3 phase converter help needed please

Hi everyone,

I'm looking for some help we a 3 phase converter I've been given a while ago, and never used a 3 phase converter before I'm puzzled on how to set it up to run?

I have a small horizontal mill which was on single phase and decided to buy a new 1\2hp 3 phrase motor to go with converter (the motor company helped to make sure I had the correct motor for the converter) so I can better control the cutting speed, instead of having to mess around with the rats nest of pulleys every time I wish to change speeds.

My issue is i have no information/instructions on how to get the inverter to work or how to set the parameters? A electrician friend helped me with the wiring installation so that been done correctly.

Would any kind more knowledge person be able to help please, I'm fairly new to the forum but I've managed to put some pictures in a album

Many thanks in advance

George

Edited By George Jervis on 22/09/2018 11:50:39

What sort of phrases did you want to convert - (Tongue in cheek)
BobH

A quick google found the manual I didn't download it but it will probably have a "quick start" guide. The manufacturer will have a technical helpline that should give you assistance with parameter issues.

Martin.

George,

The first thing to do is check that the motor is wired for delta and not star. The VFD factory default settings should be good, as a starting point, to get running. Remote starting and stopping is usually a more advanced set up, as are individual trip settings for your particular circumstances.

Manual is available from Schneider

**LINK**

Not the most user friendly of manuals, but being a fairly old design there aren't many options to worry about. Unusually this device doesn't have run/stop buttons on the front, so switches of some kind will have to be wired.

Are the parameters locked even though the L2A parameter shown on page 56 is set to Yes?

Two of my inverters, I think, have one particular program setting number which locks, or unlocks, the programming - to avoid individuals, on the shop floor, tampering with the settings. I think that setting could only be accessed, on one VFD, after the it was left unpowered for some time. I can’t remember the Schneider manual as I didn’t really need it - that VFD had failed, probably due to old age.

p. 53 onwards of the manual covers parameters modification and gives some examples.

ItH should be set to nominal motor current (for thermal protection), take from motor plate.

bFr set to motor base frequency; 50 or 60 (almost certainly 50)

The setting method is very clunky, so read the examples carefully. ItH & bFr are both level 1 parameters.

You can define some preset speeds to call depending on switch positions. LSP, HSP, JOG, S3 S4.

All these are 'Level 1' parameters, so follow examples / flowchart for level 1.

Since you have a 0.37kW motor and a 0.37kW drive the factory default settings for motor should be reasonable - if in doubt you could perform a FCS (a level 2 parameter).

From your photos it looks like the drive is ready to go ( the RDY on the display). To give further assistance:

Can you photograph the wiring that you have going into the drive.

A photograph of a sketch of the wiring would also help.

Also a list of the parameters and what you have them set to would also help

Martin

As Martin has said above, we need a diagram of how the inverter is wired, especially the stop/start and speed inputs.

Reading the manual, it looks like these inputs are missing hence the 'no go' Page 47...

The front panel controls seem lacking in functionality...

Hi Martin,

I've put some more pictures in a album of the wiring to the motor and converter

The wiring I've used is 1.5mm2 sc 4 core

Converter wiring as follows

U is wire 3

V = 2

W=1

E tm earth

And the motor is wired too

U1 is wire 3

V1 is 2

W1 is wire 1

Earth is E

I'll try and write what the parameters I have on the converter at the moment but this might not be on here until later or tomorrow morning.

Many thanks again for the help

George

What about the control wiring ? Nothing will work without that.

Err...like what I said above....George you need some more string....and leave the inverter settings alone for the time being...concentrate on getting the motor to turn first..

This is were I could have gone wrong ? Does this mean I have to have a separate on off switch?

I had a few years ago a 3 phase converter on a large drill press that I just pressed the enter button for on or off and used the arrows up and down to increase or decrease the speed but I have sold that now. I had assumed that this 3 phase converter would be the same??

George

George,

Can you fit a short length of single core wire to connect LI1 and +24v together, then another wire to +10 and AI1 terminals? Then tull us what happens...Hopefully the motor runs at full speed..

George.

Don't do anything yet with regard to trying to start the motor. We need to know a bit more about how you have the motor wired. What you have shown so far is the power wiring, As John Rudd has pointed out the control side of the wiring is missing. What I'm not sure of just now is how you have connected the motor. Does the wiring run directly from the converter to the motor, or does it go through the original switchgear? Does the power supply to the converter go through the original switchgear or direct from the mains?

Martin