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  1. PLCs, VFDs, Motors and Controls
    Hey everyone. I have a question and I know the answer is most likely something simple but y damn brain is just not clicking today. We have a 480v 3 phase 80Gal compressor I assume that the internal contactor would utilize a leg of 277v to pull in the motor starter coming from the pressure switch...
  2. Industrial Electrical Forum
    Hello, I Have a Street Brand 40 Ton overhead crane(2 hoists @ 20T each). The main contactor just starting chattering this morning but only when i use both hoists at the same time going up and down. Input voltage to the coil remains at 120V while chattering and if you manually hold in the...
  3. General Electrical Discussion
    Anyone know the secret to getting the coil to separate from the contact portion? There is an obvious clip on the bottom that does most of the work but something else is keeping it together. I want to see if I can use the 24VDC coil for another purpose. This came from Automation Direct but...
  4. General Electrical Discussion
    I am working on an electric steam kettle. The element is a 6 wire element (three loops) that is 24kW three-phase 220v. There are two contactors and a low water switch, t-stat, and tilt switch. The kettle was converted from 480v by switching out the element, removing a transformer, and adding one...
  5. NEC Code Forum
    Regarding relays and contactors, is there anything in the NEC that says the low power coil control and the high power, controlled, contacts must be on the same circuit? I searched my 2014 NEC.pdf for "relay" and "contactor" and found no such rule. Thanks
  6. General Electrical Discussion
    Hello all, I have a small commercial job I am finishing, (my first restaurant), and I would like some advice about the fire suppression system. Here is what I have: 2 exhaust fans & a MUA unit, all powered via contactors (motor starters). Simplex G. is doing the under the hood fire system...
  7. PLCs, VFDs, Motors and Controls
    I am trying to control one motor operated damper from two separate exhaust fans on two separate circuits. These dampers need to operate so that they actuate when either or both fans are running. How can I do this. The dampers are 120 volt.
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