1305 VFD drive

[Unregistered]

Can anyone explain to me the difference between two wire and three wire control in the 1305 vfd operations?

thanks

 

[rsdoran]

Its the same with any form of motor control
http://www.patchn.com/twowire.htm

2 wire means one device turns on/off the motor...toggle switch etc
3 wire implements separate start and stop buttons.

Chapter 2 page 17 shows 2 and 3 wire connections:
http://literature.rockwellautomation.com/idc/groups/literature/documents/um/1305-um002_-en-p.pdf

 

[mgvol]

2-wire VFD control typically means you are using maintained switches (i.e. Closed=run Open=stop or Closed=run fwd and or run rev Open=stop). 3-wire is more like a traditional hard-wired motor ckt with momentary start/stop pushbuttons.

 

[rsdoran]

To be more graphic this is an elementary 3 wire circuit, give it a few seconds, its animated.