152
Causes and corrective actions
Operation Panel
Indication
E.OS
FR-PU04
FR-PU07
E. OS
Name
Overspeed occurence
Description
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 point
· 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.
Corrective action
· Set the
Pr. 374 Overspeed detection level
value correctly.
· Set the correct number of encoder pulses in
Pr. 369 Number of encoder pulses
.
Operation Panel
Indication
E.OSD
FR-PU04
FR-PU07
E. OSd
Name
Speed deviation excess detection
Description
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
Speed deviation excess 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 point
· Check that the values of
Pr. 285 Speed deviation excess 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.
Corrective action
· Set
Pr. 285 Speed deviation excess 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
.
Operation Panel
Indication
E.ECT
FR-PU04
FR-PU07
E. ECT
Name
Signal loss detection
Description
Trips the inverter output when the encoder signal is shut off under orientation control, encoder
feedback control or vector control.
This protective function does not function in the initial status.
Check point
· Check for the encoder signal loss.
· Check that the encoder specifications are correct.
· Check for a loose connector.
· Check that the switch setting of the FR-A7AP is correct.
· Check that the power is supplied to the encoder. Or, check that the power is not supplied to the
encoder later than the inverter.
Corrective action
· Remedy the signal loss.
· Use an encoder that meets the specifications.
· Make connection securely.
· Make a switch setting of the FR-A7AP correctly.
(Refer to page 29)
· Supply the power to the encoder. Or supply the power to the encoder at the same time when the
power is supplied to the inverter.
If the power is supplied to the encoder after the inverter, check that the encoder signal is securely
sent and set "0" in
Pr. 376
.
Operation Panel
Indication
E.OD
FR-PU04
FR-PU07
Fault 14
E. Od
Name
Excessive position error
Description
Stops the inverter output when the difference between the position command and position feedback
exceeds
Pr. 427
Excessive level error
under position control.
This protective function does not function in the initial status.
Check point
· 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. 369 Number of encoder pulses
are correct.
Corrective action
· Check the parameters.
· Reduce the load weight.
· Set the
Pr. 427 Excessive level error
and
Pr. 369 Number of encoder pulses
correctly.
Содержание FR-A741-11K
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