Mitsubishi Electric FR-A800 Series Instruction Manual page 797

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
796
6. PROTECTIVE FUNCTIONS
6.5 Causes and corrective actions
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E.ECT
Signal loss detection
The inverter output is shut off when the encoder signal is shut off under orientation control, encoder feedback
control or vector control. This protective function is not available in the initial status.
• Check for the encoder signal loss.
• Check that the encoder specifications are correct.
• Check for a loose connector.
• Check that the switch setting of a Vector control compatible option is correct.
• Check that the power is supplied to the encoder. Alternatively, check that the power is not supplied to the
encoder later than the inverter.
• Check that the voltage of the power supplied to the encoder is the same as the encoder output voltage.
• Remedy the signal loss.
• Use an encoder that meets the specifications.
• Make connection securely.
• Make a switch setting of a Vector control compatible option correctly. (Refer to
• 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 sent to the inverter, check that the encoder signal is properly sent
and set "0 (initial value)" in Pr.376 Encoder signal loss detection enable/disable selection to disable signal
loss detection.
• Make the voltage of the power supplied to the encoder the same as the encoder output voltage.
E.OD
Vector Vector Vector
Excessive position fault
The inverter output is shut off when the difference between the position command and position feedback
exceeds the setting of Pr.427 Excessive level error during position control. This protective function is not
available in the initial status.
• Check that the position detecting encoder mounting orientation matches the parameter.
• Check that the load is not large.
• Check that the settings of Pr.427 and Pr.369 (Pr.851) Number of encoder pulses are correct.
• Check the parameters.
• Reduce the load.
• Set Pr.427 and Pr.369 (Pr.851) correctly.
E.ECA
Vector Vector Vector
Encoder signal loss for orientation
The inverter output is shut off when the machine end encoder signal is shut off during machine end orientation
control under Vector control. This protective function is not available in the initial status.
• Check for the encoder signal loss.
• Check that the encoder specifications are correct.
• Check for a loose connector.
• Check that the switch setting of a Vector control compatible option is correct.
• Check that the power is supplied to the encoder. Alternatively, check that the power is not supplied to the
encoder later than the inverter.
• Check that the voltage of the power supplied to the encoder is the same as the encoder output voltage.
• Remedy the signal loss.
• Use an encoder that meets the specifications.
• Make connection securely.
• Make a switch setting of a Vector control compatible option correctly. (Refer to
• 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 sent to the inverter, check that the encoder signal is properly sent
and set "0 (initial value)" in Pr.376 Encoder signal loss detection enable/disable selection to disable signal
loss detection.
• Make the voltage of the power supplied to the encoder the same as the encoder output voltage.
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FR-LU08 indication Encoder signal loss
page
FR-LU08 indication Position fault
FR-LU08 indication ENC direction fault
page
88.)
88.)