Feb 28, 2007 #1 jhanus Member level 2 Joined Feb 27, 2007 Messages 48 Helped 2 Reputation 4 Reaction score 2 Trophy points 1,288 Location Croatia Activity points 1,690 Hello, I found a transformer with cutoff wires, I want to use it , but primary coil has 3 leads: red, blue and brown. So which pair to connect to 220V? Resistance between are as on picture. Why are there 3 leads, none is connected to the iron core. Thanks.
Hello, I found a transformer with cutoff wires, I want to use it , but primary coil has 3 leads: red, blue and brown. So which pair to connect to 220V? Resistance between are as on picture. Why are there 3 leads, none is connected to the iron core. Thanks.
Feb 28, 2007 #2 D dkace Full Member level 6 Joined Jun 13, 2002 Messages 395 Helped 32 Reputation 64 Reaction score 7 Trophy points 1,298 Location Greece Activity points 3,562 Re: Transformer question maybe the third one is for tapping. How big the transformer is? Try putting voltages starting from 24V upwards to see the outcome. Where was this Tr before implemented? There is no indication what so ever ? Can you upload a photo or something? D.
Re: Transformer question maybe the third one is for tapping. How big the transformer is? Try putting voltages starting from 24V upwards to see the outcome. Where was this Tr before implemented? There is no indication what so ever ? Can you upload a photo or something? D.
Feb 28, 2007 #3 E-design Advanced Member level 5 Joined Jun 1, 2002 Messages 2,014 Helped 507 Reputation 1,016 Reaction score 408 Trophy points 1,363 Activity points 14,193 Re: Transformer question It looks like the transformer has a 240V with a tap for the 220V winding as well: Blue - Brown (220V) Blue - Red (240V)
Re: Transformer question It looks like the transformer has a 240V with a tap for the 220V winding as well: Blue - Brown (220V) Blue - Red (240V)
Feb 28, 2007 #4 jhanus Member level 2 Joined Feb 27, 2007 Messages 48 Helped 2 Reputation 4 Reaction score 2 Trophy points 1,288 Location Croatia Activity points 1,690 Re: Transformer question Thanks, Transformer was implemented in some old radio or tv. Why should 220-240V make difference, when our 220 V output can oscillate from 210 to 230V. Picture: https://obrazki.elektroda.pl/52_1172675883.JPG
Re: Transformer question Thanks, Transformer was implemented in some old radio or tv. Why should 220-240V make difference, when our 220 V output can oscillate from 210 to 230V. Picture: https://obrazki.elektroda.pl/52_1172675883.JPG
Feb 28, 2007 #5 E-design Advanced Member level 5 Joined Jun 1, 2002 Messages 2,014 Helped 507 Reputation 1,016 Reaction score 408 Trophy points 1,363 Activity points 14,193 Re: Transformer question Manufacturers often provide this 240V winding to accomodate countries that use 240V mains.
Re: Transformer question Manufacturers often provide this 240V winding to accomodate countries that use 240V mains.
Feb 28, 2007 #6 D dkace Full Member level 6 Joined Jun 13, 2002 Messages 395 Helped 32 Reputation 64 Reaction score 7 Trophy points 1,298 Location Greece Activity points 3,562 Re: Transformer question It is either 220 to 24 or 220 to 9V just check it by applying a voltage of 220V and measure the output. I don't know anything about the tap so i second what E-design is saying . But just to be sure, just run a measurement. D.
Re: Transformer question It is either 220 to 24 or 220 to 9V just check it by applying a voltage of 220V and measure the output. I don't know anything about the tap so i second what E-design is saying . But just to be sure, just run a measurement. D.
Feb 28, 2007 #7 jhanus Member level 2 Joined Feb 27, 2007 Messages 48 Helped 2 Reputation 4 Reaction score 2 Trophy points 1,288 Location Croatia Activity points 1,690 Re: Transformer question Haha, thank you all. You just saved me a fuse or a transformer!, because I wanted to connect red-brown. Just like E-design said: E-design said: It looks like the transformer has a 240V with a tap for the 220V winding as well: Blue - Brown (220V) Blue - Red (240V) Click to expand... -input 220V(Blue - Brown), output is 28V and (-18 )-0-18 But I don't know what is max. current or nominal, how to calculate that?!
Re: Transformer question Haha, thank you all. You just saved me a fuse or a transformer!, because I wanted to connect red-brown. Just like E-design said: E-design said: It looks like the transformer has a 240V with a tap for the 220V winding as well: Blue - Brown (220V) Blue - Red (240V) Click to expand... -input 220V(Blue - Brown), output is 28V and (-18 )-0-18 But I don't know what is max. current or nominal, how to calculate that?!
Feb 28, 2007 #8 E-design Advanced Member level 5 Joined Jun 1, 2002 Messages 2,014 Helped 507 Reputation 1,016 Reaction score 408 Trophy points 1,363 Activity points 14,193 Re: Transformer question By the looks of it I would think 35VA to 50VA max.
Feb 28, 2007 #9 D dkace Full Member level 6 Joined Jun 13, 2002 Messages 395 Helped 32 Reputation 64 Reaction score 7 Trophy points 1,298 Location Greece Activity points 3,562 Re: Transformer question I agree! normally these transformers output 35-50VA. What do you want to operate? D.
Re: Transformer question I agree! normally these transformers output 35-50VA. What do you want to operate? D.
Feb 28, 2007 #10 jhanus Member level 2 Joined Feb 27, 2007 Messages 48 Helped 2 Reputation 4 Reaction score 2 Trophy points 1,288 Location Croatia Activity points 1,690 Re: Transformer question I need power source like laboratory panel. So I would use it for variety things(motors, stepper, Op-Amp, uC, ...). When you say 35VA is this equal to output of: - 35V and 1A - 17.5V and 2A
Re: Transformer question I need power source like laboratory panel. So I would use it for variety things(motors, stepper, Op-Amp, uC, ...). When you say 35VA is this equal to output of: - 35V and 1A - 17.5V and 2A
Mar 1, 2007 #11 D dkace Full Member level 6 Joined Jun 13, 2002 Messages 395 Helped 32 Reputation 64 Reaction score 7 Trophy points 1,298 Location Greece Activity points 3,562 Re: Transformer question Try this link I think you will get a full answer... D.
Mar 1, 2007 #12 jhanus Member level 2 Joined Feb 27, 2007 Messages 48 Helped 2 Reputation 4 Reaction score 2 Trophy points 1,288 Location Croatia Activity points 1,690 Re: Transformer question Thanks for help.
Mar 2, 2007 #13 W wisepie Member level 4 Joined Aug 1, 2005 Messages 78 Helped 7 Reputation 14 Reaction score 0 Trophy points 1,286 Activity points 1,706 Re: Transformer question Another estimation can be made is to check the copper wire size. Normally current density of 3 ~ 5 A/mm2 will be applied.
Re: Transformer question Another estimation can be made is to check the copper wire size. Normally current density of 3 ~ 5 A/mm2 will be applied.