Mitsubishi Electric FR-A700 Series Instruction Manual page 145

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
Operation Panel
Indication
Name
Description
Check point
Corrective action
140
E.RET
Retry count excess
If operation cannot be resumed properly within the number of retries set, this function stops the inverter
output.
Find the cause of alarm occurrence.
Eliminate the cause of the error preceding this error indication.
E. 6
E. 7
E.CPU
CPU error
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 the power
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 power supply for the RS-485 terminals are shorted,
this function shuts off the power output.
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 error
The inverter output is stopped when a sequence error occurs during use of the brake sequence
function (Pr. 278 to Pr. 285).
Find the cause of alarm occurrence.
Check the set parameters and perform wiring properly.
E.OS
Over speed occurence
Appears when the motor speed reaches and exceedes the overspeed setting level under encoder
feedback control or vector control.
· 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 and cannot be controlled in accordance with the speed command value.
· 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.
FR-PU04
Retry No Over
FR-PU07
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
Overspeed occurrence
FR-PU07
FR-PU04
Excessive speed deflection
FR-PU07