Stepper motors (or driver) not responding to S7-1214

Good afternoon,

I am trying to connect and run stepper motor with S7-1214 DC/DC/DC.

When I run through commisioning mode, nothing happens - software runs in TIA Portal but not in reality. Stepper motor is enabled - i mean, i can not rotate its shaft, current runs through. Software is set in RUN mode on start in Tia. My specifications are:

- S7-1214 DC/DC/DC

- 17HE08-1004S  1.8deg step motor, 1A per phase, 3.6ohm per phase, 4mH, I power it up at 24V for high speeds

- M542T V4.0 driver - signal voltage set for 24V, resistors 2.3k ohm to reduce current (as in datasheet)

Step motor does not heat up, only a little bit. 

Thank you in advance!

Hello!

U must also connect the GND(Dir-,Step-) from the stepper driver to the M- on the PLC.

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Good afternoon,

I am trying to connect and run stepper motor with S7-1214 DC/DC/DC.

When I run through commisioning mode, nothing happens - software runs in TIA Portal but not in reality. Stepper motor is enabled - i mean, i can not rotate its shaft, current runs through. Software is set in RUN mode on start in Tia. My specifications are:

- S7-1214 DC/DC/DC

- 17HE08-1004S  1.8deg step motor, 1A per phase, 3.6ohm per phase, 4mH, I power it up at 24V for high speeds

- M542T V4.0 driver - signal voltage set for 24V, resistors 2.3k ohm to reduce current (as in datasheet)

Step motor does not heat up, only a little bit. 

Thank you in advance!

 Hello There.

Here are few observations which may help you,

1. M542T V4.0 diver is new version which no need to connect 2K resistors like the old drives. Which is mentioned in their docs Manual PDF on page 5 Article 7.

As from my experience the PUL and DIR pins of Stepper drive requires certain amount of milliamps below which they cannot work.

Also please make sure to connect the M of your PLC and Stepper Drive PUL-, DIR-.

No need to connect the GND(or M or -) of the Stepper power with the PLC M.

2. As per the document ENA+- is NC. So leaving it from connecting anywhere is ok.

3. It is obvious I know but just to make sure that the, you are using motion control motion control block. Make sure the outputs are not being used in anywhere else. Mostly the builtin DC outputs (total 8 DI) is available for this function.

4. Check the required amp rating for the Motor and set the dynamic current as using SW 1,2,3 as per the Doc.

5. Another issue might be the steps/rev setting. Try to set it from 200 to upper setting from SW 5,6,7,8. Sometimes Higher frequency setting does not work at all. You will find it soon that there is a sweet spot of Frequency.

6. I am sure you did it, recheck if the Stepper cable paired correctly. You can do it by measuring the resistance and confirm if it is 3.6 Ohm.

If these setting does not work, then I suggest you replace the Stepper Driver.

Best of Luck.