6 3phase motor speed inverter help

[janosandi]

Hello guys
in a machine i have 6 inverters with speed control so i need to adjust each one seperately but finally i need to control the whole speed of the machine
i mean how i can adjust the 6 potentometers with one after setting the 6 ?

 

[KlausST]

Hi,

If you have six motors in a line driving the same load on a mechanically fixed system,
then usually one inverter acts as master. It's input as setpoint is "speed".
It needs an output proportional to "torque" ( or current)

All other inverters need to be setup as torque control, their input is the torque signal from the master.

You need inverters that are capable doing this.

Klaus

 

[janosandi]

thx Mr i thought tht its my first time i use inverters would u plz guide me on this?
im using 4 telemeqanique altivar 11 & 1 delta Vfd-m & 1 eura drive 1000
its an old inverters & i've just downloaded the manuals & set it
what i must look for this toque ?
i have 6 different speed motors which i set each one with 1 potentometer
so i can connect its reference voltage to the master inverter so i set each one seperately then control the machine speed with the master inverter potentometer ?

Thx Klaus

 

[KlausST]

Hi,

If you have six motors in a line driving the same load on a mechanically fixed system

do you have this configuration?

please give more mechanical details on your application.

Klaus

 

[janosandi]

Hello Klaus
Sorry i was little bit busy with something else & now im fully free for this inverter problem
my machine has 6 invereters controlling 6 mototrs but not the same load i think
its a machine of something like bakery
anyway i have 4 telemecanique alivar 11 & 1 eura drives 1000 & 1 delta Vfd
do u think i can use the external 10v option to control the 6 different inverters with extra potentiometer ?
& as i see i guess my inverters doesnt support this feature so i need to make some triks
any idea will b appriciated
Thx

 

[KlausST]

Hi,

the 6 motors control 6 independent belts ( and not one large belt).
if so, then forget about master and slave.

Maybe then it´s better to run the first belt with a controlable speed and the next one maybe 2% more...and the nxt one again 2% more...


if you want precice RPM then you must go for servo drive or other speed metering of each motor.

Klaus

 

[janosandi]

thx Klaus
no need for precise speed anyway i'll inform you with anything i do this few days

John

 

[janosandi]

Hello Klaus
Thx for ur attention
i've used an external 10v regulator with potentiometer & i've connected the output to the input of the 6 inverters & connected the 6 GND all together
my prblem was solved
so now when i set the master regulator to max i can set the 6 potentiometers to the max desired speed of the machine & then i can increase the whole machine speed with the master one