FNG20 CNC E retrofit

[sarin]

We have a FNG20 CNC E in our workshop and now it has problem with its controller, TNC 310.

I purchased MASSO to replace TNC 310, but we still have problems, due to lack of documentation from FNG20.

We try to control the axis with MASSO, but it can go and stop in one direction, when we command it to go another direction, it move without stop. We need to shut down the machine to stop.

All X, Y and Z axis of our FNG20, use Siemens 1FT5 Servmotor and the Analog feed module with standard interface.

 

[masso-support]

Do you have the model number of the servo drives?

 

[sarin]

The feed in Module is 6SN1146-1AB00-0BA1

The power Module is 6SN1123-1AB00-0HA1

The control Module is 6SN1118-0AE11-0AA1 (2 axis) and 6SN1118-0AD11-0AA1

Please see the attached pictures.

 

[masso-support]

sorry but couldn't find info if the drives can take STEP and DIRECTION signals, do you have someone who can confirm this.

 

[sarin]

It is very sad that you cannot the info on our drive. I try to ask manufacture about that and I hope they can help. Anyways, could you tell me about the protocol, how the MASSO STEP and DIRECTION signals work? How these signals tell the servo drives to move at specific speed to reach specific location?

As I told in previous post, we were successful to control the axis to move forward and reverse from MASSO Jog interface. However, we cannot change the speed and in one direction, the axis will move without stop.

 

[masso-support]

Can you please share how you wired it with MASSO and it might give us some clues on how to get it running with MASSO.

 

[sarin]

I attached the wiring diagram of servo drives with original controller TNC 310. As you can see, connection between control modules to TNC310 are only with Terminals 56 and 14 for each axis.

So for Masso, we connected Terminals 56 to S+ and 14 to D+ for each axis. The Power Supply - of the Masso was connected to machine ground (PE: connected to Terminal X131)

 

[sarin]

Sorry forgot to attach.

 

[masso-support]

So in the diagram where you connect terminals 56 and 14, whats the model number of the drive?

 

[sarin]

Sorry, I was out of town for several days. We connected terminal 56 and 14 of all axis motor drives. So the terminals are on 6SN1118-0AE11-0AA1 (2 axis) for X and Y axis (terminal 56.1 and 14.1 and 56.2 and 14.2) and for Z on 6SN1118-0AD11-0AA1 (terminals 56 and 14).

 

[sarin]

From documents I got from internet and the observation on the actual machine, the axis drive with 1FT5 motor, using position direct sensing analog control (please see attached picture). The axis drive module get only feedback of speed and direction from integrated encoder in the motor (1FT5) and the actual position feedback is sensed by linear encoder installed in each axis. With this kind of system how can we use MASSO?

 

[masso-support]

Yes we have seen this forum, and the reason for the delay has been that as its a 3rd part product it takes us a very long time to find information on the products as its not our own product, plus we need to first clear all pending support for our own products first because to support our own clients and then once we have time only then we are allowed to support 3rd part products.



Hope you can understand our problem as we cant support every manufacturer as they should support their own products. Will still try to have a look on this but as mentioned will have to clear our support list first, thanks for your understanding.

 

[masso-support]

we tried to go through some online documentation but the drive documentation is just way too long and needs hours and hours of reading and was not able to allocate that much time.

So as you mentioned earlier that you connected Pin 56 and 14, can you mark it in some diagrams and make it easy for us to find info, also where did you find info about these 56 and 14 pins, can you please share the link to the document you are referring too and the page number.

 

[sarin]

I snipped the pictures from Pdf files attached in post #1 and #8 and attached here. As you can see, the previous controller TNC310 was also wired to pins 56 and 14 of each axis drives (56.1 and 14.1 for X, 56.2 and 14.2 for Y on (A2) and 56 and 14 for Z and (A3)). From the document of the drive, pin 56 is Speed Setpoint (0 to +-10V) and pin 14 is the reference potential.

As shown is pictures in post #11, our drive modules get speed and position signal from controller through pin 56 and 14 and feedback of actual position (from linear encoder) is not back to the driver, but directly to controller.

 

[masso-support]

Thanks, so now where in the document we can find information about pins 56 and 14

 

[sarin]

Are you asking me question about where to find information about pins 56 and 14? I am not sure if you ask me, because in my previous post I did said that I sniped a part of PDF file attached in post #1 and in the attached picture, it does tell about pins 56 and 14.

Could you answer my questions in previous posts?

 

[masso-support]

Thanks for the info and that is what we were looking for, the drives take analog signals and that is why you could only run them in one direction. Basically if you will apply some voltage to the drive inputs then they will react to that voltage and depending on the direction of the current and voltage level the motor direction and speed will change. I am not sure if there drives can take digital signals because some drives can take both.

 

[sarin]

Could you tell or explain the digital signal protocol that MASSO uses for controlling the axis motor drivers?

As we tested last time, the axis can move and stop (we used step mode) in one direction but in reversed direction, the axis will move and not stop.

Thanks

 

[masso-support]

please see the below links on CNC STEP and DIR signal explanation:

• https://granitedevices.com/wiki/Pulse_and_direction
  
• http://www.cncroutersource.com/cnc-control.html
  

In a analog system the motor will move depending on the voltage applied, so even if you give the system some voltage the motor will run but the motor will not run the exact distance as commanded by the digital signals.

In your setup if you gave a motion command to run 10mm and then to run 30mm does the axis move the right distance?

 

[sarin]

I think you are right, our drives are analog. Now we are looking for the digital to analog converter to interface Masso and our drives.

Do you know a good and reliable device for that?