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IndustryArena Forum > CNC Electronics > Dmm Technology > Need control cabinet help.
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  1. #1
    Join Date
    Nov 2005
    Posts
    222

    Need control cabinet help.

    I need some advice on the electrical protection, filter, and contactors. I just got my new DYN4 1.8K servo to use as a spindle motor so I am building a new control cabinet.

    Do I need a MCCB inside the cabinet? Or, will the breaker in my main panel less than 20 cable feet away be sufficient?

    I would also like to install a receptacle and allow my control box to be plugged in. Thoughts?

    For the DYN4 Drive and 1.8kw motor running on single phase 240v:

    1 x Eaton miniature circuit breaker, current-limiting, 20A, 480Y / 277 VAC / 96 VDC, 2-pole, D curve, thermal magnetic, 14kA SCCR, 35mm DIN rail mount.
    1 x Altech GMD-18-DC24V Contactor 3 Pole 18 Amp
    1 x SCHAFFNER FN2010-3-06 EMI POWER LINE FILTER, 3A, 740UA
    2 x Edison modular fuse holder, accepts Class CC fuses, 30A, 600V, 1-pole, 18-4 AWG copper only, integral pressure plate with separate spade connection, 35mm DIN rail mount.

    For the Unregulated Linear 625W/48VDC/13A Toroidal PSU (KL-4813) with 5VDC that powers the stepper drives (Gecko G203V) and motors. 240v input.

    1 x Eaton miniature circuit breaker, current-limiting, 15A, 480Y / 277 VAC / 96 VDC, 2-pole, D curve, thermal magnetic, 14kA SCCR, 35mm DIN rail mount.

    On page 22 of the DYN4 instructions it shows a 50 amp MCCB and 50 amp MC1. Why such high values? I saw that member Lt.Dan used lower values and those made sense to me. But then if I was really confident in what I am doing I wouldn't be asking questions.

    Thanks
    John

  2. #2
    Join Date
    Dec 2013
    Posts
    5716

    Re: Need control cabinet help.

    For the Dyne4, the reason they spec a 50 amp breaker on single phase is to handle the inrush current when the drive is energized. The inrush gets pretty high. A 20 Amp D curve might work. I am running four Dyne4s with 1.8KW motors and I have them coming off of a common 50 Amp breaker, and then to individual 30 Amp C curve breakers for each drive. I programatically energize the contactors one at a time with a 500ms delay between them. That way the combined inrush doesn't overload the system. I would go with a much higher rated contactor for the same reason, it sucks to weld the contacts. I'm using 32 Amp contactors on my 3 phase powered Dyne4s. I would use DMM Techs guidelines at a minimum on the contactors.

    I would concider this contactor https://www.automationdirect.com/adc.../SC-E2SG-24VDC or at a minimum one of these https://www.automationdirect.com/adc...AD-PR40-2A-24D

    I assume the fuse holders are for the 1 Amp control power fuses. Your spec is a bit overkill for that. Here is what I used, https://www.automationdirect.com/adc...ocks/KN-F10-10

    Your power supply hardware specs seem OK.
    Jim Dawson
    Sandy, Oregon, USA

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