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1 Replies and 1592 Views Sense current with DC output  1592  1 Started by  Mark Carlile I've got a model 19 CT and need to get a DC output signal for monitoring a 2hp single phase AC motor. Using application guide titled 'Precision rectifier circuit for CT signal conditioning' has proven unsuccessful thus far. Details: 1) I'm assuming the two back to back zener diodes are to protect circuit from in-rush current when motor is starting. 2) Line amps will be between 5 and 15 amps. Using 10 amps with a 230 turn model 19 gives .04A. Applied to a 22ohm resistor should give ab...
1 1592
by  Tony HodgesJump to last post
09/26/2012 12:00 PM
1 Replies and 1536 Views Spice Models  1536  1 Started by  J Henzel Are there any spice models available for the CR3110-3000 current transformers Thanks JPH
1 1536
by  Tony HodgesJump to last post
09/10/2012 8:33 AM
1 Replies and 1540 Views CR5210 output options  1540  1 Started by  Darren Barnes Are there any custom options available for the CR5210/11 Specifically, I would like to use the output to operate a relay at full-scale voltage output. I don't want to wire to a discrete FET, then to a relay. Would prefer a ready-made module. Basically, I need a current switch that will kickout another circuit at 300 ADC. Thanks.
1 1540
by  Tony HodgesJump to last post
08/22/2012 10:06 AM
3 Replies and 1774 Views CR5300 Input Impedance  1774  3 Started by  Nathan Kingston I would like to know the input impedance of a few different versions of the CR5300. CR5310-5 CR5310-10 CR5310-50 Thanks.
3 1774
by  Tony HodgesJump to last post
06/21/2012 2:08 PM
1 Replies and 1689 Views CR5210-1  1689  1 Started by  Ed Smith Is the CR5210-1 bidirectional If the 0-5V output version is selected, what is the 0 current and full scale (both directions) output voltage
1 1689
by  Tony HodgesJump to last post
05/15/2012 10:56 AM
3 Replies and 2418 Views Sensing AC current  2418  3 Started by  Jim dePrado I am looking to build a way to automatically turn on the dust collector (220V 30A) in my woodworking shop when one of the other tools is turned on (110V/220V 15-30A). Would it be possible to hook up one/many of your current sensors to the hot leg of each tool's circuit and send that signal to a relay to turn on the dust collector Which products would you recommend Any help would be appreciated. Thanks, Jim
3 2418
by  kevin woodJump to last post
05/10/2012 12:30 AM
1 Replies and 1626 Views Transducer Mechanical Models  1626  1 Started by  Brent Hiller Greetings, I'm wondering if there are STEP models available for for your AC and DC transducers. Thanks.
1 1626
by  Tony HodgesJump to last post
05/09/2012 4:21 PM
2 Replies and 1755 Views Accuracy and time response CR4100 and CR2DARL-500  1755  2 Started by  Samuel Fonseca Soto We are setting up a power logging station and we would like to know if we would get better accuracy and better response time with a CR4470 than a metering current transformer CR2DARL-500 We are able to read 0-10 VDC or up to 5A signals. Any of the monitored equipment will be consuming more than 30A. Any orientation will be appreciated.
2 1755
by  Samuel Fonseca SotoJump to last post
04/18/2012 10:30 AM
1 Replies and 1749 Views CR4220-400  1749  1 Started by  Paul Rogers About 6 months ago we installed a CR4220-400 and the FLC of the motor it is on is 130A (checked with a handheld ampmeter) but the HMI display reads up to 424A. We have checked out the analog input card and it is ok and checked and double checked the ratio for the 4-20ma signal and it is ok. This CR4220 is on the motor side of a soft start instead of an across the line starter, we just wanted to know if this might be causing any problems before we replace the CR4220. Any advice Thanks
1 1749
by  Tony HodgesJump to last post
03/22/2012 10:30 AM
1 Replies and 1768 Views High Thermal Drift of CR5310-600  1768  1 Started by  Arseniy V We have a few CR5310-600 voltage transducers that are rated at 200ppm/C but we measured much higher thermal drift (we used calibrated oven, calibrated Fluke 8842A DMM, and calibrated powersupply). Here are a data points from our measurements (also attached as JPG file): Vin=608.41V Vout=5.0256V &91;54.1C&93; Vin=608.40V Vout=4.9974V &91;44.0C&93; Vin=607.14V Vout=4.7806V &91;33.5C&93; Vin=607.74V Vout=4.5974V &91;23.9C&93; Clearly you can see a significant ther...
