I feel like I'm in that movie "Christmas Vacation." I was thrown a project that is huge and already started. I would love some comments about the direction it's heading.
--64 light strands (700 watt 120vac incandecent) --600 amp feeder with 16 x 30 amp breakers allocated for above strands. --4 strands per breaker --each strand controlled on/off with 10 amp omron micro relay with a 2 times a second switching rate. --relays controlled by plc in predetermined pattern.
My biggest concern right now...is the switching speed and the inrush from the lamps as they are switched.
Any comments would be appreciated,
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If the inrush becomes a problem, have your programmer input a 20+ millisecond delay into selected rungs. It will be almost imperceptable to the eye. If you have a large number of rungs, the lights will "sweep" on and still look nice!
[This message has been edited by Pearlfish (edited 10-18-2002).]
Re: Huge amount of Christmas Lights#15457 10/18/0202:36 PM10/18/0202:36 PM
Could you add some more data so we can have a better understanding of everything?
Stuff like System type [1 phase, 3 phase], exact rating of each lamp [or lamps if various types], inrush level or cold Resistance level, flashing in sequence, randomly or all at once, overall length of circuits / feeders / subfeeds, available KVA, switching relay's duty rate and other specs, and do the lamps have to be at 100% intensity when on, or can they drop to 90% intensity.
Scott " 35 " Thompson Just Say NO To Green Eggs And Ham!