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Protective and Diagnostic Functions
This section describes the alarm functions of the Inverter. The alarm functions include fault detection,
alarm detection, operation error detection, and autotuning error detection.
When an alarm is detected in the Inverter, the LED “ALARM” indicator on the Digital Operator on the
panel lights (fault detection) or flashes (alarm detection), and the fault detail is displayed on the monitor.
Even after the fault is reset, the former fault log can be verified by calling up the menu.
Fault Detection and Alarm Detection
When the Inverter detects a fault, the fault contact output operates, and the Inverter output is shut off causing
the motor to coast to a stop. (The stopping method can be selected for some faults, and the selected stopping
method will be used with these faults.) A fault code is displayed on the Digital Operator.
When a fault has occurred, refer to the following table to identify and correct the cause of the fault.
Use one of the following methods to reset the fault before restarting the Inverter:
•
Set a multi-function contact input (H1-03 to H1-16) to 14 (Fault Reset) and turn on the fault reset signal.
•
Press the RESET Key on the Digital Operator.
•
Turn the main circuit power supply off and then on again.
Alarms are detected as a type of Inverter protection function that do not operate the fault contact output. The
system will automatically returned to its original status once the cause of the alarm has been removed.
The Digital Operator display blinks and an alarm is sent from the multi-function outputs.
Fault detection (F) and alarm detection (A) are classified into “Drive Faults” and “Cell Faults”.
WARNING
• Before opening the cover of the Transformer Panel or Power Cell Panel, ensure that the power
supply has been turned off.
• Before touching the interior of the Power Cell Panel, open the cover at least ten minutes after the
medium-voltage power supply is turned off, and confirm that LED indicator "CHARGE" on the cell
front face has been completely turned off.
Failure to observe this warning may result in an electric shock.
