Mitsubishi Electric 800 Series, Инструкция по эксплуатации, Страница: 646 / 727

Causes and corrective actions
PROTECTIVE FUNCTIONS
645
6 5
Abbreviation E.ECT
FR-LU08 Encoder signal loss
FR-PU07 E.ECT
Name
Signal loss detection
Description
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 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 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.
Corrective action
• 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 61 .)
• 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.
Abbreviation
E.OD
FR-LU08 Position fault
FR-PU07 E.Od
Name
Excessive position fault
Description
The inverter trips when the difference between the position command and position feedback exceeds Pr.427
Excessive level error under position control.
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, Pr.369 (Pr.851) Number of encoder pulses settings are correct.
Corrective action
• Check the parameters.
• Reduce the load.
• Set
Pr.427, Pr.369 (Pr.851) correctly.
Abbreviation E.MB1 to 7
FR-LU08
FR-PU07
E.MB1 Fault to E.MB7 Fault
Name
Brake sequence fault
Description
• The inverter trips when a sequence error occurs during use of the brake sequence function (Pr.278 to
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 page 457 .)
Check point
Find the cause of the fault occurrence.
Corrective action
Check the set parameters and perform wiring properly.
Abbreviation
E.EP
FR-LU08
FR-PU07
Encoder wiring
Name
Encoder phase fault
Description
The inverter trips when the rotation command of the inverter differs from the actual motor rotation direction
detected from the encoder during offline auto tuning. This protective function is not available in the initial
status.
Check point
• Check for mis-wiring of the encoder cable.
• Check if the
Pr.359 (Pr.852) Encoder rotation direction setting is incorrect.
Corrective action
• Perform connection and wiring securely.
• Change the
Pr.359 (Pr.852) setting.
Vector Vector Vector
Vector Vector Vector