Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 761

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
Operation panel
indication
Name
Description
Check point
Corrective action
Operation panel
indication
Name
Description
Check point
Corrective action
762
6. PROTECTIVE FUNCTIONS
6.5 Causes and corrective actions
E.MB1 to 7
Brake sequence fault
The inverter output is shut off 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
Find the cause of the fault occurrence.
Check the set parameters and perform wiring properly.
E.EP
Vector Vector Vector
Encoder phase fault
The inverter output is shut off 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 for mis-wiring of the encoder cable.
• Check if the Pr.359 (Pr.852) Encoder rotation direction setting is incorrect.
• Perform connection and wiring securely.
• Change the Pr.359 (Pr.852)setting.
E.MP
Vector Vector Vector
Magnetic pole position unknown
When the offset value between the PM motor home magnetic pole position and the home position of the encoder
(position detector) is unknown, the protective circuit is activated to stop the inverter output.
• Check that the encoder position tuning was performed.
• Check that the encoder position tuning ended properly. When Pr.1105 Encoder magnetic pole position
offset = "9999", the encoder position tuning does not end properly.
• Perform encoder position tuning with Pr.373 Encoder position tuning setting/status. (Refer to the Instruction
Manual of the encoder option.)
• Remove the cause of the tuning error, and perform tuning again. (Refer to the Instruction Manual of the encoder
option.)
E.IAH
Abnormal internal temperature (Standard models and IP55 compatible models only)
The inverter output is shut off when the inverter internal temperature reaches the specified value or higher.
• Check for too high surrounding air temperature.
• Check if the internal air circulation fan or the cooling fan stops due to a fault.
• Install an inverter suitable for the installation environment. (Refer to the Instruction Manual (Hardware) of the
FR-A806.)
• Replace the internal air circulation fan or the cooling fan.
E.LCI
4 mA input fault
The inverter output is shut off when the analog input current is 2 mA or less for the time set in Pr.778 4 mA input
check filter. This function is available when Pr.573 4 mA input check selection = "2 or 3". (Refer to
This protective function is not available in the initial status.
• Check for a break in the wiring for the analog current input.
• Check that the Pr.778 setting is not too short.
• Check the wiring for the analog current input.
• Set the Pr.778 setting larger.
to
FR-LU08 indication E.MB1 Fault to E.MB7 Fault
page 541.)
FR-LU08 indication Encoder phase fault
FR-LU08 indication MagnetPole Pos Fault
FR-LU08 indication Abnormal Intnl Temp
FR-LU08 indication 4 mA input fault
page 492.)