So I guess the Kanalog inputs for each axis encoders are more than with enough reserve , my servo motors are DC permanent magnet motors and their max RPM is 1200, maybe you can already recommend a know and optimal price/performance encoder for me to buy because there are so many to choose from it would ge good to have some advice.
PS. so the Kanalog input for 1 million counts/sec is basically a 1 Mhz input ?
In other words unless my motor rotor would spin at a million RPM it gives a high enough resolution for very precise control at low RPM right?
As for my drives yes I believe they are working ok, at zero volts differential input the rotor is stopped and also locked in position as I can't move it by hand not a single bit.
The hum I believe is from the mains frequency which is supplied to the motor rotor through it's comutator from the drive amplifier in order to hold it in place. My drive amplifiers (Indramat TRM3) use a thyristor output controlled by thyristor control IC's , I looked through the schematics as well as the drives themselves and it seems so , so basically it takes the three phase input and uses the positive and negative half periods to move the motor in either one or other direction and then chops off the period at the necessary place in order to have RPM control, as far as I understand there is no switching of high frequency involved in this amplifier.
So I understand that the electric brake is supposed to be released only when the machine is turned off in order to lock the tables and axis in place right ? so when working the only thing that stops and holds each axis is the motor itself?