20 Most Recent Inverter KEB COMBIVERT F5 Questions & Answers

It means that the signals between the inverter and feedback device are being lost. This is due to a cable breakage, defective encoder/resolver, or loose connection, possible defective feedback card.

Do you mean no_Pu error? Reason for error = 24Vdc is being applied to the control card but the mains voltage is not being applied to the power stage.

Registered users on the KEB website have access to the manuals which will provide details on programming the inverters.

E.UP = Under voltage Check your supply voltage. E.OC = Over current Check for shorts between the inverter and motor.

If you are continually replacing the inverters, there may be an external issue causing the failures. If you are continually replacing IGBT's on the same inverter, then there is most likely a problem with the circuit controlling the IGBT's.

Please see:

What is the actual problem you are having?

This may be due to the inverter waiting for an ST signal via buss communications. What is the part # of the unit in question? The inverter is recognizing that terminal 16 is going active but still waiting for another command to enable the inverter.

E.puch means that at power up the control card did recognized the power stage as different than last time it powered up. This is normal when the control card is changed. If the control card has not been changed, there is a problem between the power stage and the control card. Initialize the value at sy.03 to reset the error.

I would guess that this is off of a Rieter machine (C51 Carding Machine). They would be your best source of information. Verify that the unit is properly programmed and that the control wires are correct.

Too much current is being required with the motor shaft not rotating. This is most likely a parameter adjustment issue with the motor data, torque limits and protective functions. Possible motor issue as well.

no_PU = No power unit. 24Vdc is being supplied to the control card with no AC voltage (230 or 400) being supplied to L1/L2/L3. Verify AC voltage is present at L1/L2/L3. *If not present, apply voltage and no_PU should clear. *If present and unit still no_PU, there is a problem with the power stage. At that point unit should be replaced or repaired.

Here is how to use the keypad. If a decimal shows up after the value is changed, enter must be pressed to save the value. Also insure that the inverter is not enabled or in nOP status.

With out knowing what the error codes are that are being displayed, it is impossible to provide a solution.

Verify the mains voltage at terminals L1/L2/L3. If it is present but the inverter does not power up, there is most likely an internal problem. What is the part# of the unit in question?

Vmi is not a KEB fault code.

The does not appear to be a KEB error code.

This does not appear to be a KEB error code. If this code is on on your HMI, contact the machine manufacture to determine what this error means.

The system that you described is a closed-loop system. The inverter tells the motor what to do and the encoder send information back to the inverter to verify the operations. With out knowing part# and serial number of the unit in question, I do not know exactly which inverter you are having problems with. With E.OC error, there is a lot of current demand on the inverter. This could mean a short in the motor, motor leads, connections or inside of the inverter. This could also be caused by the encoder feedback loop being defective. If the inverter tells the motor to run at 1000rpm and the feedback tells the inverter it is only running at 5rpm, the inverter will send out more current to get the motor up to speed. Since you are getting multiple errors, there could be other internal problems with the inverter especially if the unit is old and contaminated internally.