24 CNT-SVX09E-EN
Troubleshooting Binary Output (Relay Output)
If a binary output (relay output) is not turning on the equipment wired to it, then follow the
troubleshooting steps in Table 14. Perform the steps in the order they are listed.
The troubleshooting steps assume the equipment connected to the binary output is OFF when it
is beli
eved to be ON and vice versa when it should be OFF.
Table 14. Binary output (relay output) troubleshooting of external wiring
Step Number Action Probable Cause
Step 1
Perform the initial troubleshooting step
s described in Table 13, p. 23 and verify that general
board operation is functioning.
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
Look at the status LED for the binary output you are troubleshooting. If the LED is ON, the
MP5
03 is energizing its output relay.
Use volt meter (set to measure ac voltage) to measu
re the voltage across the binary output
terminals on the MP503.
If the voltage is approximately 24 V, the problem lies beyond the MP503. Is the wiring to the
equipment
good? Is there a pilot relay and is it functioning correctly? Is a Hand-Off-Auto (HOA)
switch overriding the equipment?
If the voltage is approximately 0 V, proceed to the next step.
Wiring problem.
Step 4
Remove the wires from the binary output terminals an
d measure the voltage ag
ain.
If the voltage is 24 V, there is a wiring or equipment prob
lem external to the MP503.
If the voltage is still approximately 0 V, the MP503 is commanding the output to be OFF and
further investigation is re
quired. Refer to Table 15 to troubleshoot the configuration and
operation of
the binary output.
Wiring problem.
Table 15. Binary output (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 MP503 from the Active Group Tree. The device plug-in for the selected MP503
appears with the Status screen displayed in the workspace.
For more details, refer to the Rove
r Operation an
d Programming Guide (EMTX-SVX01).
—
Step 2
Select the Bindings button to view the Network Variable Bind
ings Summary screen for the
LonTalk network that includes this MP503. (The Bindings button will be disabled if the MP503
is the
only device currently on the network.) Is this binary output bound? Is it bound to more
than one network device? If it is bound to two devices, one may be commanding the binary
output on while the other commands it off.
For more information about network bindings, refer to the section, “Network Variable Bindings,”
p. 13.
Bindings problem.
Step 3
If the binary output is correctly bound to another d
evice
, is that device communicating? If it
has not communicated for at least 15 minutes, the binary output will go to its communication
loss position. The communication loss position is configurable using the device plug-in. Proceed
to the next step to view or edit the communication loss position of the binary output.
Network
communication
s
problem.
Step 4
To view the communication loss position of the binary output, select the Cl
ose button to re
turn
to the Status screen. Press the Configuration button, then select the Outputs tab.
The communication loss position for a binary output can be set to On, Off, or Last State
. For
example, if you expect the equipment controlled by the binary equipment to be on but it is off
because of the communication loss position, you may want to change the communication loss
position from Off or Last State to On.
Incorrect
co
mmunication
loss
position.
To Next Page
Loading...
