Trane Tracer MP501, Installation, Operation And Maintenance Manual, Page: 47 / 60

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Troubleshooting
Troubleshooting
This section outlines some general troubleshooting steps that should be performed if there is a
problem with the operation of the equipment controlled by the MP501.
If encountering operational problems with the MP501, first, perform initial troubleshooting steps
described in the next section,
“Initial Troubleshooting” .
After performing the initial troubleshooting steps, refer to the following specific sections to further
diagnose the following operational problems:
•
If binary output 3 is not turning on the equipment wired to it, refer to the section, “Binary Output
3 (Relay Output) Troubleshooting,” p. 48 .
• If the analog output is not opening the end device, refer to the section, “Analog Output (0–10
Vdc) Troubleshooting,” p. 48 .
• If binary outputs 1 and 2 are always off, refer to the section, “Binary Output 1 and 2
Troubleshooting,” p. 51 .
Initial Troubleshooting
Always perform the initial troubleshooting steps listed in Table 17 before moving on to the specific
area of trouble. Perform the steps in the order they are listed.
Table 17. Initial troubleshooting steps
Step Number Action Probable Cause
Step 1
Look at the red Service LED. If it is flashing once per second, the controller is not executing
the application software because the network connections and addressing have been removed.
Refer to the section,
“Status Indicators for Operation and Communication,” p. 43 .
MP501 is not
configured.
Step 2
Look at the green Status LED. It should be on continuously during normal operation. A blinking
Status LED indicates the MP501 is performing a manual output test. Refer to the section,
“Status Indicators for Operation and Communication,” p. 43 .
MP501 is in manual
output test mode.
Step 3
Take your meter (set to measure ac voltage) and measure the voltage across the ac-power
terminals on the MP501 (with ac wires connected). If there is approximately 24 V (21–27 V)
on those terminals, the board is receiving adequate input power and you likely have a MP501
circuit board problem.
MP501 circuit board
problem.
Step 4
Disconnect the ac wires from the input power terminals. Take your meter (set to measure ac
voltage) and measure the voltage across the ac wires. If you see approximately 0 V, the board
is not receiving the power it needs to run.
Input power problem
Step 5
Reconnect the ac wires to the input power terminals. Perform the manual output test (refer to
the section,
“Manual Output Test,” p. 43 ).
If the outputs on the controller do not behave as described in Table 12, p. 44 , then there is a
problem with the MP501 circuit board.
MP501 circuit board
problem.