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KEB F5 Inverter error E. OH Error overheat power module this alarm always sowing how to solve this problem. Please help me

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Error E. OH (overheat power module) on a KEB F5 Inverter indicates that the power module is overheating. This can be caused by a variety of factors, including a malfunctioning cooling system, a faulty power module, or a problem with the wiring or connections.
To troubleshoot the issue, you can try the following steps:

  1. Check the cooling system for any visible signs of damage or malfunction, such as a clogged air filter or damaged fan.
  2. Check the power module for any visible signs of damage or malfunction, such as burnt or damaged components.
  3. Check the wiring and connections to ensure that they are secure and properly connected.
  4. Check the F5 Inverter's fuse and circuit breaker to ensure that they are functioning properly.
If these steps do not resolve the issue, it's best to contact a professional repair service or the manufacturer for further assistance. They will be able to diagnose the problem and recommend the appropriate repairs. It's also a good idea to stop using the F5 Inverter until the issue has been resolved, as continuing to use it may cause further damage.

Posted on Jan 07, 2023

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https://www.fixya.com/support/t17870150-keb_07_f5_error_code_e_puch_will_cause
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My KEB drive shows alarm "E.nOH" or "E.OH" or E.OH2, what does it mean?? How I will solve it. My motor and drive temperature is still normal but drive shows these alarm.
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KEB uses these error mesages on the CombiVert F6, https://www.keb.de/fileadmin/media/Manuals/f5/control/f5m/00f5mebk320.pdf .

I hope this helps.

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Oct 21, 2016 • Electronics - Others
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Always showing alarm EOC,EOP
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.
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The E.pu error is a general power stage failure.
Typically means that the unit has a defective power stage that would need to be replaced.
If it is an old inverter(early 2000's) there is a possibility that it could be a cooling fan problem since at that time there was a three wire fan used. May be able to replace the fan (must obtain from KEB) but there may still be problems with power stage. If it is from early 2000's then you might be better off replacing the unit with new current version.
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How can we fixed if the error display is E.EnC1
There is a problem with the channel 1 feedback loop.

Possible causes:
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The KEB inverter does not have a "COM" error.

Where is this error being displayed?

Check your inverter baud rate, inverter address, communications cables and device that is being used to communicate.
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Verify that the cooling fans are operational and that the heatsink is actually hot to the touch.

If the heatsink is not hot to the touch there is perhaps a problem with the temp. sensors in the inverter.
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