Mitsubishi Electric FR-A720-00030-NA Instruction Manual page 436

Operation Panel
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
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 page 291.)
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
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 page 368)
Operation Panel
Indication
Name Opposite rotation deceleration fault
The speed may not decelerate during low speed operation if the rotation direction of the speed
command and the estimated speed differ when the rotation is changing from forward to reverse or from
Description
reverse to forward during torque control under Real sensorless vector control. At this time, the inverter
output is stopped if the rotation direction will not change, causing overload. This fault is not available in
the initial status (V/F control). (It is available only during Real sensorless vector control.)
Check that the rotation direction is not switched from forward to reverse rotation (or from reverse to
Check point
forward) during torque control under Real sensorless vector control.
· Prevent the motor from switching the rotation direction from forward to reverse (or from reverse to
Corrective action
forward) during torque control under Real sensorless vector control.
· Please contact your sales representative.
Operation Panel
Indication
Name
Internal circuit fault
Description
Stop the inverter output when an internal circuit fault occurred.
Corrective action
Please contact your sales representative.
CAUTION
• If protective functions of E.ILF, E.PTC, E.PE2, E.EP, E.OD, E.CDO, E.IOH, E.SER, E.AIE, E.USB are activated when using the
FR-PU04, "Fault 14" appears.
Also when the faults history is checked on the FR-PU04, the display is "E.14".
• If faults other than the above appear, contact your sales representative.
E.SER
E.AIE
E.USB
E.11
E.13
Causes and corrective actions
FR-PU04 Fault 14
FR-PU07 VFD Comm error
FR-PU04 Fault 14
FR-PU07 Analog in error
FR-PU04 Fault 14
FR-PU07 USB comm error
FR-PU04
Fault 11
FR-PU07
FR-PU04
Fault 13
FR-PU07
5
425