559,624 active members*
3,605 visitors online*
Register for free
Login
IndustryArena Forum > MetalWorking Machines > Novakon > Sunfar C300 Brake Resistor
Results 1 to 5 of 5
  1. #1
    Gold Member
    Join Date
    Sep 2006
    Posts
    1738

    Sunfar C300 Brake Resistor

    Does anyone have the specs for the Braking Resistor?

    I have the Sunfar C300 VFD 1.5 KW.

    Is it a 400 watt power and 70 Ohm resistor or a 500 watt and 300 ohm resistor?

    I have waited far too long for this upgrade but being that I'm not swapping spindles or VFD's anytime soon, it's still important for me.

    Thank you.

  2. #2
    Gold Member
    Join Date
    Sep 2006
    Posts
    1738

    Re: Sunfar C300 Brake Resistor

    Found some old threads.

    Hirudin measured 76.6 Ohms and rated for 300 watts.

    SCzEngrgGroup had a 70 ohm, 260 watt unit that worked just fine.

    Our recommendation for power is 400 watts but looks like we have some wiggle room.

    Will be going with a 70 ohm, 300-400 watt unit.

  3. #3
    Gold Member
    Join Date
    Sep 2006
    Posts
    1738

    Re: Sunfar C300 Brake Resistor

    Wow. What have I been missing out on! Putting this brake on and adjusting my VFD F.10 & F.11 to 0.5 has changed my spindle! So impressed with the ramp up and braking speed.

    I'm still off on my VFD Max RPM though, controlled via Centroid Acorn. At a command of 6000, VFD reads 5500. At a command of 3000 VFD reads 2750 and at a command of 750, VFD is 600. Sunfar C300 F.8 setting was originally 200 but tested up to 400 with no avail.

    More to come, what an upgrade!

  4. #4
    Registered
    Join Date
    Jul 2011
    Posts
    386

    Re: Sunfar C300 Brake Resistor

    I think there is a lot of leeway in the wattage rating of the resistor. The rating given in the manual has to cover a lot of variables. For example the VFD may be connected to a conveyer belt (or a lathe that is turning a heavy work piece) that has a lot of inertia that has to be dissipated. A milling machine has vey little inertia by comparison. All you are slowing is the motor and whatever cutter and holder is in the spindle. Not much mass. The short time it takes for the motor to come to a complete stop is not really enough to put much heat into the resistor.

  5. #5
    Registered
    Join Date
    Jul 2011
    Posts
    386

    Re: Sunfar C300 Brake Resistor

    I had issues with the Sunfar VFD causing a lockup of the power draw bar due to electrical noise crashing the power drawbar. Under warranty and advisement from Novakon I replaced the Sunfar with a GS2 from automation direct. The automation direct VFD has been flawless. When helping recently with a cleanup I found a power resistor with a suitable resistance to use with my VFD. There were no ohm or wattage markings on the resistor. From comparison size wise I think it should be rated for about 200 watts. I'm going to give it a try.

    So you know the specs for the recommended resistor are in the Sunfar manual. I googled a copy of it and it was at the very end of the manual.

Similar Threads

  1. Servo drive brake resistor overheating
    By greenflight in forum Fanuc
    Replies: 0
    Last Post: 04-10-2019, 06:11 AM
  2. Ona Techno c300 erosion machine
    By jsync in forum Machinery Manuals / Brochures
    Replies: 0
    Last Post: 11-27-2015, 03:32 PM
  3. Ona Techno c300 errosjonsmaskin
    By jsync in forum Norwegian
    Replies: 0
    Last Post: 11-27-2015, 09:38 AM
  4. 600mm Box bend brake (Finger Brake, pan Brake)
    By RotarySMP in forum Bending, Forging, Extrusion...
    Replies: 35
    Last Post: 11-01-2015, 10:24 AM
  5. Power resistor on X2 as a brake
    By MrWild in forum Benchtop Machines
    Replies: 3
    Last Post: 02-25-2012, 08:36 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •