Configuration 7i92m_7i76x1D

I have some servo drives where you have to install a jumper to "fake" the limit signal if no limits are to be connected to them.

Parameter P097=3 "Neglect inhibition of servo drive" - neglects all limit switches. More over, if it would not be neglected, then err 7 should be displayed, but not. Newer the less, I've connected DI3 and DI4, that corresponds to CCWL and CWL limits to ground (I didn't show it at scheme), meaning set to true, but nothing changed.

And I would definitely look into resetting the drives to their default parameter set

I will try that tommorow. I don't see any other ways anymore.

Are you sure you have the drives enable signals connected right?

Are you sure you have the drives enable signals connected right?

Yes, I'm sure. I see that input is true on interface screen.

I've resettled servo to default but nothing. I suspect that problem in interface of command pulses. May be this one doesn’t supports.
In EP1C manual there are few ways to connect signals to the servodrive.

Page 14

I use C3-1 differential drive, but may be I need to connect like in C3-2 - single end drive. If somebody know what 7i76 has inner scheme, tell me how to realize such connection.

The 7I76 has differential outputs and is very often used to drive servo drives with differential inputs
You can also drive single ended inputs with common GND or common 5V connections

It will not be problem if I will connect Step+ to step+ and Step- to Gnd? In the EP1C manual on page 14 says that I need to use resistor 85-120 Ohm. I tried this connection with resistor 100 Ohm but unsuccessful.

As long as you do not connect any of the 7I76 step/dir signals to ground (or 5V) that's OK

So for single ended with common anode Opto in drive:

7I76 step- to drive step-
7I76 +5 to drive step+
7I76 step+ and GND unconnected

and for single ended common cathode Opto in drive:

7I76 step+ to drive step+
7I76 GND to drive step-
7I76 step- and +5V unconnected

And lastly for differential:

7I76 step+ to drive step+
7I76 step- to drive step-

Hear I have differential input and it doesn't work.
Could be possible, that I somehow dameged inputs of step/dir signals? For example pluged off singal cable when servos was turned on? I don't remember that I do that, because I try to use them very gently, but for example.

Its very unlikely you have damaged the step/dir inputs unless you connected them to 24V or something like that
Since they are opto-isolated, even live connecting them should not be harmful

We also have one more servo drive EP3, of the same vendor but it’s older then those. I used same cable and same connection as for previouse drivers. And it works fine. I’ve concluded that it’s problem of all servo drives. I’ve opened it, it seems, that all step/dir signals comes to micro scheme P2160 1646 with 8 pins. I didn’t find datasheet for it. I’ve opened good one, it uses 074H 1516 txp also with 8 pins.
Then I’ve connected to my servo drives 24V encoder throughout resistors 1,5kOhm in single scheme and it worked fine. I see that I need to make some optocoupled PCB board to connect to MESA and use 24V simultaneously. It will solve my problem.
Thank you for your time, Peter, and for your message as Mesa tech specialist. You’ve helped me great.

I've finished my "5V to 24V" transmitter for 5 chanels and it works fine.
For step signal I use TLP250 - high freaquencu optocoupler and for Dir signal I use cheap and "slow" 4N27 transistor optocoupler.

I also have problems with only one X axis (port 0). It has big ripple. It's so big that I see that direction changes 7-10 times. I've also connected diode to MESA 7i76 output to check if problem in my pcb or MESA . Ripple goes from MESA side. It seems that problem in PID requlator. But parameters for X, Y and Z are same. I attach also Hal and ini files. Please look them. I think that problem in configuration files.