1 1768
by  Tony HodgesJump to last post
02/23/2012 12:22 PM
1 Replies and 1802 Views Windings in CR8348-2500-N  1802  1 Started by  Wolf Homma I recently cut open a CR8348-2500-N. It appears that the windings are brought on in layers. From examining the design I concluded that there must be an 'upper' copper layer close to the hole on the CT. Naturally, this layer is closer to the bus bar going through the hole than the 'buried' layers underneath. From that it should follow that the CT is not a perfectly symmetrical component, if you consider the capacitance from the primary (high-voltage) bus bar to the 'upper' copper winding being hi...
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by  Tony HodgesJump to last post
02/16/2012 8:43 AM
1 Replies and 1819 Views Metering Class CTs  1819  1 Started by  Ed Lampe I see that the 50:5 CT's have a lower accuracy than the 100:5 CT's. Specifically the CR2DA series. Would I achieve higher accuracy by using a 100:5 and passing the metered wire through a second time thereby creating a 50:5 My max current will always be less than 50A. Thank You.
1 1819
by  Tony HodgesJump to last post
02/10/2012 11:34 AM
3 Replies and 1847 Views What to choose CR5411S-300 or CR5211S-300?  1847  3 Started by  johannes myhre I want to use CR5411S-300 for a battery testing setup (w. NI labView) Is this a good choice for automated measure of charging and discharging, 100ADC to -250ADC The input device (NI) has -10 10VDC diff. input. I read in your pdf info that CR5210/20S Series is 'ideal for battery charging applciations' But I don't think this will work good for my setup, with average DC value and simulated battery use (rapid changes charge/discharge) Please advice
3 1847
by  Tony HodgesJump to last post
02/03/2012 10:06 AM
1 Replies and 1837 Views Model 19 current transformer  1837  1 Started by  johannes myhre I have 10. model 19 transformers that I want to use with a standard IP67 LED http://no.farnell.com/cml-innovative-technologies/19010051/led-indicator-8mm-green-ip67/dp/1368960 Do I need some resistor or diode to get it to work I did not order the LED that is made for this, bacause I need it to be waterproof.
1 1837
by  Tony HodgesJump to last post
02/02/2012 11:50 AM
1 Replies and 1707 Views CR4110 supply voltage  1707  1 Started by  Pete Stoneberg We've got a bunch of CR products, like the 4110s, 4510's, and 6610's. I've got power supplies to give them 24v, but my Edaq can give 15v. The 24v power give a lot of noise on the freq and voltage transducers. I tried 'em at 15v Edaq power, andth esignal is much nicer. What are the problems running the transducers at lower supply voltage Thanks, Pete
1 1707
by  Tony HodgesJump to last post
02/02/2012 11:46 AM
1 Replies and 1898 Views LEM - HTFS 800-P - CURRENT TRANSDUCER  1898  1 Started by  michael golub I need something like this one: http://www.farnell.com/datasheets/65377.pdf got anything like it
1 1898
by  Tony HodgesJump to last post
01/23/2012 2:13 PM
1 Replies and 1852 Views 5210-5 Output Measures 24 V  1852  1 Started by  scott carden I have 24 V supplied to 3 5210-5 transducers. When I measure the output of the transducer I get 24V. Can you help Thanks in advance.
1 1852
by  Tony HodgesJump to last post
12/06/2011 10:00 AM
1 Replies and 1981 Views Phase angle error  1981  1 Started by  arun T Hello Sir, I am Arun studying Bachelor of Engineering in India. For my project i have to calculate phase angle error for a CT. How to calculate phase angle error in theoretically for resistive burden (Non inductive). Example : 1:500 Turns ratio, 10A/0.02A, Burden = 50 ohms, DCR = 27 ohms. For this example how to calculate phase angle error for this CT. Pls help with formula...Advance thanks for ur help.
1 1981
by  dave forsytheJump to last post
11/14/2011 9:27 AM
1 Replies and 1838 Views CR8348-2000 - Ks sensitivity Value  1838  1 Started by  Marcus Vinicius Zanon Castelo Branco Dears, I am using the CR8348-2000 Current Sensor and and i need the Sensitivity Value &91;V/A&93;parameter. This parameter is part of a formula that is shown at table 3, on page 19 in attached. Thank you. Marcus p.s. can i calculate it by the formula in attached 'formula.jpg'
1 1838
by  Tony HodgesJump to last post
11/10/2011 9:16 AM
3 Replies and 1854 Views Question on CR 5395 current relay  1854  3 Started by  Jeff McIntosh I am looking at this current relay in the DC version to be used in a circuit to sense the current going to a 1/8hp 90 VDC permenant magnet motor. The current will be 2 amps or less and need to energize a panel lamp when the motor is running along with a future interlock to shut the system doen on a motor interruption. Will the CR 5395 do this
3 1854
by  Tony HodgesJump to last post
11/02/2011 11:27 AM
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