Recent content by Masbibe

I assume it is PT100 not PTC because temperature is measured continual (in degrees) not just as overtemperature signal like PTC do it. Milovan Milosevic

I don't have a nameplate photo. It's a normal DC motor somewhere about 5 MW. As Gunnar said this sliprings are only for temperature measurement. Temperature element is most probably PT100. I decided that I will most probably use some converter Hz (kHz) to 4...20 mA signal. I saw that Murr...

I just dont understand how frequency signal depent on resistance is "injected" to this 2 wires named as A and B. Milovan Milosevic

Hello roydm, But I must supply this trasmitter somehow. Also I would not like to install anything on rotor. Milovan Milosevic

Hello guys, Is anybody saw this kind of armature temperature measurement on DC motor (see attached photo). We should upgrade drive for this motor with new one, and hopefully we should keep temperature measurement. Anybody has idea what this resistance frequency converter is doing here ...

Yes you are right my mistake. I didn't draw it on paper. Milovan Milosevic

Strange answer. For me it should rotate opposite comparing to normal connection. Milovan Milosevic

If you connect load like davidbeach said yes it will be autotransformer. But as I understood original question was what will be with output voltage (two terminals bellow). My answer was in this direction that this bridge will not change anything with output voltage. Milovan Milosevic

This bridge between primary and secondary winding will not efect secondary voltage value. Secondary voltage will be Us = 460 * Ns / Np. Ns - number of turns on secondary winding Np - number of turns on primary winding Why connection like this is used I don't know. This is not typical...

Check one by one channel of encoder by using only one channel for feedback (via parameters setting). Attach drawings of this part, encoder type and parameters file. Milovan Milosevic

Skogsgurra, Thanks for response. Of course if you dont have field there is no braking. You can make some connection to archieve self excitation (connecting armature over some voltage divider to field) but efect of braking will not be so good because voltage on armature will drop with speed...

Drivesrock, Thanks for response. Partly you are right. High speed DC breaker is used during regeneration in case of network failure. But breaker or contactor on AC side will not help in this case because short circuit is formed in drive between plus and minus. This phenomana is called...

plangete, You can read ABB electrical installation handbook, part 2, protection of feeders: http://www02.abb.com/global/dkabb/dkabb501.nsf/0/8a84de769b6145bdc1257937003efe87/$file/H%C3%A5ndbog+-+elektriske+installationer+1SDC010002D0206.pdf Milovan Milosevic

electrolitic, 11.75 means 11h 45 minutes 0.25 means 12h 15 minutes 0.75 means 12h 45 minutes on phasor diagram representig as clock (12h is zero degree) Milovan Milosevic

iop95, Thanks for response. Dynamic breaking will be used very seldom. I am planing to control Q1 from drive so this mean that drive is switching-off Q1 after he disable both bridges (current fall to zero). Milovan Milosevic