Installing a Variable Frequency Drive
- Thread starter 69spark
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boater bill
Senior Member
- Location
- Cape Coral, Fl.
A VFD can replace a starter and overloads.
Make sure you program the motor nameplate data for overcurrent protection. An across the line starter line allow for 3-times FLA for 1 minute to ramp the motor up to speed. VFD's will limit the max cuurent to 110% or 150% for 1 minute typically.
The information supplied with the VFD will have different schematics for controlling start, stop and other functions. The VFD can be set up for 2 wire or 3 wire start/stop as a default.
There are many other things to consider before replacing the starter such as application, ramp up/down acceleration, etc. I would get in touch with your local rep and have them help you spec the right drive to replace the starter in question.
hope this helps
Make sure you program the motor nameplate data for overcurrent protection. An across the line starter line allow for 3-times FLA for 1 minute to ramp the motor up to speed. VFD's will limit the max cuurent to 110% or 150% for 1 minute typically.
The information supplied with the VFD will have different schematics for controlling start, stop and other functions. The VFD can be set up for 2 wire or 3 wire start/stop as a default.
There are many other things to consider before replacing the starter such as application, ramp up/down acceleration, etc. I would get in touch with your local rep and have them help you spec the right drive to replace the starter in question.
hope this helps
cschmid
Senior Member
- Location
- Northern cold country
yes a VFD can replace a starter...Yes you can wire a start stop station to them...I would ask if you want more info please provide more info...
weressl
Esteemed Member
Just be careful Keemosabe.69spark said:
The motor has to be suitable for ASD(Adjustable Speed Drive), i.e. it has to have a higher insulation level than normal.
Your original cable might not work either. Cable length and type has to be investigated and matched to the ASD specifications. Make sure that the cable is separated from other low voltage signal wires otherwise you can unadvertently trigger some of those circuits.
Star/Stop wiring for the ASD normaly requires shielded wiring.
Minimum speed should be not less than 10% of full load speed if it is a variable torque drive so that adequate cooling is still provided by the fan. Constant torque loads may require that you install en external cooling fan.
These are just some of the pitfalls. IMHO all ASD applications should be engineered.
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