help wiring inverter to car ramp

[Knobhead]

Just going on past experience have you got a pot or resistor connected to the speed reference? No resistance = no speed. Also where is the safety contactor fitted? If after the VFD it needs to be closed before the VFD is energised.

 

[justin221]

hi thanks for all you replies
all i want to do is make my 240v supply work my 3 phase motor as i think this inverter will do this job
i will get the full part number today of the scf
the motor has 2 voltage ops on it one is 380-420v Y
the other being 220-240v delta 2820 r/min 3-50hz
i asume this is what you mean if your asking if the motor is dual power thanks

thanks for all you help everyone i will let you know how it all goes tonight

 

[jpmiff]

Hi,
as you have said the motor is a dual voltage type, first, the motor needs to be wired for 220-240v delta. then you need to access the inverter program parameters to set the current limit and overload levels for the motor, this would protect the motor if any thing went a miss.
you will have to decide which stop start set up you need for your application, i personally would use two wire stop start using preset speeds,fwd and rev. i would use an accel time for starting(soft start) and coast to stop.
the strange voltage you are getting are down to the fact that the out put voltage of the inverter is DC pulsed to simulate AC.

 

[justin221]

hi guys i have wired the motor to each opposite terminal which being v2-w1 u2-v1
u1-w2 is this right or have i got to wire it to the terminals you said
also the inverter came in a prefab box which has on off sw and a dial for freq (but this is broken) and a reverse sw
at the moment all it is doing is buzzing wont spin thanks

 

[Knobhead]

See my last post, I asked if there was a pot on the speed reference. It’s usually 0 to 10K linier. I normally use a 10 turn wire wound. Read the rest of the post as well!
Motor connections
Delta
U1 > V2
V1 > W2
W1 > U2
Star
U1
V1
W1
U2,V2 & W2 bridged

 

[justin221]

so i need to put a link wire from u1 to v2
a wire from v1 to w2 and then w1 to u2 not just link to the opposit thanks

 

[silva.foxx]

Motor to be connected as:

You'll need to drill through the parameters ensuring motor base speed is 50Hz, motor voltage is correct, control is via terminal strip and speed is via potentiometer. Is this motor fitted to the ramp (ie. under load) or is it buzzing on the bench (ie. not under load)?

We're assuming your motor is new or is known to be in a fully operational condition or tested for electrical balance.

The manual is pretty decent and will be your biggest help. Any model number yet?

.

 

[Knobhead]

The manufactures usually offset the connections so you can fit links in a straight line to the opposite terminal.

Top row
U1 V1 W1
Bottom row
W2 U2 V2

 

[justin221]

hold on the other guy said to link it different whos right then

 

[justin221]

model is sf250yf-787
so i just wire strait across as pic shows

got it moving now it was down to the broken sw i just need to run it at 50 hz i assum
thanks for the help every one cheers

 

[justin221]

yes i have replaced it

 

[pmac10]

glad you got it going mate, reread posts 2 -8

 

[silva.foxx]

pmac10... quite rightly points out the answers were in the first 8 posts!!!

I think we're all in agreement that some trainees should leave the real jobs to the qualified sparks.

A little knowledge is effing dangerous to some!

 

[pmac10]

Mr Foxx, on the subject of wiring motors/inverters, i have adopted a new 'best practice' at the motor terminal box. connect the CPC first. why? two minor explosions in my face from connnecting the CPC last and knipping a phase wire with the contact plate of the CPC. two ?? you say? it was a brake motor and i thought i'd ****** up the brake wiring, so had to make sure, so yes two, lol, pass it on mate

 

[silva.foxx]

The most important wire! Always connect it first and make sure its the longest of the tails!