Mitsubishi Electric FR-A800 Series Instruction Manual page 792

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
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E.LF
Output phase loss
The inverter output is shut off if one of the three phases (U, V, W) on the inverter's output side (load side) is lost.
• Check the wiring. (Check that the motor is normally operating.)
• Check that the capacity of the motor used is not smaller than that of the inverter.
• Check if a start command is given to the inverter while the motor is coasting. (PM sensorless vector control)
• Wire the cables properly.
• Input a start command after the motor stops. Alternatively, use the automatic restart after instantaneous power
failure/flying start function
E.OHT
External thermal relay operation
The inverter output is shut off if the external thermal relay provided for motor overheat protection or the internally
mounted thermal relay in the motor, etc. switches ON (contacts open). This function is available when "7" (OH
signal) is set in any of Pr.178 to Pr.189 (Input terminal function selection). This protective function is not
available in the initial status. (OH signal is not assigned.)
• Check for motor overheating.
• Check that the value "7" (OH signal) is set correctly to any of Pr.178 to Pr.189 (Input terminal function
selection).
• Reduce the load and operation duty.
• Even if the relay contacts are reset automatically, the inverter will not restart unless it is reset.
E.PTC
PTC thermistor operation
The inverter output is shut off if resistance of the PTC thermistor connected between terminal 2 and terminal 10
is equal to or higher than the Pr.561 PTC thermistor protection level setting for a continuous time equal to or
longer than the setting value in Pr.1016 PTC thermistor protection detection time. When the initial value
(Pr.561 = "9999") is set, this protective function is not available.
• Check the connection with the PTC thermistor.
• Check the Pr.561 and Pr.1016 settings.
• Check the motor for operation under overload.
Reduce the load.
E.OPT
Option fault
• Appears if the AC power supply is accidentally connected to terminal R/L1, S/L2, or T/L3 when a high power
factor converter (FR-HC2), multifunction regeneration converter (FR-XC in common bus regeneration mode),
or power regeneration common converter (FR-CV) is connected to the inverter while Pr.30 Regenerative
function selection = "2".
• Appears when torque command by the plug-in option is selected using Pr.804 Torque command source
selection and no plug-in option is mounted. This function is available under torque control.
• Appears when either one of a Vector control compatible plug-in option or a control terminal option (FR-A8TP)
is not installed during machine end orientation control.
• Appears when the switch for manufacturer setting of the plug-in option is changed.
• Appears when a communication option is connected while Pr.296 Password lock level = "0 or 100".
• Check that the AC power supply is not connected to terminal R/L1, S/L2, or T/L3 when the FR-HC2, FR-XC (in
common bus regeneration mode), or FR-CV is connected to the inverter while Pr.30 = "2".
• Check that the plug-in option for torque command setting is connected.
• Check that the Vector control plug-in option and the control terminal option (FR-A8TP) are installed correctly.
Check that the Pr.393 Orientation selection and Pr.862 Encoder option selection settings are correct.
• Check for the password lock with a setting of Pr.296 = "0, 100".
• Check the Pr.30 setting and wiring with the FR-HC2, FR-XC, or FR-CV.
• The inverter may be damaged if the AC power supply is connected to terminal R/L1, S/L2, or T/L3 when a high
power factor converter is connected. Contact your sales representative.
• Check for connection of the plug-in option. Check the Pr.804 setting.
• Install the Vector control plug-in option and the control terminal option (FR-A8TP) correctly. Set Pr.393 and
Pr.862 correctly. (Refer to
• Set the switch on the plug-in option, which is for manufacturer setting, back to the initial setting. (Refer to the
Instruction Manual of each option.)
• To apply the password lock when installing a communication option, set Pr.296 ≠ "0, 100". (Refer to
search engine
FR-LU08 indication Output phase loss
(page 635). (PM sensorless vector control)
FR-LU08 indication Ext TH relay oper
FR-LU08 indication PTC thermistor oper
FR-LU08 indication Option Fault
page 585.)
page 348.)
6. PROTECTIVE FUNCTIONS
6.5 Causes and corrective actions
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