CNT-SVX08F-EN 47
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 MP5
01, 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
di
agnose the following operational problems:
• If binary output 3 is not turning on the equipme
nt wired to it, refer to the section, “Binary Output
3 (Relay Output) Troubleshooting,” p. 48.
• If the analog output is no
t open
ing 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 s
oftware because the network connections and addressing have been removed.
Refer to the section, “Status Indicators for Operation and Communication,” p. 43.
MP501 is not
co
nfigured
.
Step 2
Look at the green Status LED. It should be on continuously d
uring 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 ac
ross the ac-power
terminals on the MP501 (with ac wires connected). If there is approximately 24 V (21–27 V)
on those te
rminals, the board is receiving adequate input power and you likely have a MP501
circuit board problem.
MP501 circuit board
pr
oblem.
Step 4
Disconnect the ac wires from the input power terminals. Take your meter (set to measure ac
voltage) and measure th
e voltage across the ac wires. If you see approximately 0 V, the board
is not receiving the power it ne
eds to run.
Input power problem
Step 5
Reconnect the ac wires to the input power terminals. Perf
orm 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 ci
rcuit board.
MP501 circuit board
problem.
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