This is topic can you change 220v 3Phase strong highlight 11 to single Phase? in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.


To visit this topic, use this URL:
https://ft-forum.com/ft/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=1;t=011104

---

Posted by Peter Das (Member # 4690) on 12-07-2011, 11:46 AM:
 
I have a strong highlight 11 console fairly new with 220v 3Phase 60Hz, and I want to change to 220v (1)single phase 50-60hZ, Can you do this changing from inside tappings?or any other solutions to do this.
Thank you in advance.
 

---

Posted by Markus Ito (Member # 6207) on 12-07-2011, 01:25 PM:
 
It sounds like you want to run this console off of a 220 single phase line. I don't think it will be possible to reconfigure the existing power supply to use single phase. I have seen power supply transformers that allow you to move jumpers based on the voltage of your three phase (for example, 208), but converting to a single phase probably won't be possible with the current setup. You could try getting a phase converter which will convert the single phase into three phase, but these can be costly
 

---

Posted by Sam D. Chavez (Member # 1841) on 12-07-2011, 02:32 PM:
 
Is it one of the switching rectifiers?

If so, I believe they will run on single or 3 phase.
 

---

Posted by Monte L Fullmer (Member # 2797) on 12-07-2011, 02:58 PM:
 
If it is a switching rectifier, single phase connections for the incoming power would be on L-1 and L-3 in the terminal strip on the rectifier.

You use all three (L1,L2,L3) for three phase connections.

..and this is for the hard wired versions for the rectifier. If you have an "MS" connection for the rectifier, you'd have to go into schematics on how to connect for single phase.

Look in this warehouse page for the type of rectifier you have for that Highlight II to aid you along for the conversion.
 

---

Posted by Peter Das (Member # 4690) on 12-07-2011, 04:01 PM:
 
Here is the TYPE No :72006-02 SERIAL No :116409 MFR DATE 100604

Still I didnt buy this, if I can convert I am going to buy it. The present owner doesnt have any clue of this projector.
I appreciate all your guys help. THANK YOU
 

---

Posted by Jim Cassedy (Member # 4115) on 12-07-2011, 04:52 PM:
 
I'm not sure about running a whole console, but I know of
a couple of auditoriums here in San Francisco that are
running their 3phase xenon rectifiers (Christie)off of
a single phase supply by using a bank of large capacitors
to generate a third "phantom" phase. This trick can be
done, to some extent, with 3phase motors too, but becuase
it lowers the efficiency and the torque, I've only seen it
done with things like conveyor belt, blower or pump motors.

The rectifiers seem to work OK and have been using this
"trick" for over 10 years now. The only thing is that it
causes them to emit a loud buzz at about 120hz that I
find EXTREMELY annoying. So much so that I can't stand
to be in that booth for more than a few minutes when
the rectifiers are turned on or I get bad headaches.

If you poke around the 'net' a bit, you'll find that
there are several websites which give more details on
how to calculate the type & size capacitors you'd need
if you were going to attempt this. But again- I'm not
sure it would be practical or even possible to run a
whole console (rectifer, projector motor, automation,
etc) from a 'bastard' 3ph source like this.

Best thing would be a 'real' 3phase convertor, but
these can be quite expensive when you get into the
larger sizes.
 

---

Posted by Richard May (Member # 2627) on 12-07-2011, 06:15 PM:
 
Unless the Highlight II had a switcher put in after the original install, it probably has a 3 phase power supply. If that's the case, you can buy a switcher and wire it single phase like what was said here.
 

---

Posted by Monte L Fullmer (Member # 2797) on 12-07-2011, 07:49 PM:
 
More if I remember .. if the switcher has the "MS" plug on it, you prob can open up the case and remove the "MS" plus so you can convert it to hardwire .. in which you can still attach both hots to L-1 and L-3 and ground to chassis for single phase operation.

But, if it's a reactance (diode) rectifier, you're sorta confined to the 3 phase operation.

EDIT: did a search on the model number and nothing comes up from STRONG with that model number. of "72006-02". Would this brand of rectifier be from another company? Best do a more thorough research on this, report back to us before a final decision is made on your end.
 

---

Posted by Richard May (Member # 2627) on 12-07-2011, 08:14 PM:
 
That is actually the console model number.
 

---

Posted by Tony Bandiera Jr (Member # 2365) on 12-07-2011, 09:25 PM:
 
Monte, you are getting your input and output connections a bit confused.

The MS series switcher has the same twistlock AC mains input connector as the hardwire version does. It is a standard 30 amp 3 phase 4-wire style (I don't have the NEMA number handy at the moment) and as you mentioned, for single phase you simply use L1 and L3.

As for the output, I would recommend that if one doesn't want the MS connector, that they order the hardwire output board rather than trying to tie into the MS connector's leads. Other than the gazilion cover screws one has to remove for the swap, it is pretty straightforward. EDIT: Monte already said this part, oops.

Peter, you need to get the rectifier info from the owner, or have them take and send a picture of the rectifier to you to post here. Only then can we give you a positive answer.
 

---

Posted by Monte L Fullmer (Member # 2797) on 12-08-2011, 12:57 AM:
 

quote: Tony Bandiera Jr

---

getting your input and output connections a bit confused.

---

quote: Monte L Fullmer

---

... four prong

---

In the words of that wise person .... Hubba Hubba
 

---

Posted by Monte L Fullmer (Member # 2797) on 12-08-2011, 02:43 AM:
 

 

---

Posted by Louis Bornwasser (Member # 3063) on 12-08-2011, 07:58 PM:
 
Abracadabra!

Seriously, IF it is a switcher, it may actually be MORE efficient in single phase mode. I never trusted the Strong switchers (esp. since they are not normally field repairable) enough to have any personal knowledge.

Brute force three phase rectifiers don't work well on single phase. Louis
 

---

Posted by Peter Das (Member # 4690) on 12-09-2011, 05:08 AM:
 
Here is a picture of the powersupply label.


 

---

Posted by Sam D. Chavez (Member # 1841) on 12-09-2011, 10:20 AM:
 
You need three phase to run this high reactance supply.

Or, there are a lot of switcher power supplies for sale that will be the easiest way to dodge this problem.
 

---