Mitsubishi FR-A721-11K Instruction Manual page 164

Operation Panel
E.SER
Indication
Name
Communication fault (inverter)
This function stops the inverter output when communication error occurs consecutively for more than
permissible retry count when a value other than "9999" is set in Pr. 335 RS-485 communication retry count
Description
during RS-485 communication from the RS-485 terminals. This function also stops the inverter output if
communication is broken for the period of time set in Pr. 336 RS-485 communication check time interval.
Check point
Check the RS-485 terminal wiring.
Corrective action
Perform wiring of the RS-485 terminals properly.
Operation Panel
E.AIE
Indication
Name
Analog input fault
Stops the inverter output when a 30mA or higher current or a 7.5V or higher voltage is input to terminal
Description
2 while the current input is selected by Pr.73 Analog input selection, or to terminal 4 while the current
input is selected by Pr.267 Terminal 4 input selection.
Check the setting of Pr. 73 Analog input selection, Pr. 267 Terminal 4 input selection and voltage/current
Check point
input switch. (Refer to Chapter 4 of
Either give a frequency command by current input or set Pr. 73 Analog input selection, Pr. 267 Terminal 4
Corrective action
input selection, and voltage/current input switch to voltage input.
Operation Panel
E.USB
Indication
Name USB communication fault
When the time set in Pr. 548 USB communication check time interval has broken, this function stops the
Description
inverter output.
Check point Check the USB communication cable.
Check the Pr. 548 USB communication check time interval setting.
Check the USB communication cable.
Corrective action
Increase the Pr. 548 USB communication check time interval setting. Or, change the setting to 9999.
(Refer to Chapter 4 of
Operation Panel
E.4
Indication
Name
Converter overcurrent
The current flows in the regeneration converter module exceeds the specified value, protective circuit
Description
activates and stops the inverter output.
Check that sudden acceleration/deceleration is not performed.
Check for sudden load change.
Check point
Check that wiring is correct.
Check that instantaneous power failure did not occur.
Check that the thyristor load does not exist in the same power supply system.
Increase acceleration/deceleration time.
Keep load stable.
Corrective action
Wire the cables properly.
When a thyristor load exist in the same power supply system, install an AC reactor (FR-HAL).
Operation Panel
E.8
Indication
Name
Power supply fault
When overvoltage occurs in the converter side during input phase failure detection
When overvoltage occurs in the converter side during instantaneous power failure detection
When fault of power supply frequency is detected
Description
When phase shift is not detected
When any of the above conditions applied, it is judged as power supply and the inverter output is
stopped.
Check point
Check the power supply and wiring.
Corrective action
Perform wiring correctly.
FR-PU04 Fault 14
FR-PU07 VFD Comm error
FR-PU04 Fault 14
FR-PU07 Analog in error
the Instruction Manual (Applied).)
FR-PU04 Fault 14
FR-PU07 USB comm error
the Instruction Manual (Applied))
FR-PU04
Fault 4
FR-PU07
FR-PU04
Fault 8
FR-PU07
Causes and corrective actions
5
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