configuration of sinamics g120 with cu240s 1

[bvrml]

hi,

i have some questions concerning the configuation of a siemens g120 drive using starter-software.

1. The motor is build-in in a wagon to transport heavy loads. The wagon is guided by rails. If i will do an autotuning on the motor, it will turn. Now i dont know how many turns the motor does during the autotuning. I fear the wagon will drive off the rails at the end. Can i do an autotuning without the motor turning or define the number of rotations during autotuning? + how do i configure this in starter?

2. The drive will select a rotational speed using the bit selector and the digital inputs on the drive. When i tried this with my drive and other motor (that isnt build-in) i see the digital inputs changing in starter and selecting the correct speed. But the motor doesnt turn. Do i need to set another parameter to enable the selected speed with the digital input? (jogging works)

3. The motor has a failsafe brake system. How do i configure this as a 'emergency stop'?


Any help would be greatly appreciated!

Bvrml

 

[ozmosis]

Bvrml
1) I wouldn't expect too much movement during motor identification. Current flows into the motor and the measurement of the equivalent circuit is carried out but it doesn't start spinning the motor around. You will get some shaft movement but it depend how close your wagon is to the end of the rails.
You can undertake a manual Motor ID if you know all the motor equivalent circuit values but this is usually difficult to obtain accuratly.
2) It sounds like you are not selecting an ON command when selecting a fixed frequency. You will either need to configure a separate ON command via your digital inputs or connect via BICO an ON command. You could use the same digital input you are using for your FF as an ON command by 'connecting the bit' using the FF via P0840. It means you need to understand bico functionality. If you are not sure, ask someone from Siemens to commission. I would refrain from using advice I or others would give regarding actual parameter settings to configure this application-it sounds quite a safety critical one.
3) Is it a CU240S or CU240S PN/DP F? The latter means it includes the safety failsafe functions. If only a CU240S, then I would not look at all at doing any safety functions via the G120.
Regarding advice on safety failsafe functions, get specialist support. If you have to ask, then you shouldn't really be doing yourself.

 

[bvrml]

Hi Ozmosis,

Thank you for your helpfull reply.

1) Ok i get it, i also saw an option in the configuration wizard: motor identification on standstill. I guess that will do the trick too if i want to be sure?

2) I looked further into the ON/OFF option. So i guess i need to use an extra digital input and connect it to ON/OFF1? as some kind of enable?
Related to that: Can i use OFF3 to create an emergency stop? (see also 3))

3) It is indeed a CU240s PN <b>F</b>. So it can perform a failsafe stop. But actually there's a small metal box connected to the drive that seems to connect the brake coil of the motor. But i've never seen something like it before. Guess i won't need it.

Thanks for your help!

Bvrml

 

[ozmosis]

I suggest you read this:

http://support.automation.siemens.com/WW/view/en/31676845

especially pages 231. It explains how the CU240 PN F can be used for safe brake control.
OFF3 should not be used to create an Em.stop. Use the dedicated terminals for failsafe and the subsequent parameters for this function.
Also, understand what you, and the regulatory bodies, define as 'Safe'. There are plenty of standards around and depend on where you are in the world.
Regarding the use of an additional DIN for On/OFF. Yes you can but as you are wishing to use a failsafe function for stop, they will take priority over your OFF1 function if using a motor brake control to stop your carriage.

 

[bvrml]

Thank you, i guess i figured it out all now. Really helpfull PDF you directed me to. Way more extended than the manual i had.

Bvrml

 

[ozmosis]

You're welcome. That's what Eng-Tips is about.

Good luck