Mitsubishi Electric 800 Series Instruction Manual page 583

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
Abbreviation
Name
Description
Check point
Corrective action
582
6. PROTECTIVE FUNCTIONS
6.4 Causes and corrective actions
E.CPU
E. 5
E. 6
E. 7
CPU fault
The inverter trips if the communication fault of the built-in CPU occurs.
Check for devices producing excess electrical noises around the inverter.
• Take measures against noises if there are devices producing excess electrical noises around the inverter.
• Please contact your sales representative.
E.CTE
Operation panel power supply short circuit/RS-485 terminals power supply short circuit
• When the power supply for the operation panel (PU connector) is shorted, the power output is shutoff and
the inverter trips. The use of the operation panel (parameter unit) and the RS-485 communication via the
PU connector are disabled. To reset, enter the RES signal from the terminal, reset via communication
through the RS-485 terminals, or switch power OFF then ON again.
• When the power supply for the RS-485 terminals are short circuited, this function shuts off the power
output. At this time, communication from the RS-485 terminals cannot be made. To reset, use
the operation panel, enter the RES signal, or switch power OFF then ON again.
• Check that the PU connector cable is not shorted.
• Check that the RS-485 terminals are connected correctly.
• Check PU and the cable.
• Check the connection of the RS-485 terminals.
E.P24
24 VDC power fault
When the 24 VDC power output from the PC terminal is shorted, this function shuts off the power output. At
this time, all external contact inputs switch OFF. The inverter cannot be reset by entering the RES signal. To
reset it, use the operation panel, or switch power OFF, then ON again.
• Check for a short circuit in the PC terminal output.
• Check that the 24 V external power supply voltage is correct.
• Repair the short-circuited portion.
• Supply the power at 24 V. (If the power at insufficient voltage is supplied to the 24V input circuit for a long
time, the inverter internal circuit may heat up. Input power at correct voltage although it will not damage the
inverter.)
E.CDO
Abnormal output current detection
The inverter trips if the output current exceeds the Pr.150 Output current detection level setting.
This functions is available when Pr.167 Output current detection operation selection is set to "1". When
the initial value (Pr.167 = "0") is set, this protective function is not available.
Check the settings of Pr.150, Pr.151 Output current detection signal delay time, Pr.166 Output current
detection signal retention time, and Pr.167. (Refer to
E.IOH
Inrush current limit circuit fault (Standard models only)
The inverter trips when the resistor of the inrush current limit circuit is overheated. The inrush current limit
circuit failure
• Check that frequent power ON/OFF is not repeated.
• Check if the input side fuse (5A) in the power supply circuit of the inrush current limit circuit contactor (FR-
F860-02890 or higher) is blown.
• Check that the power supply circuit of inrush current limit circuit contactor is not damaged.
Configure a circuit where frequent power ON/OFF is not repeated. If the situation does not improve after taking
the above measure, please contact your sales representative.
FR-LU08 CPU Fault
FR-PU07
Fault 5
Fault 6
Fault 7
FR-LU08 Circuit fault
FR-PU07 E.CTE
FR-LU08 24 VDC power fault
FR-PU07 E.P24
FR-LU08 OC detect level
FR-PU07
page 307.)
FR-LU08 Inrush overheat
FR-PU07
on