Analog Servo runs at maximum speed at start

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09 Feb 2021 22:21 - 09 Feb 2021 22:21 #198207 by aleksamc
I connect last servomotor to rotary axis A.
Servomotor is synchronouse motor with resolver feedback. Direct encoder pulse feedback goes into 7i77.
Feedback of servomotor with servodrive linked by resolver RLG-W, RLG-V, RLG-U and tachogenerator: TA-U, TA-V, TA-W.
Motor is uncontrolable. Even if I sett analog control input to 5V, it doesn't rotates. Motor makes only jerk and overcurrent fault lights up.

I checked feedback wires, they are OK and fit to datasheet.

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Power wires of the motor has UVW marks and they are connected propperly.

But servomotor still doesn't work, and I feel that problem in wire connectio.
Does anybody had experiance in such problem? Does it's possible to solve this?
I have osciloscope, can I somehow check this with it help?
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Last edit: 09 Feb 2021 22:21 by aleksamc.

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09 Feb 2021 22:50 #198212 by tommylight
Seems like wiring is not right, be it on the feedback side or motor side, did you try to change just two of the motor wires?

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09 Feb 2021 23:26 #198221 by aleksamc
I tried, but unsucsesfull.
I nead to change only 2 wires as in asynchronous motor to change direction?
I will try one more time tomorrow.

Yes, scientific poke method is always the fastest and most effective way to solve a problem.

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09 Feb 2021 23:56 #198224 by tommylight

I nead to change only 2 wires as in asynchronous motor to change direction?

Yes.
The following user(s) said Thank You: aleksamc

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10 Feb 2021 09:23 #198254 by aleksamc
Tommylight, you was almost right.
Such kind of servomotors (that uses resolver) needs that feedback UVW corresponds to motor UVM. And it doesn't matter what is marked on power windings, they could possibly be wrong.
So changing only 2 wires doesn't solve the problem. Power winding has 3 wires, so you have 6 combinations of them and only one of them will work.
So after searching right combination, I found on of them right.

I must say, it's very good that I do this in my correspondetly young years. Becаuse motor motor behaves very scary on some wire combinations . It's easy to get a heart attack when motor doesn't moving but when you patiantly manual move rotor it becomes very and very wild (Motor is 2 kW).
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10 Feb 2021 12:42 #198271 by aleksamc
Does 7i77 has PWM output for laser, I think I need no more than 100Hz?

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