voltage regulator

Status
Not open for further replies.
T

tyba16

Member
I Have A Residential Customer Whose Elevator Keeps Burning Up Control Panels, Owner Had Engineer From Elevator Company Fly Out To Look At And He Claims That The Voltage Feeding The 30 Amp 240 Volt Elevator Circuit Is To High At 246 Volts And That It Needs To Be Reduced To 240volts. Did Not Specify How To Do This, I've Looked Online And Couldn't Find Any Voltage Regulators For 30 Amps And 240 Volts. Any Suggestions As To The Best Way To Do This Would Be Greatly Appreciated. I Did Check The Voltage At The Elevator Control Panel And It Was 246, Which Didn't Suprise Me Since It Is Normal For The Town That I Live . Thanks
 
Hmmm, I seem to recall doing some UL listing tests, and one requirement stipulates that electrical appliances and devices must be able to operate at the nominal voltage plus or minus 10%. Seems to be a problem they will see often with that elevator. Unless it was listed for 208V.
 
UL listing and voltage rating

UL listing and voltage rating

Does the elevator name plate specify 240V? and is it UL listed.

Listing requires the device to operate as designed at the nominal voltage
+ or - 10%. So 240V nominal is 216V to 266V. A 10% spike or dip isn't
so uncommon
 
tyba16 said:
Engineer From Elevator Company Fly Out To Look At And He Claims That The Voltage Feeding The 30 Amp 240 Volt Elevator Circuit Is To High At 246 Volts And That It Needs To Be Reduced To 240volts.
Click to expand...

I think that is a bunch of bull, 6 volts high on 240 is nothing to worry about. I would have a recording power quality meter installed for about a month to see exactly what is going on.

But the engineer knows best, ;) as the others have said you need a to install one or two buck boost transformers and make some some money doing it. When it does not change anything you can point to the engineer.

Is the elevator single or three phase and does it use a neutral or not?
 
We serve a customer at 4160 V, regulated at the transmission level. They called a few weeks ago wanted to discuss some "overvoltages". In the preliminaries, the plant engineer kept stressing the point that they have seen voltages reaching as high as 498 volts on their 480 volt equipment. A whole morning wasted because he did not understand percentages.

We go through this same thing every few years or so at this plant if they have a few personnel changes. The new guys like to come in and see if they can impress the bosses by discovering something that people have somehow missed for 30 years.

I guess he thought we would be impressed with him being 18 volts over nominal or getting close to 500 volts. I wonder what he would have thought if we would have told him we often go tens of thousands of volts over nominal and well over 500,000 volts? :roll:
 
I had a very similar situation, only it was while on generator, that the controls screwed up. Working with the manufacture I removed the controls from the standard input power and installed a 2.5 KVA true online (double conversion) ups. No more control issues.
 
brian john said:
I had a very similar situation, only it was while on generator, that the controls screwed up. Working with the manufacture I removed the controls from the standard input power and installed a 2.5 KVA true online (double conversion) ups. No more control issues.
Click to expand...

I have no doubt that worked but I am very surprised you did not first determine the reason you needed that on line UPS. :-?

I can not believe the reason this elevator board is frying has to do with just a 6 VAC over-voltage. :smile:
 
Bob in my case the generator frequency and voltage output was not with in specs of the elevator. I believe (know*) it was a sizing issue. The frequency was set and not adjustable with consistency in this small an engine. The Engine could handle the load, but the dips screwed the controls. I ws the 4th EC and 3rd power guy to look at thos problem. I decided to opt for the easy method, in lieu of reinventing the controls.

* Careful here I was working for the manufacture.
 
Status
Not open for further replies.
Top