Mitsubishi Electric 800 Series Instruction Manual page 646

Abbreviation E.ECT
Name
Signal loss detection
The inverter trips when the encoder signal is shut off under orientation control, encoder feedback control or
Description
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 point
• 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
Corrective action
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.
Abbreviation
E.OD
Name
Excessive position fault
The inverter trips when the difference between the position command and position feedback exceeds Pr.427
Description
Excessive level error under position control.
• Check that the position detecting encoder mounting orientation matches the parameter.
Check point
• Check that the load is not large.
• Check that the Pr.427, Pr.369 (Pr.851) Number of encoder pulses settings are correct.
• Check the parameters.
Corrective action
• Reduce the load.
• Set Pr.427, Pr.369 (Pr.851) correctly.
Abbreviation E.MB1 to 7
Name
Brake sequence fault
• The inverter trips when a sequence error occurs during use of the brake sequence function (Pr.278 to
Description
Pr.285). This protective function is not available in the initial status. (The brake sequence function is invalid.)
(For the details of fault record, refer to
Check point
Find the cause of the fault occurrence.
Corrective action
Check the set parameters and perform wiring properly.
Abbreviation
E.EP
Name
Encoder phase fault
The inverter trips when the rotation command of the inverter differs from the actual motor rotation direction
Description
detected from the encoder during offline auto tuning. This protective function is not available in the initial
status.
• Check for mis-wiring of the encoder cable.
Check point
• Check if the Pr.359 (Pr.852) Encoder rotation direction setting is incorrect.
• Perform connection and wiring securely.
Corrective action
• Change the Pr.359 (Pr.852) setting.
Vector Vector Vector
Vector Vector Vector
Causes and corrective actions
FR-LU08 Encoder signal loss
FR-PU07 E.ECT
FR-LU08 Position fault
FR-PU07 E.Od
FR-LU08
E.MB1 Fault to E.MB7 Fault
FR-PU07
page 457.)
FR-LU08
Encoder wiring
FR-PU07
PROTECTIVE FUNCTIONS
page 61.)
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