Commutation error during regular operation (very rare)

Under special operating conditions the regular operation of the axes can fulfil the three conditions cited above and therefore trigger this error message despite correct commutation. A number of examples are given below which, however, occur very seldom:

  1. When the servo drive is operating at the limit (conditions 1 and 3 are met) and external forces cause an opposing torque which then fulfils condition 2, the servo drive generates a commutation error.
  2. The servo drive is operating at the limit (conditions 1 and 3 are met) and an oscillating current is produced due to a rapid change of direction or speed. Condition 2 is then also met and a commutation error arises.

If these examples do not apply to your application, analyze the application and try to find the cause. If you are unable to remedy the cause but still wish to operate the axis, there is only one option for suppressing the commutation error:

Parameterize the value of the IDN P-0-0069 to the permitted maximum speed of the motor so that point 1 of the above-mentioned factors cannot apply and the commutation error will no longer appear.

WARNING

Warning, risk of injury from uncontrolled movements!

Increasing the value of the IDN "P-0-0069" to the highest speed always means that the commutation monitoring will no longer cause errors, even when other conditions actually call for this. This is particularly critical when the motor is being replaced. If the value of the IDN "P-0-0069" is NOT reset, then uncontrolled movements of the motor may occur. Beckhoff recommends that you should NOT increase the value of the IDN "P-0-0069".

Commutation error during regular operation (very rare) 1:

Drive design

As a rule the drive should not be designed at the limit i.e. the current power should reach a max. of 90% of the P-0-0092 "Configured channel peak current" value.