Servo driver P3 alarm 41075 when it driver motor

Hello,
I have a question about acopos P3 44A driver. When it drive a motor in high speed ,it alarm 41075.

info below
41075 : ACOPOS continuous power: Warning limit exceeded

41075: ACOPOS continuous power: Warning limit exceeded

Info:
Data type:

Description:
Runtime warning if the ACOPOS continuous power LOAD_POWER exceeds 95%.

Reaction:
None

I want to know the LOAD_POWER is limited by the IGBT of inverter or the rectification of the driver. Because it is the max P3 driver at present , I can’t use another multi or acopos type driver for cost price .

If i use a bigger DC Power supply the P3 ,can it be ok to solve it?

Thanks

Hi @yun.tao welcome to our Community!

Warning 41075 means that the continuous power being output by the drive exceeds 95% of its rated maximum continuous power. If the load increases, you may start to see errors 9075 (load power > 100%) and 9076 (load power > 115%). The maximum value is listed in the user manual or the datasheet for the drive you’re using. For clarification, can you please tell us the model number of the drive you’re using as well as the AC power input to the drive? Also, are there any additional errors or warnings you’re seeing besides 41075? This error is often accompanied by temperature errors, but any other motion error that occurs around the same time could help with diagnosis.

Something else that would be helpful is tracing some parameters during a movement when the error occurs. Some ParIDs that would be useful are:

  • 16 - Rated power of the drive
  • 670 - Continuous load power
  • 844 - Power output to the motor

Another thing which might be interesting would be to compare the actual motor torque (ParID 277) to the rated torque of the motor. If this is a multi-axis drive, this comparison should be done for all axes. It’s possible that one of your motors is using more torque than it should be which may indicate a mechanical problem.

Something else to think about is, what causes the motor to use so much power? Does this happen at a certain point in your process, or is the motor consistently drawing a lot of power? Has this always been a problem, or did it occur after a recent change?

I don’t think that a larger power supply would help because, unless you’re getting additional power warnings, the input power to the drive is not an issue. The problem is that the motor is drawing more power from the drive than it is rated to provide.

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hi, Marcus,
Thank you for your answer.
Further information below,
My driver module number is 8EI044HWS10.0100-1,AC power input is 400V. Not any other additional error or warning besides 41075.
The value of ID670 increase continually when it drive motor in high speed.
ID214,max value is up to 65A.
Max value of ID844 is up to 21KW.
In project P3 8EI044HWS10.0100-1 drive motor individually.
One trace inverter ID214 and ID844 below,

Thank you again.

Hi @yun.tao, you’re welcome! I’m not a motion expert (at least compared to a lot of the smart people we have at B&R) but this is how I interpret your data:

  • As you said, the CONTINUOUS LOAD POWER is increasing continually as the motor is running
  • The ACTUAL STATOR CURRENT is steady around 58A (min = 50A and max = 65A)
  • The MOTOR TERMINAL POWER is steady around 15kW (min = 10 kW and max = 22 kW)

The technical specifications for your drive define the following limits:

  • Continuous power per motor - 18 kW
  • Peak power output - 45 kW
  • Continuous current per motor - 44 A
  • Peak current per motor - 110 A

These values assume

  • 560 VDC bus voltage
  • No derating due to mains voltage fluctuations or temperature

The Continuous Load Power (parameter which you’re receiving an error for) is calculated based on the DC bus voltage, the power being used by the motor, and the rated power of the drive (you can see an exact formula here). As you run the motor, it may exceed the continuous load power of the drive and this is okay for short periods (as long as you’re not exceeding the drive’s peak power output). However this can be a problem if the drive is putting out power faster than it can replenish the DC bus. It looks like your motor is hovering right around the continuous limit of the drive and often going over. This explains why you’re getting that error. As your motor runs, the drive is constantly putting out more than it is rated to continuously provide and therefore the CONTINUOUS LOAD POWER (as a percentage) continually increases. When it crosses the 95% threshold, warning 41075 is triggered. I’m assuming that if you were to continue running, the load power would continue to increase until more errors were triggered (but this depends entirely on why the motor is drawing so much power).

The amount of power your motor consumes depends on things such as:

  • The properties of the motor itself
  • The load attached to the motor
  • The tuning of the control parameters

You could try running the motor without a load to see if this makes a difference. You may be able to make mechanical changes to the load (increasing efficiency) to decrease the amount your motor has to work. It would also be a good idea to revisit the sizing that was completed to verify that the motor and drive combination chosen meets the requirements of the application, especially if those requirements have changed.

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