Mitsubishi Electric FR-V500 Series Instruction Manual page 83

Errors (Alarms)
Control Panel
Indication
Name
Description
Check point
Corrective action
Control Panel
Indication
Name
Description
Check point
Corrective action
Control Panel
Indication
Name
Description
Check point
Corrective action
Control Panel
Indication
Name
Description
Check point
Corrective action
Control Panel
Indication
Name
Description
Check point
Corrective action
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).
• If (detection frequency) - (output frequency) > Pr. 285 under vector control, E.MB1 occurs and the
inverter output is stopped.
Find the cause of alarm occurrence.
Check the set parameters and perform wiring properly.
E.OS
Overspeed occurrence
Indicates that the motor speed has exceeded the overspeed setting level.
• Check that the Pr. 374 "overspeed detection level" value is correct.
• Check that the number of encoder pulses 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. 851.
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 Pr. 870 "speed deviation level" and Pr. 871 "speed deviation time" values are
correct.
• Check for sudden load change.
• Check that the number of encoder pulses differ from the actual number of encoder pulses.
• Set the Pr. 870 "speed deviation level" and Pr. 871 "speed deviation time" values correctly.
• Keep load stable.
• Set the correct number of encoder pulses in Pr. 851.
E.ECT
Signal loss detection
Stops the inverter output if the encoder signal is shut off.
• Check for the encoder signal loss.
• Check that the encoder specifications are correct.
• Check for a loose connector.
• Check that the jumper connector of the rear of the control terminal is correctly set.
• Remedy the break in the cable.
• Use the encoder that meets the specifications.
• Make connection securely.
• Set the jumper connector of the rear of the control terminal correctly. (Refer to page 12.)
E.OD
Position error large
Indicates that the difference between the position command and position feedback exceeded the
reference.
• Check that the position detecting encoder mounting orientation matches the parameter.
• Check that the load is not large.
• Check that the Pr. 427 "excessive level error" and Pr. 851 "number of encoder pulses" values are
correct.
• Check the parameters.
• Reduce the load weight.
• Set the Pr. 427 "excessive level error" and Pr. 851 "number of encoder pulses" values correctly.
FR-PU04V
to
FR-PU04V Overspeed occurrence
FR-PU04V Excessive speed deflection
FR-PU04V No encoder signal
FR-PU04V Excessive position error
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