Brake Test with MC_BR_BrakeControl

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1

Hello

i’m trying to implement a Brake Test for the internal Brake with the MC_BR_BrakeControl FB. I need this for a vertical axis with an external load where the testtorque depends on the direction. The MC_BR_BrakeControl has no direction parameter, so in which direction is the brake test performed? Or is there another FB for this case?

Greetings Oliver

2

Hello,

Due to this documentation i would think its the BrakeTestTorque which defines the direction. But i never made a Brake Test.

Brake Test Description

Greetings
Michael

3

Hello

Only a positive Value is allowed for the BrakeTestTorque. in the documentation i can only find this “The test torque direction is not defined for axes without a load.” but the MC_BR_BrakeControl has no input value for a load.

4

Hello,
Thanks for bringing up the limitation of the input, i did not checked the ParID info, you are correct.

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image398×300 4.78 KB

I understood that the “Load” is given by the “TORQUE_ACT” value at the Start of the Brake-Test.
"Actual torque TORQUE_ACT and actual position PCTRL_S_ACT are stored"

I may have to teach myself to this topic …

Greetings
Michael

5

Hello,

i used now a Testmotor and the Result looked like this.

First Test with TORQUE_ACT at start negative - Test Torque was applied positive

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image1039×496 19.8 KB

Second Test with TORQUE_ACT positive - Test Torque was applied negative

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image1039×393 17.3 KB

PROGRAM _INIT

	BrakeControl_0.Configuration.BrakeTest.PositionLimit := 10.0; 
	BrakeControl_0.Configuration.BrakeTest.TestDuration	 := 1.0; 
	BrakeControl_0.Configuration.BrakeTest.TestTorque	 := 0.4; 
	BrakeControl_0.Configuration.BrakeTest.TestMode		 := 0; 
	
	BrakeControl_0.Command :=  mcBRAKE_TEST_INIT + mcBRAKE_TEST_START; 
		
END_PROGRAM

PROGRAM _CYCLIC

	BrakeControl_0.Axis := ADR(gAxis01); 
	BrakeControl_0(); 
	
END_PROGRAM

Greetings
Michael

6

That resolved my problem thank you!

Greetings

7

Did you use MC_ReadActualTorque to determine the TORQUE_ACT value?

Greetings

8

Hello,

i used the Motion-Testwindow Motion-Trace to Trace the ParID 277 - TORQUE_ACT.
The only Program Code is shown in the post above.
All other Commands where executed in Motion-Testwindow.

Greetings
Michael

9

Thank you for your help!

Greetings

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