View Full Version : transformer volt/amp rating?

04-28-2004, 12:46 AM
I have this toroidal transformer and the label states:

primary 120v 2.04A 60Hz
secondary 2*24v 220va

does this mean I have 9.16 amps total or per 24v winding?
this came out of a dual servo drive rated at 10 amps each.

04-28-2004, 04:31 AM
120v x 2.04 A = 244.8 watt

244.8w / 24v = 10.2 A total

10.2 A / 2 = 5.1A each

However don't trust only my post, please wait someone else ;)

04-28-2004, 10:14 AM
The designation of this transformer are a bit strange. The VA rating should refer to the secondary winding's total capacity. The current rating listed is for the primary winding and shows maximum current.

For your secondary current you have:
220VA/(2*24V)=4.58A for each secondary.

Thia is the maximum current capability, but in practise you will get a lot of droop if you run full capacity all the time.