Mitsubishi Electric NZ2MFB1-32D, User Manual

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11 TROUBLESHOOTING
11.4 Examples of Troubles with the I/O Module
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11
11.4
Examples of Troubles with the I/O Module
Troubleshooting for input circuit
An input signal does not turn off No.1
■ Cause
There is a leakage current from the input switch (driven by a contactless switch and others).
■ Action
Connect an appropriate resistor so that the voltage between terminals of the input module would fall below the OFF voltage.
The recommended CR constant is as follows: 0.1 to 0.47

F + 47 to 120

(1/2W).
An input signal does not turn off No.2
■
Cause
There is a leakage current from the input switch (driven by a limit switch with neon lamp).
■
Action
Take either of the following actions:
• Connect an appropriate resistor so that the voltage between terminals of the input module would fall below the OFF
voltage. (Same as the action taken when an input signal does not turn off No.1)
• Make the circuit independent and provide another display circuit.
C
Power supply
AC input
Input module
Leakage
current
R
C
AC input
Input module
Power supply
Power supply
AC input
Input module
Leakage
current