Mitsubishi Electric FR-A800, Instruction Manual

Page: 917 / 1042

Protective functions Causes and corrective actions
FR-A800 6 - 29
Operation panel
indication
E.CTE FR-LU-08 Circuit fault
Name Operation panel power supply short circuit/RS-485 terminal power supply short circuit
Description
앫
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.
앫
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 STOP/RESET key of the operation panel, enter the RES signal, or switch power
OFF then ON again.
Check point
앫
Check that the PU connector cable is not shorted.
앫
Check that the RS-485 terminals are connected correctly.
Corrective action
앫
Check PU and cable.
앫
Check the connection of the RS-485 terminals.
Operation panel
indication
E.P24 FR-LU-08 24 VDC power fault
Name 24 V DC power fault
Description
When the 24 V DC 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 point
앫
Check for a short circuit in the PC terminal output.
앫
Check that the 24 V external power supply voltage is correct.
Corrective action
앫
Repair the short-circuited portion.
앫
Supply the power at 24 V. (If the power at insufficient voltage is supplied to the 24 V 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.)
Operation panel
indication
E.CDO FR-LU-08 OC detect level
Name Abnormal output current detection
Description
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 point
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 page 5-377.)