Mitsubishi Electric 800 Series Instruction Manual page 581

Abbreviation
Name
Description
Check point
Corrective action
Abbreviation
Name
Description
Check point
Corrective action
Abbreviation
Name
Description
Check point
Corrective action
Abbreviation
Name
Description
Check point
Corrective action
Abbreviation
Name
Description
Check point
Corrective action
580
6. PROTECTIVE FUNCTIONS
6.4 Causes and corrective actions
E.LF
Output phase loss
The inverter trips 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 motor control)
• Wire the cables properly.
• Input a start command after the motor stops. (PM motor control)
E.OHT
External thermal relay operation
The inverter trips 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 trips if resistance of the PTC thermistor connected between the 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, Pr.1016 setting.
• Check the motor for operation under overload.
Reduce the load.
E.OPT
Option fault
• Appears when the AC power supply is connected to the terminal R/L1, S/L2, or T/L3 accidentally when
Pr.30 Regenerative function selection = "2 or 102".
• 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 if "2 or 102" is set in Pr.30.
• Check for the password lock with a setting of Pr.296 = "0, 100".
• Check the Pr.30 setting and wiring.
• The setting values "2 and 102" of Pr.30 are for manufacturer setting. Do not set.
• 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
170.)
E.OP1
Communication option fault
The inverter trips if a communication line error occurs in the communication option.
• Check for an incorrect option function setting and operation.
• Check that the plug-in option is plugged into the connector properly.
• Check for a break in the communication cable.
• Check that the terminating resistor is fitted properly.
• Check the option function setting, etc.
• Connect the plug-in option securely.
• Check the connection of communication cable.
FR-LU08 Output phase loss
FR-PU07 E.LF
FR-LU08 Ext TH relay oper
FR-PU07 OH Fault
FR-LU08 PTC thermistor oper
FR-PU07 PTC activated
FR-LU08 Option Fault
FR-PU07
FR-LU08 Option1 Fault
FR-PU07
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