[CATCH22]

They weren't installed yet in that picture. The original 801 board is gone, I used some small DIN rail mount relays I had kicking around. Similar to this one https://www.digikey.com/product-deta...082-ND/4755334

OK so what are the 3 Relays for, 1 is for the SSR and what are the other 2 doing.

[Jim Dawson]

1 is for the SSR, 1 for the E-stop, and 1 for the controller permissive. I like to isolate the controller from the world with relays, optical or electromechanical. In general no direct connection between power components and the controller outputs or inputs. Normally the only thing I direct connect to a controller is the encoder inputs and the analog servo control outputs, everything else is isolated.

The exact relays that I use depends on the application, but when I'm doing my own stuff, normally whatever I have on the shelf.

[CATCH22]

1 is for the SSR, 1 for the E-stop, and 1 for the controller permissive. I like to isolate the controller from the world with relays, optical or electromechanical. In general no direct connection between power components and the controller outputs or inputs. Normally the only thing I direct connect to a controller is the encoder inputs and the analog servo control outputs, everything else is isolated.

The exact relays that I use depends on the application, but when I'm doing my own stuff, normally whatever I have on the shelf.

OK thanks Jim.

[Jim Dawson]

Here is an updated drawing, this is the way my E-stop/servo power is actually wired, using 3 relays.

[CATCH22]

Here is an updated drawing, this is the way my E-stop/servo power is actually wired, using 3 relays.

OK so I just got back to the mill after dealing with family stuff, and I noticed that there are 2 wires coming out of the servo amp and 3 wires going to a bob and one wire has a little green and yellow band around it, just wondering what these wires are for power?

[Jim Dawson]

Anilam normally used Gray(-) and Orange(+) for the DC power to the servo amps. The Green with Yellow band should be earth ground. The other 2 wires may the servo amp command signal, or could be the enable.

A picture would be helpful.

[CATCH22]

Anilam normally used Gray(-) and Orange(+) for the DC power to the servo amps. The Green with Yellow band should be earth ground. The other 2 wires may the servo amp command signal, or could be the enable.

A picture would be helpful.

Here are a couple of pics. The second picture are the 2 wires coming out of the amp and the first picture are the 3 wires going into the board, just wondering if these wires go into the Mesa 7i77 board.

[Jim Dawson]

If your drives are Servo Dynamics then:

The Standard Signal Input (pin 2) and Signal Common (pin 4) would go to the command output of the Mesa board

The Tach Input (pin 3) and Tach Common (pin 4) should go to direct to the motor tach.

[CATCH22]

If your drives are Servo Dynamics then:

This pdf should have the correct pinouts for the drive. https://www.dropbox.com/s/hsru5wh4m9...rives.pdf?dl=0

The Standard Signal Input (pin 2) and Signal Common (pin 4) would go to the command output of the Mesa board

The Tach Input (pin 3) and Tach Common (pin 4) should go to direct to the motor tach.

My drives are EG&G I just took a picture of them and you were correct on the grey and orange wires being the power.

[Jim Dawson]

A quick Google search did not turn up a manual for that drive, but what I described above should be more or less correct, but you are going to have to confirm the actual pins used.

[CATCH22]

A quick Google search did not turn up a manual for that drive, but what I described above should be more or less correct, but you are going to have to confirm the actual pins used.

OK got it,should the earth ground be connected to the 7I77 board or the panel itself?

[Jim Dawson]

I would not expect that wire to go to the 7i77 board, most likely that cable goes to the motor. But confirm that is a ground wire for sure, and where it is connected on the other end.

[CATCH22]

I would not expect that wire to go to the 7i77 board, most likely that cable goes to the motor. But confirm that is a ground wire for sure, and where it is connected on the other end.

When I took the board off the panel, those wires were grounded to the screw hole.

[Jim Dawson]

OK, that helps, then I would ground them to a panel ground.

[CATCH22]

If your drives are Servo Dynamics then:

The Standard Signal Input (pin 2) and Signal Common (pin 4) would go to the command output of the Mesa board

The Tach Input (pin 3) and Tach Common (pin 4) should go to direct to the motor tach.

Hey Jim, can you tell me is the command output on the 7I77 the TB8 out?

[Jim Dawson]

Hey Jim, can you tell me is the command output on the 7I77 the TB8 out?

No, it's the TB5 connector. See page 9 in the manual.

[CATCH22]

No, it's the TB5 connector. See page 9 in the manual.

OK thanks.

[CATCH22]

No, it's the TB5 connector. See page 9 in the manual.

OK so there are 4 pins on each block, ENA- ENA+ GND AOUT, so the two wires should go to the ENA- and ENA+ and the GND and AOUT nothing goes into them, is that correct Jim?
Thanks Mike

[Jim Dawson]

ENA - and ENA+ are the enable pins, it might be possible to use these, but many times can be unused. The AOUT is the command signal, and the GND is the command common. These would be connected to the command input pins on the drive.

[CATCH22]

ENA - and ENA+ are the enable pins, it might be possible to use these, but many times can be unused. The AOUT is the command signal, and the GND is the command common. These would be connected to the command input pins on the drive.

OK thanks again Jim.