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Old Stamford Alternator C20 A is only giving 150v each phase to Neutral and 265 phase to phase...Anyone no how to change for 240/415v

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At first you should have nominal (rated) speed (1500 rpm or the written in your specification).
If you have it you should find your AVR (may be inside the alternator terminal box, or somewhere inside the alternator box), the voltage control trimmer and adjust to what you want the voltage to be. If not possible the AVR may be damaged.
The adjustment depends on your type of control system for the set as a whole.
If it is digital (computerized) the adjustment may also be digital.
If your system is too old it may have no AVR, but only transformed rectifier field supply. In this case you should check the transformer, choke (if any), rectifier and the condensers.

Posted on Jul 19, 2010


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Where can i obtain a wiring diagram

A one phase 3 wire system has a center tap. Two hots and a neutral. Typical 120/240 volts.
A three phase 4 wire system has Three hots in a Y or Delta. The Y system has three hots and the neutral comes from the center of the Y, this is the neutral and grounded conductor, 120 volts from hot to ground and 208 volts hot to hot. In a 3 phase system the voltage is not doubled hot to hot as in a single phase system because the hots are 120 degrees phased from each other and the square root of 3 is the factor, multiply the 120 volts by 1.73 to get 208 volts hot to hot. Multiply 208 by the reciprocal of 1.73 and get 120 volts. Your exact application is not given so it is not known. A delta system is a triangle and the angle of each triangle is a hot wire, one angle would be grounded or the center tap of one of the sides of the triangle. Y is the configuration of the windings of the alternator or transformer and Delta is the configuration as a triangle of the windings of the alternator or transformer where the power supply is.

With a three phase home service, you can only connect two hots from your single phase generator, and the neutral. One of the house's hot does not get connected and any three phase loads in the house should be switched off and kept from energyzing or a circuit breaker or fuse serving that 3 phase load may trip.
Only one power supply can be connected at a time. The power company power must not be connected at all while using an alternate power supply unless your power supply has means to synchronize the alternating cycle.

It is adviced that the loads be kept within 10% of their rated voltage, especially motors.

May 04, 2015 | Heating & Cooling

1 Answer

I have a Faema E91 3 group. I need to change it from 3 phase to single phase. any advise you can give

No, you will not have to change the elements, though the connexion cable will have to be approximately twice as thick. The three phases will, of course, deliver their power alternately, and the thinner neutral cable takes account of that. Do seek professional advice before connecting it to the mains supply.

Mar 21, 2015 | Faema Coffee Makers & Espresso Machines

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It requires two hot wires measuring 240 volts across them and 120 volts from either of them to the neutral connection. Some people refer to the two 'hots' as 'two-phase' and some refer to it as 'single-phase'. At any rate, you do NOT have three phase requirements with that dryer.

Most of the dryers have a 120volt motor which is why you need two hots and a neutral. To complicate matters, recent changes to the code now require 4 wires on newly constructed structures. Two hots, a neutral AND a bare ground wire.

Mar 05, 2015 | Whirlpool Dryers

1 Answer

Have a newage stamford alternator c20a kva 15.625 bolted to a deutz model f2l912 engine and have tried to pull the 2 components apart but can only get the 2 parts about 1 inch apart anybody got the an

from what you are describing the generator is a 15 kva unit bolted to the back of a deutz engine
check the end of the alternator armature for a bolt head. it is possible that there is a long bolt going through the centre of the armature shaft and holding the armature to the crankshaft on a taper
some older units used 4 rubber blocks in the drive from the crank shaft and there is a plate to retain them in place ( They were a safety device to protect the unit from damage if the mains power come back on while the generator was running. The out of phasing would stop the armature and rip the rubber blocks up)

Dec 30, 2014 | Cars & Trucks

1 Answer

How to check exciter and need to feed point the portion of avr

What alternator does your model have? Marathon? Stamford Newage? You can download a generic service manual for Stamford here, It is basically the same. If you found the manual useful please leave Facebook feedback

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How to conect three phase 5 wire conection to 4 wire 380volt three phase from the machine

Identify each of the 5 wires with voltage testing.
Find which breaker serves the 3-wire, and which breaker serves the 2-wire.
--You might have a 3-pole 3-phase breaker (with 3 hot wires) plus a single-pole breaker (with 1 hot and 1 neutral) ... giving a line with 4 hot wires and 1 neutral.
--Or you might have a 3-pole 3-phase breaker (with 3 hot wires) plus double-pole breaker (with 2 Hots) ... giving a line with 5 hot wires and no neutral.
The 4 wires from machine are probably 3 Hots and a neutral, or 3 Hots and a ground.

You need to identify where the ground wire is. One of the 5 wires from breaker box might be a ground.

Copy following links:


If you need further help, I’m available over the phone at

Sep 05, 2013 | Hardware & Accessories

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LP126HD3A rated for 265 volts AC single phase I have 240V ac single phase, how can I use this unit on 240V ac

You'd need to supply a "Buck-Boost" transformer to do this properly. Technically, the 265 VAC is one hot leg and neutral of a 480 VAC 3 Phase Y system that measures 277 VAC. The 265 number comes from this:

265 is the standard nameplate voltage for a 277 volt motor or AC unit.

230 is standard name plate for 240.
200 is standard name plate for 208
460 is standard name plate for 480.
110 is standard name plate for 120.

Most electricians call the hot leg / neutral circuit "277V AC".

Some popular "Buck-Boost" transformers will convert 208 to 240 and 240 to 208 volt systems, and 240 to 277 and 277 to 240 volt systems - among many other variations. These are auto-transformers as the primary secondary windings share a connection. KVA ratings differ significantly from name plate because of this fact. You should contact a qualified electrician to not only size, but wire the transformer for you. Failure to install a Buck-Boost transformer - and running this unit on 240V AC mains will cause premature failure of motors - fans and compressor due to overheating. This can also result in a fire hazard.

I hope this helps and good luck!

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I have a Stamford alternator model UCI247E I'm trying to restrap it from 220/380v to 120/208 can anyone help?

Look under Low Voltage (Parallel ) WYE Connection This is for a 12 lead alternator. I believe this is what you have. This will give you 120 / 208v 3 phase. Make sure that your connections are strong physically and well insulated electrically to prevent a nasty accident. This is a good, solid, dependable unit. Make sure that you have your frequency set around 61- 62 hz (depending on load) so that when the unit is loaded, the frequency drops to 60 hz. I have seen many units set to run quietly and save fuel. This being done, the rpm is too low and the output frequency is below 50hz. Anything with a coil (motors, transformers) will burn out due to an improper frequency.

Dec 05, 2010 | Electrical Supplies

2 Answers

I am Replacing a pump motor and I'm not sure of the connections

high speed phase neutral should go to High speed {phase} neutral low speed {phase} should go to neutral .....Low speed and high speed {phase} need not be connected

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