Mitsubishi Electric FR-A700 EC, Инструкция по эксплуатации

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Troubleshooting Causes and corrective actions
FR-A700 EC 7 - 15
Operation Panel
Indication
E.ILF
FR-PU04 Fault 14
FR-PU07 Input phase loss
Name Input phase failure
Description
This alarm is output when function valid setting (=1) is set in Pr. 872 "Input phase failure
protection selection" and one phase of the three phase power input opens. (Refer to
section 6.17.3.)
Check point Check for a brake in the cable for the three-phase power supply input.
Corrective action
앫
Wire the cables properly.
앫
Repair a brake portion in the cable.
앫
Check the Pr. 872 "Input phase failure protection selection" setting.
Operation Panel
Indication
E.OLT
FR-PU04
FR-PU07
Stall Prev STP ( OL shown during
stall prevention operation)
Name Stall prevention
Description
If the frequency has fallen to 0.5Hz by stall prevention operation and remains for 3s, an
alarm (E.OLT) appears to shutoff the inverter output. OL appears while stall prevention is
being activated.
When speed control is performed by real sensorless vector control or vector control, an
alarm (E.OLT) is displayed and the inverter output is stopped if frequency drops to the Pr.
865 "Low speed detection" (initial value is 1.5Hz) setting by torque limit operation and the
output torque exceeds Pr. 874 "OLT level setting" (initial value is 150%) setting and
remains for more than 3s.
Check point
앫
Check the motor for use under overload. (Refer to section 6.7.4).
앫
Check that the Pr. 865 "Low speed detection" and Pr. 874 OLT level setting values are
correct. (Check the Pr. 22 "Stall prevention operation level" setting if V/F control is
exercised.)
Corrective action
앫
Reduce the load weight.
앫
Change the Pr. 22 "Stall prevention operation level", Pr. 865 "Low speed detection" and
Pr. 874 "OLT level setting" values. (Check the Pr. 22 "Stall prevention operation level"
setting if V/F control is exercised.)
Operation Panel
Indication
E.GF
FR-PU04
FR-PU07
Ground Fault
Name Output side earth fault over current protection
Description
This function stops the inverter output if an earth fault over current flows due to an earth
(ground) fault that occurred on the inverter's output (load) side.
Check point Check for an earth fault in the motor and connection cable.
Corrective action Remedy the earth fault portion.
Operation Panel
Indication
E.LF
FR-PU04
FR-PU07
—
Name Output phase failure protection
Description
This function stops the inverter output if one of the three phases (U, V, W) on the inverter’s
output side (load side) opens.
Check point
앫
Check the wiring (Check that the motor is normal.)
앫
Check that the capacity of the motor used is not smaller than that of the inverter.
Corrective action
앫
Wire the cables properly.
앫
Check the Pr. 251 "Output phase failure protection selection" setting.