Trane Tracer MP501 User Manual

48 CNT-SVX08F-EN
Binary Output 3 (Relay Output) Troubleshooting
If binary output 3 (relay output) is not turning on the equipment wired to it, then follow the
troubleshooting steps in Table 18. Perform the steps in the order they are listed.
The troubleshooting steps assume the equipment connected to binary output 3 is off when the user
believes it sh
ould be on and vice versa.
Table 18. Binary output 3 (relay output) troubleshooting of external wiring
Step Number Action Probable Cause
Step 1
Perform the initial troubleshoot
ing steps described in Table 17, p. 47 and verify general board
operation is okay.
General board
problem.
Step 2
Inspect the wiring. Is there a good connection between the wire and the terminal blocks? Look
for sh
orts or opens. Pay particular attention to wire splices.
Wiring problem.
Step 3
Take your meter (set to measure ac voltage) and measure
the voltage across the binary output
3 terminals on the MP501.
If you see approximately 24 V, the problem lies beyond the MP501. Is the wiring to the
e
quipment good? Is there a pilot relay and is it functioning correctly? Is a Hand-Off-Auto (HOA)
switch overriding the equipment?
If you see approximately 0 V, proceed to the next step.
Wiring problem.
Step 4
Remove the wires from the binary output 3 terminals and measure the voltage ag
ain.
If you see 24 V, there is a wiring or equipment problem external to the MP501.
If you still see approximately 0 V, the MP501 is commanding the output to be off and you need
to investigate th
e MP501 further. Refer to Table 19, p. 48.
Wiring problem.
If binary output 3 (relay output) is still not turning on the equipment wired to it, then follow the
additional troubleshooting steps in Table 19. These steps will assist in the configuration and
operation of binary output 3.
Table 19. Binary output 3 (relay output) troubleshooting of configuration and operation
Step Number Action Probable Cause
Step 1
Connect the Rover service tool to the LonTalk communication link, start th
e Rover service tool,
and select the MP501 from the Active Group Tree. The device plug-in for the selected MP501
will appear with the Status screen displayed in the workspace.
Refer to the Rover Se
rvice Software Installation, Operation, and Programming Guide (EMTX-
SVX01).
—
Step 2
Look on the Unit tab. Is the MP501 in unoccupied
mode? If th
e mode is unoccupied the controller
will command binary output 3 to be off.
If the controller is unoccupied but you think it sho
uld be in a different state, refer to the section,
“Occupancy Arbitration (Only SCC Mode),” p. 52.
MP501 in unoccupied
mode.
Step 3
Is the MP501 configured as a Space Comfort Contr
oller (SCC) with the fan configured to
be
cycling? The Unit tab shows if the controller is operating as an SCC.
If so, select the Configuration button to display the Device Configuration screen. Select the Fan
tab to see whe
ther the fan is configured to be continuous or cycling. If configured for cycling,
the fan will be off unless the space temperature is calling for heating or cooling.
SCC mode: Fan cycled
off b
eca
use of
temperature.
Step 4
From the Device Configuration screen, select the Close button to display the Status screen in
the workspace
. Select the Unit tab and check diagnostics. In SCC mode, if you’re not using the
network space temperature input and the hardwired space temperature input fails, the relay
output goes off.
Similarly, in generic mode, if you’re not usin
g the network input and th
e hardwired input
(temperature, flow, pressure, percent, ppm) fails, the relay output goes off. The controller will
return to normal operation when the sensor is no longer failed.
Sensor failure
diag
nostic.
Ste
p 5
Check to see if either of the network variables nviRelayOverride or nviEmergOverride is keeping
binary
output 3 off. These variables can override the relay output.
To view nviRelayOverride and nviEmergOverride, refer to the Rover Se
rvice Software
Installation, Operation, and Programming Guide (EMTX-SVX01).
Binary output 3
overridde
n.
Analog Output (0–10 Vdc) Troubleshooting
If the MP501 analog output is not opening the end device, then follow the troubleshooting steps
in Table 21, p. 49. Perform the steps in the order they are listed.

Trane Tracer MP501 Specifications

General

Brand	Trane
Model	Tracer MP501
Category	Controller
Language	English