Mitsubishi Electric EMU4-CNT-MB, Руководство пользователя

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11. Reference
This chapter describes how to deal with some troubleshooting and introduces Q & A.
11.1 Troubleshooting
If you observe abnormal sound, odor, smoke, or heat generation from this product, turn off its power supply to stop using it
promptly.
In addition, if you are considering repair of your product, check the following points before that.
A setting content and its actual control operation differ.
In order to identify the cause, check the following points.
If the cause is identified, remove it.
No. Item Confirmation contents
①
Wiring
By executing the operation of 7.11 Check of Connection , check whether
an error occurs in communication.
If any error is occurring, check the following point:
・
The terminal of the connection destination is powered up.
・
The wiring is correctly done.
・
There is no disconnecting.
②
Control setting
・
The setting is correctly done.
・
The control setting is written.
・
The clock of the control unit is set.
*For interlocking control, it is unnecessary.
③
Measurement
value
(Extension unit)
By executing the operation of 8 Measurement Value Monitoring , check
that correct measurement values are displayed.
If any error is occurring, check the following point:
・
The settings of any extension units are correctly done.
・
The wiring is correctly done.
・
There is no disconnecting.
④
Error
・
Check whether any error occurs from the LED indicator of the control
unit.
Refer to
4.1.2 LED Indicator and Function .
・
Output the event logs and check whether any error occurs.
Refer to
10.1 Output of Event Log .
The baud rate of MODBUS RTU communication cannot be changed.
①
After the setting is changed from the small type display unit (Model: EMU4-D65), switching the power supply
from OFF to ON returns to the previous setting.
②
Even though the setting is changed from Control Unit Engineering Tool, it is not reflected.
●Cause
①
No change can be made to the baud rate of MODBUS RTU communication from the small type display unit.
Therefore, switching the power of the control unit from OFF to ON returns to the previous setting.
*Although the setting after change is displayed, the control unit is operating with the setting before change.
●Resolution
②
Switch the power of the control unit from OFF to ON or reset it with the reset button.
●Cause
②
After the setting change, the display is not reflected until the control unit is powered ON from OFF or reset with
the reset button.
*Although the setting after change is displayed, the control unit is operating with the setting before change.
Analog output (voltage output) cannot be manually controlled.
●Resolution
After the control unit starts the analog output since the control setting is written, execute the manual control.
●Cause
For analog output (voltage output), when the manual control is executed before the control unit starts the analog
output since the setting is written, an analog output (current output) is changed.