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  • Convotherm settings for variable frequency drive

    Posted by coffeegeek on February 15, 2022 at 10:49 am

    Hello! The ATV12H075M2 variable frequency drive broke (shorted to ground), so we bought a new one. It was bought through an electronics distributor, not Convotherm. So it has just default settings. Anyone knows which settings this needs to operate properly? Addresses, etc.?

    As I understand it, it has MODBUS. Default address was 0 (which is broadcast). When I set it to 1, the oven passes the self-tests (no E03.0.1.1 anymore), and when I start the program it heats, but fan doesn’t turn. I also changed:

    COnF> FULL> drC > nPr [Rated motor power]: 0.35kW

    COnF> FULL> drC > nCr [Rated motor current]: 1.6A (nameplate says 1.6-1.65A), maybe 1.7A but not important at this point.

    Besides this, it is with default settings and I’m not sure which settings it needs.

    Any help is greatly appreciated.

    Mito147 replied 4 months ago 4 Members · 12 Replies
  • 12 Replies
  • fixbear

    Member
    February 15, 2022 at 12:57 pm

    Ussually something like that is in the programming parameters, ie; software on the memory chip..

  • coffeegeek

    Member
    February 15, 2022 at 1:38 pm

    Yes, but if someone has a service memo or something outlining the parameters, it would be great. I think when they replace this, they plug into the programming port. But maybe there is someone out there with the proper parameters?

  • ectofix

    Member
    February 15, 2022 at 6:07 pm

    Good luck with that, but since Convotherm sells the VFD already programmed, I doubt they provide the parameters for programming an off-the-shelf (or aftermarket) VFD in their service manuals. I could be wrong, though.

    We’ve never purchased an off-the-shelf VFD for the kitchen equipment we have which uses them (Hobart, Enviro-Pak, Werner and Pfleiderer, ) since they certainly don’t share their VFD’s parameters either. SO we must succumb to buying their much pricier ones.

    My only comparison to programming any sort of off-the-shelf controller was what’s called a “PID” (short for a proportional–integral–derivative controller). We bought off-the-shelf for our Wachtel deck oven. However, before buying it. I made sure our old, factory installed PID controller could power up at the bench so I could walk through its settings and write down its operating parameters for our specific application.

  • coffeegeek

    Member
    February 15, 2022 at 6:37 pm

    Oven is cooking again! 🙂 I made sure to buy an exact replacement (identical part number ATV12H075M2). I went through all the parameters, and finally it communicated. The replacement was about $170 while Convotherm was about $2k here. No reason to bleed an already ultra low margin industry (restaurants).

  • coffeegeek

    Member
    February 15, 2022 at 6:51 pm

    The trick was; go through the VFD of an identical oven and replicate the parameters on the off-the-shelf VFD 🙂

    And for those of you who work on a lot of ovens weekly, I would go through the VFD parameters of every oven model, and compile a parameters library. Then, when a VFD breaks, just buy it from Farnell, Mouser, etc. and look up your parameter library 🙂
    https://octopart.com/search?q=ATV12H075M2&currency=USD&specs=0

    Maybe not in the spirit of the leeches, but it would save you a bundle… 🙂

  • ectofix

    Member
    February 15, 2022 at 7:25 pm

    @coffeegeek WELP! You didn’t need any help then. Good job and thanks for sharing what you’d figured out.

  • coffeegeek

    Member
    February 15, 2022 at 7:34 pm

    I don’t know why I didn’t think of it in the first place.

    I see the original VFD was set to 0.40kW, but the motor is 0.35kW (on both ovens). Was it programmed wrong, or did they do it on purpose?

    Any insights on this?

  • ectofix

    Member
    February 16, 2022 at 8:05 pm

    I do not. Perhaps somebody else does.

    I’ve personally never attempted to program a VFD. I’ve seen YT vids on it, but never had to.

    Good-to-know info though. Thanks.

  • fixbear

    Member
    February 17, 2022 at 2:24 pm

    That’s only 2 amp difference. It may have to do with the start speed time from door opening and closing.

    What’s the power factor rating on the motor?

  • coffeegeek

    Member
    February 17, 2022 at 6:49 pm

    0.2 amps. (50W, I = P/U = 50w/250v = 0.2A).

    0.4kW is 15% over the 0.35kW motor. Not sure why they would do that. The VFD menus have own settings for ACC and DEC (acceleration and deceleration).

    I’m not with the motor and the oven is assembled again. I’ll take a look next time 🙂

    • fixbear

      Member
      February 18, 2022 at 9:19 am

      Guess I misplaced a decimal. I thought it was 500 watts and 230V.

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