Chapter 20 Troubleshooting By Symptom - Mitsubishi Electric NZ2GN2S-D41P01 User Manual

20
TROUBLESHOOTING BY SYMPTOM
Troubleshooting by symptom is suitable for the case where the FPGA module fails to operate normally even though no error
has occurred in the FPGA module. If an error occurs in the FPGA module, identify the cause of the error using the engineering
tool.
When the input from an external device becomes abnormal
When the input from an external device becomes abnormal, check the following items.
Check item
Is the external wiring correct?
Is a shielded twisted pair cable used for wiring of pulse
input?
Are noise countermeasures taken for adjacent devices
in the control panel?
Is the distance between the high voltage equipment
and the pulse input line sufficient?
Is noise entering from the grounded part?
Are the power line and input cables not bundled?
Is there any wiring to unused terminals?
Are the digital filter settings for the digital input control
part and digital input/output control part appropriate?
Are the oversampling settings of the analog input
control part appropriate?
Are there any problems with the standard circuit
settings?
Is there a circuit that changes the input state in the
user circuit?
If the problem does not improve after checking all of the above and performing input using the sample circuit,
the possible cause is a module failure. Please consult your local Mitsubishi representative.
When the output to an external device becomes abnormal
When the output to an external device becomes abnormal, check the following items.
Check item
Is a shielded twisted pair cable used for wiring of pulse
output?
Are noise countermeasures taken for adjacent devices
in the control panel?
Is the distance between the high voltage equipment
and the pulse output line sufficient?
Is noise entering from the grounded part?
Are the power line and output cables not bundled?
Are there any problems with the standard circuit
settings?
Is the differential output pulse obtained when FPGA
control is stopped?
Is there a circuit that changes the output state in the
user circuit?
If the problem does not improve after checking all of the above and performing output using the sample circuit,
the possible cause is a module failure. Please consult your local Mitsubishi representative.
20 TROUBLESHOOTING BY SYMPTOM
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Action
Check if the wiring is correct. ( Page 54 INSTALLATION AND WIRING)
If a differential terminal is not wired, the input/output status display LED is on.
Use a shielded twisted pair cable for wiring of pulse input.
Take measures against noise, such as attaching a CR surge suppressor to a magnet switch.
The pulse input line should be a separate pipe, and the wiring inside the panel should be separated
from the power line by 150mm or more as a guideline.
Disconnect the ground cable of the FPGA module.
Avoid bundling the cables with the power line.
Do not wire to unused terminals.
Adjust the filter time of the digital filter. ( Page 202 Digital input/output control part (dio2_top))
Adjust the oversampling settings. ( Page 205 Analog input control part (ai2_top))
Check if the settings match the input specifications. ( Page 188 Standard Circuit)
Check the design of the user circuit.
Action
Use a shield twisted pair cable for wiring of pulse output.
Take measures against noise, such as attaching a CR surge suppressor to a magnet switch.
The pulse output line should be a separate pipe, and the wiring inside the panel should be separated
from the power line by 150mm or more as a guideline.
Disconnect the ground cable of the FPGA module.
Avoid bundling the cables with the power line.
Check if the settings match the output specifications. ( Page 188 Standard Circuit)
A pulse may be output when FPGA control is stopped, so please ignore it.
Check the design of the user circuit.