Mitsubishi Electric FR-A820-00046 Instruction Manual page 1074

Causes and corrective actions
Operation panel
indication
Name
Description
Check point
Corrective action
6 - 34
E.ECT
Signal loss detection
The inverter trips 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 page 2-73.)
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.
Protective functions
FR-LU-08 Encoder signal loss