Mitsubishi Electric FR-A700 Instruction Manual page 737

Troubleshooting
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
FR-A700 EC
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 RS-485 terminal is shorted, this function shuts off the power output.
At this time, communication from the RS-485 terminal 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 terminal is connected correctly.
1) Check the PU and cable.
2) Check the connection of the RS-485 terminal.
E.MB1 to
to
E.MB7
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
Overspeed 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 enco-
der 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 enco-
der pulses.
Set Pr. 285 "Excessive speed deviation detection frequency" and Pr. 853 "Speed devia-
tion time" correctly.
Keep load stable.
Set the correct number of encoder pulses in Pr. 369 "Number of encoder pulses".
Causes and corrective actions
FR-PU04 —
FR-PU07 E.CTE
FR-PU04 —
FR-PU07 E.MB1 Fault to E.MB7 Fault
FR-PU04
E.OS
FR-PU07
FR-PU04
E.OSd
FR-PU07
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