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Thread: VFD for old 3-phase motors
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7th April 2020, 12:57 PM #1
SENIOR MEMBER
- Join Date
- Apr 2013
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- Brisbane
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- 623
VFD for old 3-phase motors
Hey, I have taken everyone's advice and am going down the VFD route for my old bandsaws mainly due to:
- Replacing with a single phase means I would likely need to buy a motor pulley to match the shaft size (19mm) that is common to 3HP single phase motors - so total cost would exceed roughly $220 - $240.
- A VFD will allow to retain original motor and therefore pulley
- A VFD will allow to set slow start-up of what ever I configure
Any other advantages you can think of?
When I scratched the surface with buying a VFD some time ago for my then 3-Phase Dyco Table Saw I was told I need very little information to configure the VFD example:
1. Motor Rated Voltage 415v 2. Motor Rated current (Amps/FLA/FLC) at given voltage to be wired FLC: 6.9A 3. Motor rated RPM ( Number of Poles) 2 Poles (2810 RPM) 4. Cycles (HZ) a.k.a. Frequency; 60HZ or 50HZ dependent upon design. 50Hz 5. Power – KW 2.2HP / 1.65KW
- The above said does anyone see any issues with this VFD from Conon: 2.2kw/3HP Three Phase Variable Frequency Drive compact Inverter VSD VFD ?
- They talk about hooking up two motors to the VFD a I understand it (https://cononmotor.com.au/wp-content...0-Brochure.pdf)
- Do both the motors need to be identical with identical stats and config?
Screen Shot 2020-02-26 at 7.00.44 pm (1).png
The motors are as below:
Motor HP Phase Volts AMPS RPM Cycles (Hz) RATING Crompton (Crescent Bandsaw) 2.75 3 400/440 5 940 50 CONT K. L. Electric Co. (McPherson Bandsaw) 3 3 415 4.3 1425 50 CONT Crompton (L.S. Barker Bandsaw) 5 3 400/440 7.4 1440 50 ?
20200407_112921_resized.jpg 20200407_112926_resized.jpg
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7th April 2020, 01:05 PM #2
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- Join Date
- Feb 2006
- Location
- Perth
- Posts
- 24,746
Go to the Electronics forum and read the VFD for newbies sticky and then ask questions from inside that forum,
VFDs for Newbies