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Operation Panel
E.BE
Indication
Name
Brake transistor alarm detection
This function stops the inverter output if an alarm occurs in the brake circuit, e.g. damaged brake transistors.
Description
In this case, the inverter must be powered OFF immediately.
· Reduce the load inertia.
Check point
· Check that the frequency of using the brake is proper.
Corrective action
Replace the inverter.
Operation Panel
E.UVT
Indication
Name
Undervoltage
If the power supply voltage of the inverter decreases, the control circuit will not perform normal functions.
In addition, the motor torque will be insufficient and/or heat generation will increase. To prevent this, if
the power supply voltage decreases below about 150VAC (300VAC for the 400V class), this function
Description
stops the inverter output.
When a jumper is not connected across P/+ and P1, the undervoltage protective function is activated.
When undervoltage protection is activated, the IPF signal is output. (Refer to page 270)
· Check for start of large-capacity motor.
Check point
· Check that a jumper or DC reactor is connected across terminals P/+ and P1.
· Check the power supply system equipment such as the power supply.
Corrective action
· Connect a jumper or DC reactor across terminals P/+ and P1.
If the problem still persists after taking the above measure, please contact your sales representative.
Operation Panel
E.ILF
Indication
Name
Input phase loss
This fault is output when function valid setting (= 1) is set in Pr. 872 Input phase loss protection selection
Description
and one phase of the three phase power input is lost. When the setting of Pr. 872 Input phase loss
protection selection is the initial value (Pr. 872 = "0"), this fault does not occur. (Refer to page 280.)
Check point
Check for a break in the cable for the three-phase power supply input.
· Wire the cables properly.
Corrective action
· Repair a break portion in the cable.
· Check the Pr. 872 Input phase loss protection selection setting.
Operation Panel
E.OLT
Indication
Name
Stall prevention stop
If the frequency has fallen to 0.5Hz by stall prevention operation and remains for 3s, a fault (E.OLT)
appears and trips the inverter. OL appears while stall prevention is being activated.
When speed control is performed by Real sensorless vector control or vector control, a fault (E.OLT) is
Description
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 the motor for use under overload. (Refer to page 152.)
Check point
· 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.)
· Reduce the load weight.
Corrective action
· 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
E.GF
Indication
Name
Output side earth (ground) fault overcurrent
This function stops the inverter output if an earth (ground) fault overcurrent flows due to an earth
Description
(ground) fault that occurred on the inverter's output (load) side.
Check point
Check for an earth (ground) fault in the motor and connection cable.
Corrective action
Remedy the earth (ground) fault portion.
Causes and corrective actions
FR-PU04
Br. Cct. Fault
FR-PU07
FR-PU04
Under Voltage
FR-PU07
FR-PU04
Fault 14
FR-PU07
Input phase loss
FR-PU04
Stll Prev STP
FR-PU07
FR-PU04
Ground Fault
FR-PU07
5
419
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