Mitsubishi Electric FR-A760 Series Instruction Manual page 411

Causes and corrective actions
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
400
E. 6
E. 7
E.CPU
CPU fault
Stops the inverter output if the communication error of the built-in CPU occurs.
Check for devices producing excess electrical noises around the inverter.
· Take measures against noises if there are devices producing excess electrical noises around the
inverter.
· Please contact your sales representative.
E.CTE
Operation panel power supply short circuit, RS-485 terminal power supply short circuit
When the operation panel power supply (PU connector) is shorted, this function shuts off power output
and stops the the inverter output. At this time, the operation panel (parameter unit) cannot be used and
RS-485 communication from the PU connector cannot be made. When the internal power supply for
the RS-485 terminals are shorted, inverter trips.
At this time, communication from the RS-485 terminals cannot be made.
To reset, enter the RES signal or switch power off, then on again.
1. Check for a short circuit in the PU connector cable.
2. Check that the RS-485 terminals are connected correctly.
1. Check the PU and cable.
2. Check the connection of the RS-485 terminals
E.MB1 to 7
Brake sequence fault
The inverter output is stopped when a sequence error occurs during use of the brake sequence
function (Pr. 278 to Pr. 285). This protective function does not function in the initial status (brake
sequence function is invalid). (Refer to page 205)
Find the cause of alarm occurrence.
Check the set parameters and perform wiring properly.
E.OS
Overspeed occurrence
Stops the inverter output when the motor speed exceeds the Pr.374 Overspeed detection level during
encoder feedback control, real sensorless vector control and vector control.
This protective function does not function in the initial status.
· Check that the Pr. 374 Overspeed detection level value is correct.
· Check that the number of encoder pulses does not differ from the actual number of encoder pulses.
· Set the Pr. 374 Overspeed detection level value correctly.
· Set the correct number of encoder pulses in Pr. 369 Number of encoder pulses.
E.OSD
Speed deviation excess detection
Stops the inverter output if the motor speed is increased or decreased under the influence of the load
etc. during vector control with Pr. 285 Excessive speed deviation detection frequency set and cannot be
controlled in accordance with the speed command value.
This protective function does not function in the initial status.
· Check that the values of Pr. 285 Excessive speed deviation detection frequency and Pr. 853 Speed deviation
time are correct.
· Check for sudden load change.
· Check that the number of encoder pulses does not differ from the actual number of encoder pulses.
· Set Pr. 285 Excessive speed deviation detection frequency and Pr. 853 Speed deviation time correctly.
· Keep load stable.
· Set the correct number of encoder pulses in Pr. 369 Number of encoder pulses.
Fault 6
FR-PU04
Fault 7
FR-PU07
CPU Fault
⎯⎯
FR-PU04
FR-PU07 E.CTE
⎯⎯
FR-PU04
to
FR-PU07 E.MB1 Fault to E.MB7 Fault
FR-PU04
E. OS
FR-PU07
FR-PU04
E. OSd
FR-PU07