VFDs, Phases and voltage. OK, Now I am confused.

[Industrial Toys]

Well, I was fortunate enough to have my friend (and electrical expert) I call the Rocket Scientist drop in unexpectedly. He says the same thing. Just wire in 600 to two terminals. That's not really what tech support was saying.

But I still don't know why on the 220 volt version of the same MC series, I wired in 110/220. Maybe that wasn't right. But it worked.

Thanks.

 

[LD1]

Well, I was fortunate enough to have my friend (and electrical expert) I call the Rocket Scientist drop in unexpectedly. He says the same thing. Just wire in 600 to two terminals. That's not really what tech support was saying.

But I still don't know why on the 220 volt version of the same MC series, I wired in 110/220. Maybe that wasn't right. But it worked.

Thanks.

Not sure what you mean by "I wired in 110/220"

It's either or.

In a residential single phase, there are 3 wires. Two hhots and a neutral. If you used the two hots, you wired in 220....for a 220v output.

Same as wiring in two hot legs of 600v for your 600v drive

 

[buickanddeere]

What fourth input ? What transformer tap?
5,10,15 and 20KVA single phase transformers from 600V to 120/240 are as common as dirt on kijiji and sell for little more than scrap copper .
240 single phase into the transformer. 600 single phase out to two out of three of the input terminals of the VFD. Ground is connected to grounds.

 

[Industrial Toys]

The 220 was wired in with the neutral on one of the phase inputs, but I am guessing now that it was wrong as really it's a ground. Since it goes into the bridge rectifier, I guess it doesn't matter.

Sorry. I guess I begin to believe people calling transformer taps phases. Or split phase.

A typical 110/220 supply is just a single phase 220 transformer

 

[Industrial Toys]

The 220 was wired in with the neutral on one of the phase inputs, but I am guessing now that it was wrong as really it's a ground. Since it goes into the bridge rectifier, I guess it doesn't matter.

Sorry. I guess I begin to believe people calling transformer taps phases. Or split phase.

A typical 110/220 volt supply is just a single phase 220 volt transformer with a center tap that happens to be called a neutral and is grounded.

 

[Tractor Seabee]

It is interesting that you are talking 600 volt power. Here in the US; input/output transformer and motor input are rated at: 120/240 single phase, 120/208 three phase Y, 240/480 single phase and 3 phase Y, and 230/460 three phase Delta. Many transformers have mutti-taps to allow raising/lowering voltage output to match the applied voltage and final load. A lot of motors have multiple windins with the leads allm brought to a J box to select the input voltage available.

Also our codes here require 1,000 Kilo Volt rated wire for circuits over 480 volts. Due to the rating of the 1 KV wire distribution equipment and accessories gets real spendy and requires special training and licensing. A motor does not know the difference between the voltages except the lower 208 and 230 effect the heat output. I tried to make this simple as some of these esoteric things get garbled up a lot. LOL I am not real familiar with your application; my experience has primarily been with motor generator sets for voltage and phase generation. I used to work a lot with AC to DC and the reverse conversion before the days of solid state equipment. VFD s are still a mystery to me.

Ron

 

[buickanddeere]

Called Line 1, line 2 and neutral here on 120/240 single phase instead of legs. Legs seems to show up from those bizzare tapped delta transformers for 120/240 with wild legs etc.
Three phase is phase A, phase B , phase C and neutral if it's a wye system. Red, black blue and white is another term.

 

[LD1]

Called Line 1, line 2 and neutral here on 120/240 single phase instead of legs. Legs seems to show up from those bizzare tapped delta transformers for 120/240 with wild legs etc.
Three phase is phase A, phase B , phase C and neutral if it's a wye system. Red, black blue and white is another term.

Funny how things differ.

I have heard all kinds of terms, and dont really know if any is any more right or wrong than the other.

120/240, I have heard them called "legs" more often than not. But whenever writing it out or on a diagram, its always line 1 (or L1) and line 2 (L2). Never refered to as phases among people who know electricity.

No delta stuff aound here. Only 480 wye. And those are also refered to as "line" or "legs". On prints its L1, L2, L3.....or sometimes T1, T2, T3.

When using multiple wire colors, the common around here is either 3 blacks with coding tape....(or printed numbers on the wire), or brown orange and yellow wires. In that order too. Everything we wire gets ordered BOY as its easy to remember.

 

[CalG]

The 220 was wired in with the neutral on one of the phase inputs, but I am guessing now that it was wrong as really it's a ground. Since it goes into the bridge rectifier, I guess it doesn't matter.

Sorry. I guess I begin to believe people calling transformer taps phases. Or split phase.

A typical 110/220 volt supply is just a single phase 220 volt transformer with a center tap that happens to be called a neutral and is grounded.

I would not wire a VFD that way, not sure why, but a neutral on the input of a VFD is just not correct. Be sure to have a proper GROUNDING wire back to the box and attached to the VFD ground stud. The electronics will thank you.

 

[Tractor Seabee]

I will throw another piece of S**t in the game. You can always wire two transformers from a single phase primary source (phases A & B) into an open delta configuration (Phases A, B, and C w/no neutral) on the secondary side. Capacity drops to 87% of its rating due to the un-balanced circuitry. The Harmonics can cause line interference. This works good for motor loads realizing the capacity reduction. An alternate wiring scheme will provide a neutral for lighting loads on the secondary side Phases A and B only. Phase C becomes what is called the wild leg which is over 200 V to neutral. This is normally done when the 3 phase load is minor compared to the lighting load. This is the cheapest way to get 3 phase from single phase. A google search will get you all the info on these schemes.

This system was used often back when AC in homes started to become popular (1940 and 50s) and power Cos did not have 3 phase in those areas and did not want to spend the $. Sealed AC compressors over 2 HP were all 3 phase motors.

Ron