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6. PROTECTIVE FUNCTIONS
6.1 Inverter fault and alarm indications
6 PROTECTIVE FUNCTIONS
This chapter explains the PROTECTIVE FUNCTION that operates in this product.
Always read the instructions before using the equipment.
6.1 Inverter fault and alarm indications
• When the inverter detects a fault, depending on the nature of the fault, the operation panel displays an error message or
warning, or a protective function is activated to trip the inverter.
• When any fault occurs, take an appropriate corrective action, then reset the inverter, and resume the operation. Restarting
the operation without a reset may break or damage the inverter.
• When a protective function is activated, note the following points.
• Inverter fault or alarm indications are categorized as below.
• The past eight faults can be displayed on the operation panel. (Fault history) (For the operation, refer to the operation panel
or the parameter unit Instruction Manual.)
Item Description
Fault output signal Opening the magnetic contactor (MC) provided on the input side of the inverter at a fault occurrence
shuts off the control power to the inverter, therefore, the fault output will not be retained.
Fault or alarm indication When a protective function activates, the operation panel displays a fault indication.
Operation restart method While a protective function is activated, the inverter output is kept shutoff. Reset the inverter to restart
the operation.
Displayed item Description
Error message A message regarding an operational fault and setting fault by the operation panel and the parameter
unit. The inverter does not trip.
Warning The inverter does not trip even when a warning. However, failure to take appropriate measures will
lead to a fault.
Alarm The inverter does not trip. An Alarm (LF) signal can also be output with a parameter setting.
Fault A protective function is activated to trip the inverter and output a Fault (ALM) signal.
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