hi
I'm just trying to find a powerpoint presentation I did last year for an assignment I did at college which covered the basics
seem to have no college file
bear with me
right...cant find anything
had problem with my laptop last month and it seems to of all been wiped
ok will try my best to give you enough info from memory
but it is a huge subject
I may be wrong but I assume you mean VVVF drives/inverters (never heard of Jag drives sorry)
firstly they can be connected with single phase as well as three phase supplies (tend to be smaller motors with single phase supply) this is because the first thing the inverter does is convert the AC supply to DC using a rectifier bridge.
Missing out the boring part lol (which believe me is a good thing and I think is going a little far)........the output from the inverter varies in voltage as well as frequency hence the name (variable voltage variable frequency) to maintain the torque of the motor the ratio between the two remains constant.
The speed of an AC motor is dependant on frequency and number of poles so obviously the sole purpose of the drive is to supply the motor with varying frequencies at any time for example ramping up within a set time etc.
Configuring the drives is a huge subject and quite difficult to go into, it could be set up closed or open loop (for a simple example if driving a pump could be wired to a flowmeter and could ramp up as flow decreases etc)
Now before anyone says anything I know that I havent even touched on the subject but lets face it...how much are they expecting you to know? what are they gonna ask? I know for a fact that many on here know more than me (about everything) and Shakey for one will hopefully be along and help you properly
I'm gutted cus the PP presentation was really good and went into lots I have forgotten to write..if you want to know any particulars that I havent covered please ask
Craig