this is a f/u question on message posted by John.
I have GBN 100 3 phase charger ( SCR 100-24-1050T1) for Hyster electric forklift. I only have single phase 220 output. Is it possible to rewire so that I can that charger with my 220 outlet? otherwise I have to sell this electric forklift.
thanks

I have a GNB 3-phase charger Mod#GTCII18-865T1. Its used to charge a Raymond reach lift with a battery of a 850AH rating. My mains supply is a single phase 120/240 volt supply. After configuring the unit to operate at 240v I tried the unit with a single transformer. The output was 34v AC at 40Amps. I left it for its full 8 hour cycle, needless to say with no results. I tried your above recommendation. I didn't check the voltage as the current shot up to 100-110 amps and the battery started to make a sizzling sound as well as the charger also sounded loud. Any suggestions or this charger strictly 3-phase

If the 3 phase charger has 3 identical transformers you wire each tranformer individually to single phase. You take the 2 feed wires going into each transformer and connect them to the 2 legs of the single phase. Each transformer is done this way. You set the contactor up with 2 legs comming in and the 2 legs coming out will be going to each transformer. You must adjust the transformer voltage taps to the proper voltage of the single phase. And you must make sure the control transformer for the on/off relay is set to the proper voltage also. If the charger doesn't have 3 identical transformers then I don't think it can be done.

i have one unit of 3 phase 200v charger for toyota forklift, i wish to change it to single phase, my country using 220v, so may i know how to do it? any diagram??

Thanks for your input, anyway
I have a vague idea. I think have to do a deeper analysis on the matter.

roldann,
I cannot explain exact how it is accomplished but I am a good listener & all the battery/charger people I have dealt with in 41 years advised me it is possible. They showed me how they did it (but I left the doing it to the experts - I was just a sales type guy & interested in inventory flexibility to met customers needs) I am ASSUMING the wires they moved around by-passed two of the transformers & I think a power fuse need to be changed..

We sold (used lifts & rented lots of electric units & the customers would have single phase input but we only had 3 phase chargers - the "experts" got their hands in side the cabinet and made it happen within minutes.
You might want to do a Google search or go talk to a local battery/charger service department.

Hi, Johnr j. I am not trying to be smart, just to my knowledge.
i m in the forklift service businnes and once in a wile repair battery chargers -no much problem- I have not beeing in the neccesity of changing from 3 phase to 1 phase.yet. But if i were, it 'll be good to have an idea. just in case.
how can i change from 3 to 1 phase, using the 3 primary transformers? only 1 or 2?, usin the 3 full wave circuits?
the one charger i refere it is a 3 trtansformer 3 phase, each transformer having a secondary winding with central tap.
will appreciate your comment.
Regards

If your single phase charger has the amp capacity & proper voltage for the the R14., then it is OK on the R14. No real safety issue (unless the charger is hooked up incorrectly usually the only thing that happens is that "expensive" fuses blow.). The amp capacity of the charger should match the maximum amp/hr capacity of the R14 battery + or - 10% (no greater) - same goes for the E14. The battery should have a data plate or stamping indicating the batter amh/hr capacity at a 5 hr rate (in the US we use 6 hr rate)

The terms single or three phase charger is only referring the input voltage into the charger. A transformer inside the charger (or 3 transformers in case of a three phase charger) converts the AC current supply to to DC for battery charging. Even if the unit has AC controller (the forklift with AC controls has transformers that converts the DC power from the battery back to AC

Thanks for the advice. We did have the charger delivered with the truck, but it means that we will have to take the R14 out of action so that we can plumb in the 3 phase charger. If it was safe to use the single phase charger then that would mean we could use the R14 as a back up in case the E14 had to be put on charge.

I can get the charger infos for you if required.

No problem. The single phase or three phase charger simply determines what the in put voltage power source. A three phase charge can be rewired internally to work on single phase input voltage supply. But a single phase charger cannot work on a three phase. You would need to determine in either case what the input voltage is set at. The advantage of three phase charger is that they will draw less amps for charging.
It is best to have a battery/charger dealer set the charger up for you - you will need to provide them what the input voltage & phase is into your building. - if you DYI you can "smoke" the charger.