Baldor DC Drive Series 20H

Found this....not much information to go by....

http://www.gain-control.com/Manuals/20H.pdf

Thank SolarEagle, JRaef

I have the manual but there is no information about this particular point

May be a possible solution be a new way of feedback, by tachometer o encoder if I cant not solve this issue

It would be useful for me to have circuital diagram or someone who has a similar problems

Anyway all help is welcome

Thanks rwilliams, you answer is very good

I follow the wiring back into the drive, I found the resistor divider, then un isolator amplifier A7800, then un TL082,then I lose the way of the feedback

Everything seem to work well but there is ahead a test point where is measured the armature voltage feedback and there are 0(zero) Volts when should be 2,5 Volts to 0 volts de armature voltage

It is dato of manual, on the test point is

0 Volt belong. Reverse 1000 voltios

2,5 volt belong. 0 voltios

5 Volts belong. forward 1000 Voltios

I have doubt with the A7800.

Thanks

CCIT

You could check the values of the resistors around the A7800, I have found more problems with passive components/solder connections than OP amps, for instance, but sometimes they do fail. Electrolytic capacitors if any nearby in the circuit do age out, may be affecting your circuit even if just on power supply connection.

Good luck,

Baldor is now owned by ABB. I’ve not had much luck getting them (ABB) to provide support for older Baldor products, but you might get lucky.

Finally me together with another electronic technician have replaced the A7800 and a Op Amp TL082 in the way of sample of armature voltage.

Then the equipment working well fortunately

Thank everyone, especially to rwilliams for his good advice