I've installed a VFD to run my mill of 110 single phase. Currently the motor is 1hp 220v 3phase. I'm only after basic operations such as speed control, forward, reverse, and braking. I'm fine with the VFD braking and don't need to use an external resistor.

I'm usually good with electrical, I did a lot electrical repairs as an automotive tech. I'm will to pay or trade for the help.

 

give us your VFD model, and clarify what your doing. You want to run what motor off of what supply?

 

so you are probably looking to use external potentiometer to set the speed and
use either start, stop buttons with selector switch for forward/reverse or
use of three buttons (forward, stop, reverse). to provide you with connection diagram and parameter settings we would at very least need to know exact part number of the drive. i am guessing it is the WJ200 series product:

http://www.hitachi-america.us/ice/i...e_speed_drives/wj200/?WT.ac=pro_smm_pro_wj200

 

i believe you'll need to derate the motor HP by half since you're only to be able to supply 110V 3 phase (half the rated voltage). Is there no way to access 220V single phase?

 

Sorry I thought I had included the VFD info.
Hitachi wj200 007mf ver 2.0 manual number NT3261X

The manuel isn't the best, they refer to chapters of which there are none, along with others items.

I can't find anything about derating in the book. In researching before I purchase the VFD, it was my under standing that the key pad provided speed control, along with direction change. Additional it would also provide braking when using stop function, if you required additional braking, an external resistor could be installed in the input circuits.

This VFD model will only function with 110 input voltage. I had originally purchased a phase converter and was going to install 220v. After reading about the VFD, there was to less performance loss and it would give me speed control without changing belt positions since I have an older step pulley model Bridgeport model.

 

While Hitachi manual's leave some to be desired, their customer support is first rate. The rep took me through each and every setting I needed and then had me go through the steps to confirm things worked as I wanted. There was no since of hurry on his part, it was all about making sure I was happy with the unit.

 

I googled your motor. I was very surprised when I saw specs claiming 110/120V input and 220/240V output. I have never seen a drive that steps voltage up above input level. I set into reading the manual, looking to see if it had an onboard transformer. What I found, the description of operation, sounded just like an ordinary drive:
(page 33 of 475)

The figure below shows how the variable-frequency drive employs an internal inverter. The drive first converts incoming AC power to DC through a rectifier bridge, creating an internal DC bus voltage. Then the inverter circuit converts the DC back to AC again to power the motor.

No mention of a transformer, neither does the figure depict one.

So I thought maybe it employs some kind of buck boost method, and found nothing promising about that. Here's what I did find:
page 91/475:

the inverter output voltage cannot exceed the inverter input voltage or that specified by the AVR voltage selection

page 103/475:

The automatic voltage regulation (AVR) feature keeps the inverter output waveform at
a relatively constant amplitude during power input fluctuations. This can be useful if
the installation is subject to input voltage fluctuations. However, the inverter cannot
boost its motor output to a voltage higher than the power input voltage. If you enable
this feature, be sure to select the proper voltage class setting for your motor.

I don't think you're going to get 3 phase 220V out of this thing. I think it's going to be 3 phase 110V, which is half of what your motor is made for. I think you'll have to derate it. I have no idea why they claim 220V output with 110V input.

 

i see no reason to resort to derating, 200-240VAC is quite common.

WJ200 is a standard drive with a very decent documentation. i don't see anything more in manuals from other manufacturers. even quick guide is rather suficient and easy to follow:
http://www.hitachi-america.us/supportingdocs/forbus/inverters/Support/NT3251X.pdf
but if this is not enough, there is a detailed manual as well.

if you know what you do, you can use front panel on the VFD to control it but i think it will be much more user friendly to bring out needed functions (start/stop, direction and speed). i prefer to keep this out of sight so that users don't inadvertently alter any drive parameters.

 

i see no reason to resort to derating, 200-240VAC is quite common.

I saw nowhere in the manual for OP's drive that it's ok to apply 200-240V to the input. I clearly states that the input is 100-120V, and the output is 200-240V. Later in the manual it contradicts this and says that it cannot output more than input.

WJ200 is a standard drive with a very decent documentation. i don't see anything more in manuals from other manufacturers. even quick guide is rather suficient and easy to follow:
http://www.hitachi-america.us/supportingdocs/forbus/inverters/Support/NT3251X.pdf

This manual does not address the M model, which is what OP has. Please see the manual in my previous link. His drive is specified for only 100-110V input.
M=Single-phase 100V class

 

thank you for following up, i did get wrong manual

 

thank you for following up, i did get wrong manual

now that you've seen the manual, do you have any ideas? I know you've been at this stuff a lot longer than me. Have you ever seen a drive spec'd like this? I haven't. Would you put 220V on the input? If you put 110 on the input, would you expect it to output 3ph 220V or 3ph 110V? If it output 3ph 110V, would you need to derate the motor?

 

no i would not put 220V on the input, i would follow the manufacturers recommendation and use 120V supply.

boosting voltage is not a problem (and even regulating if needed), there is plenty of drives that do that. Allen Bradley 22A-V4P5N104 is another 1HP drive with 120V single phase in and 230V 3-phase out. if you look at the nameplate you will notice that output current is significantly lower than input current.

here is related video using similar drive (comparable 1HP unit from Temco is CFW100040SAZ):
http://www.youtube.com/watch?v=SOxNjsuUrZA

 

boosting voltage is not a problem (and even regulating if needed), there is plenty of drives that do that. Allen Bradley 22A-V4P5N104 is another 1HP drive with 120V single phase in and 230V 3-phase out. if you look at the nameplate you will notice that output current is significantly lower than input current.

What about the sections of the manual I quoted in post #7, saying "the output voltage cannot be greater than the input voltage" and "the drive cannot boost voltage"?

I think that this drive is probably based on (a modified version of) the 240V model and so uses the same output hardware as the larger 240 drives, so they just kept the higher rating. In the same way the V8 and V6 versions of the same pickup truck might have the same transmission and therefore both rated for "400HP, 450FT*LBS torque" even though only one is actually capable of such.

Either that, or those sections of the manual stating "the output voltage cannot be greater than the input voltage" and "the drive cannot boost voltage" applied to the 240V input models, and Hitachi forgot to delete them when making the 120V model.

Or, there's something I still don't get.

 

page 91 talks about volts per herts presets. this allows characterizing drive for variable torque control, it does not set motor output voltage. note that these settigns can be cranked up to 800V. http://en.wikipedia.org/wiki/Variable-frequency_drive

page 103 describes AVR setup. Hitachi should be answering this one. i think it might just be poorly worded translation. they probably wanted to say that drive can attempt to regulate output voltage to selected preset (200/215/220/230/240V), provided that input voltage remains within spec (100-120V).