AO1 TB11/1 OUT J11 AO1 supply fan speed 0 to 10 Vdc 20 mA
TB11/2 GND ground
AO2 TB12/1 OUT J12 AO2 cool valve output or 2 to 10 Vdc 20 mA
TB12/2 GND 2-pipe changeover ground
AO3 TB13/1 OUT J13 AO3 heat output (water, steam, 2 to 10 Vdc 20 mA
TB13/2 GND or electric heat sequencer) ground
AO4 TB14/1 OUT J14 AO4 face & bypass damper 2 to 10 Vdc 20 mA
TB14/2 GND ground
AO5 TB15/1 OUT J15 AO5 outdoor air damper 2 to 10 Vdc 20 mA
TB15/2 GND ground
AO6 TB16/1 J16 AO4 not used 2 to 10 Vdc 20 mA
TB16/2 ground
1 Each analog output can be configured for 0–10 Vdc or 2–10 Vdc operation, and normally open or normally closed.
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