Simodrive 611U 2 problem with control holding brake

 I don't know what you described here in "Setting". By SOMOCOM U?

However, I give you some ideas for control brake.

#1--the motor brake is a holding brake--that means it is not like your car brake--you cannot use it to reduce speed or stop motor--you must waiting motor stop then applying brake.

#2--normally we don't use "take off control enable" to stop motor, but use moving command set to zero.   

#3--My idea to use brake --CNC axis for example. there are PLC interface signals call " Fine Position reached" --I think there must similar one in 611U, you can find in free I/O programming . When axis reach its position (you programmed position), you will get "1" logical , which can be use to active you brake.At this time control enable still there axis cannot drop as it is in posisiton control. But the moving command is zero so you can apply brake.

BTW, before test, please test if you brake still good, I don't know if you already damage it.

Another attention--if you have multi-moving blocks, you need program by yourself when you need to apply brake.

Actually I don't use so much brake in CNC machines. even vertical axis. when machine running all axis will be held by position control. I use brake when use E-Stop, and same axis not moving so often.

Welcome your idea          

kylu_dziura

Hello

I have another problem, with control holding brake.

When I take off controller enable signal the axis sag (move down).

My settings:

Activate brake control    1        immed.

Brake release time    100    ms    immed.

Speed, close holding brake    50    rpm
immed.
Brake delay time    50    ms    immed.

Controller disable time    1400    ms    immed.

But the axis still moving down.

Do you know, that is some special function activation or something ?

I readed all documentation and nothing.

Thanks

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Split from Simodrive 611U 2 axes Profibus DP.

 Let us discuss E-Stop, I see a lot of control systems , not only CNC or closed loop control drive system, but also normal production lines. Most of them use simple E-Stop idea (Not only from system suppliers idea, but also from project makers) people all like to use simple,--

That is when E-Stop, the design to cut off main power (for motor, for Drive, and most of them cut off controller enables)

But I have been trained and learned from Siemens in starting from 1989. Siemens ideas in CNC and drive system--when E-Stop system designer should give command to let all axis and spindle (drive and motor) braking down with fastest possible currents. 

How can you fulfill this--you should not cut off main power (including drive power ) you should not cut off "control enable"--Just give in Siemens CNC E-Stop interface signal--, when all axis stopped then PLC program will cut off brake power --then brake will hold.

I don't remember in 611U system there is signal like in Siemens CNC --called E-stop, if Not, PLC programmer need design by himself. I think just make set point suddenly to zero but keep control enable.

kylu_dziura

This problem is only in emergency stop or switch off machine - cause power loos.

In normal operation this control bits are laways on and brake coil is on.

But in this emergency cases I have problem with falling down axis.