Mitsubishi Electric FR-F800, Instruction Manual

Page: 749 / 834

Protective functions Causes and corrective actions
FR-F800 6 - 29
Operation panel
indication
E.LCI FR-LU08 4 mA input fault
Name 4 mA input fault
Description
The inverter trips 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 page 5-258.) This function is not available in the initial status.
Check point
Check for a break in the wiring for the analog current input.
Check that the Pr. 778 setting is not too short.
Corrective action
Check the wiring for the analog current input.
Set the Pr. 778 setting larger.
Operation panel
indication
E.PCH FR-LU08 Pre-charge fault
Name Pre-charge fault
Description
The inverter trips when the pre-charge time exceeds Pr. 764 "Pre-charge time limit".
The inverter trips when the measured value exceeds Pr. 763 "Pre-charge upper detection
level" during pre-charging.
This function is available when Pr. 764 and Pr. 763 are set. This protective function is not
available in the initial status.
Check point
Check that the Pr. 764 setting is not too short.
Check that the Pr. 763 setting is not too small.
Check that the Pr. 127 "PID control automatic switchover frequency" setting is not too low.
Check for a break in the connection to the pump.
Corrective action
Set the Pr. 764 setting longer.
Set the Pr. 763 setting larger.
Set the Pr. 127 setting higher.
Check the connection to the pump.
Operation panel
indication
E.PID FR-LU08 PID signal fault
Name PID signal fault
Description
The inverter trips if the measured value exceeds the PID upper limit or PID lower limit parameter
setting, or the absolute deviation value exceeds the PID deviation parameter setting during PID
control.
Set this function in Pr. 131 "PID upper limit", Pr. 132 "PID lower limit", Pr. 553 "PID deviation limit",
and Pr. 554 "PID signal operation selection". (Refer to page 5-347.)
The inverter trips when the input pressure reaches the fault level under PID input pressure
control. Use Pr. 1370 "Detection time for PID limiting operation" and Pr. 1379 "PID input pressure
fault level" to set the function. (Refer to page 5-398.)
This protective function is not available in the initial status.
Check point
Check the meter for a failure or break.
Check that the parameter settings are correct.
Corrective action
Check that the meter has no failure or break.
Set the parameters correctly.