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5 Replies and 7482 Views
Just need to detect run state of 3phase motor 7482 5
Started by joe baird
I need to detect the run state (on/off) of a three phase motor with a microprocessor with pins rated at 3.3v max. I have a slight preference for a digital signal but an analog signal is fine if it is 0-3.3v with some threshold meaning on. What is the simplest and most economical (I need many of these) way to do this with a CR product - a split core device would be great but I can make do with a solid core. Thanks!
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by Tony Hodges 12/06/2010 2:27 PM |
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1 Replies and 5613 Views
Question about Vmax RMS 5613 1
Started by Eric Sandeen
I'm using a pair of CR8410-1000 CTs to monitor a circuit in a distribution panel, which will not exceed 15A (15A breakers) Therefore these 20A Ir CTs seemed to be the right choice. I wish to measure their output via an ADC which has an input range of 0-5V, and therefore I've biased the input by 2.5V. I notice, however, that the CR8410-1000 CTs have a Vmax of 2.1Vrms, and the datasheet suggests that the burden resistor should be chosen to limit V across it such that V < Vl <...
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by Tony Hodges09/27/2010 9:43 AM |
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1 Replies and 5581 Views
Burden Resister for CR2RL-500 5581 1
Started by Joe Wronski
After the fact, I realized that I bought the wrong transformer, a CR2RL-500, which is intended to drive a 0-5A ammeter. I had intended to use it with a 10 ohm burden resister, expecting to get 50V for a 50 A current. I have an 11.1 ohm burden resistor, and with a 60W light bulb load (confirmed with a plug in power meter), I get 100mV P-P. I calculate that to be 6 mA RMS through the 11.1 ohm burden, not the expected 50 mA. Is this the result of having too high burden resistance
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by Tony Hodges08/11/2010 4:31 PM |
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