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1 Replies and 1086 Views cr4395  1086  1 Started by  Bill Napier I would like to use multiple external current transformers all looping through the 4395. My question is this: if the relay is rated 1-10 amps, and multiple motors are running through multiple external current transformers add to more than 10 amps, how will this effect the 4395 Thanks.
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by  Tony HodgesJump to last post
05/22/2014 2:10 PM
3 Replies and 1074 Views CR4395 - Wound rotor motor plugging relay  1074  3 Started by  Sylvain Raymond We would like to use a CR4395 to limit plugging torque on a wound rotor motor. During plugging (commanding the opposing rotating direction) the output relay would drop on overcurent, preventing the secondary accelerating resistors from being shorted (and limiting the counter torque at the motor). The frequency at the rotor varies from very low frequency at nominal speed to 120Hz at start of plugging. Plugging inhibit is removed as the motor passes through zero speed and the rotor current freq...
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by  Tony HodgesJump to last post
05/12/2014 9:20 AM
1 Replies and 1511 Views Nuisance trip with CR4395  1511  1 Started by  jyothish rk Hi, We are facing problem using CR4395.The problem is with the tripping time. The part no of the current sensing relay that we are using is CR4395-LH-120-110-B-CD-ELR-I. The tripping time that we set is usually around 3 or 4 seconds, but due to motor inrush current the relay trips immediately.Our doubt now is, whether the tripping time dial, provided in the model is for setting the inhibit time or the delay for the relay to actuate in case of fault or is common for both. Or is it that, we ar...
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by  Tony HodgesJump to last post
10/29/2013 10:39 AM
1 Replies and 1350 Views Help choosing the right part  1350  1 Started by  raj aryan 1. I am using CR8348-2500-N 2. My input current is 0.1A to 2A typical. 3. I would like to get DC voltage out to my microprocessor. Preferably 0.1V for 0.1A. can i get better range 4. Can you recommend a ckt to get the above. 5. What should my burden resistor be
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by  Will LowesJump to last post
10/02/2013 2:16 PM
1 Replies and 1335 Views Help in choosing current switch  1335  1 Started by  Mark Prairie I have attached a diagram showing the application of a Magnacraft brand of current sensing relay. This circuit is intended to control an electric pump with the operation initiated by the momentary push button with the motor current maintianing operation until the current drops due to lack of water for the pump. Motor data: Full load current 9.9 amps, No load (no water) current 1.8 amps. Start current 37 amps. The Magnicraft uses a shunt for sensing and is prone to failure. What product ...
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by  Tony HodgesJump to last post
08/29/2013 10:17 AM
3 Replies and 1080 Views Preventive Maintenance  1080  3 Started by  Johann Jiménez Please can you give me which is the appropriate preventive and predictive maintenance or the maintenance instructions appropiate for: - VOLTAGE TRANSDUCER CR MAGNETIC 4520-24 - VOLTAGE TRANSDUCER CR MAGNETIC 5320-50 Thank you.
3 1080
by  Tony HodgesJump to last post
08/23/2013 10:49 AM
1 Replies and 1060 Views Question on CR6260-500-5 Output Range  1060  1 Started by  Kalam Puckett We purchased the CR6260-500-5 to monitor the power of a 230V/3Ph motor with a power factor of 74. I'm trying to determine the range of the 4-20ma output of the transducer. I'm making the assumption that 4ma (zero) is wattage at 0vac/0amps and 20ma (span) is wattage at 500vac/5amps. Then I'm thinking that the power factor would be applied in our DCS. Am I on the right track or totally off Thank you in advance. Kalam Puckett Xcel Energy
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by  Tony HodgesJump to last post
08/23/2013 9:41 AM
5 Replies and 1249 Views current sensing relay  1249  5 Started by  Jon Beaumont Hello, I am trying to come up with a system that can sense current lose in heaters. I was thinking that a current sensing relay would be ideal...using the relay to turn on LED lights to inform operators of a heater lose and thereby possibly saving a run...this application would be on an autoclave, I'm just concerned that the heaters basically turn on and off to maintain temperature during process an that this would cause false alarms, also the autoclaves themselves do not run 24hrs a day...how w...
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by  Tony HodgesJump to last post
08/15/2013 10:54 AM
1 Replies and 1058 Views CR6240-500-50 question  1058  1 Started by  Tim Yau Hi, I'm trying to add a CR6240-500-50 inside an Allen Bradley MCC bucket. Due to space constraint, the transducer is mounted after the overload relay. Should I feed pin 1, 2, and 3 of the transducer with 3-phase 480VAC after the overload relay (see Option1) or after the circuit breaker (see Option2) My concern is if the starter is off, would the transducer still be generating the 4mA output I'm not sure if the transducer needs the 480VAC to generate its 4-20mA output or if it's sole...
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by  Tony HodgesJump to last post
08/06/2013 3:42 PM
1 Replies and 1094 Views CR9580 output conversion  1094  1 Started by  Eric Buchanan I can not find the factors to convert the output voltage into the measured current. Is it simply linear from 0 VDC = 0 AAC to 5 VDC = rated AAC Thanks.
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by  Tony HodgesJump to last post
07/23/2013 8:42 AM
1 Replies and 1182 Views Difference between CR8348-2000 and CR8349-1000  1182  1 Started by  Sunil Sawant I want to measure 30 Amp inrush (surge) current for 3 secs. I have shortlisted CR8349-1000 and CR8348-2000 for the purpose. Both CTs are rated at 50 Amp. As per datasheet (CR8300 Series.pdf); Vmax rms, Te (typ) and DC Resistance of both CTs is different for same rated current. 1. What is the difference between both CTs from application point of view 2. Which CT is suitable for above mentioned application 3. Are both CTs interchangable in above mentioned ...
1 1182
by  Tony HodgesJump to last post
06/13/2013 8:33 AM
2 Replies and 1210 Views Monitor AC motor Currents on Conveyor  1210  2 Started by  Larry Laster I would like to know the best product available. What we are trying to do is monitor current on a conveyor that has a history of breakage. The idea is to monitor the current of the AC motor into the PLC analog card(0-10)vdc and then stop the conveyor before major damage. The motor is 460 3 phase 15 horsepower 17.22 amps. When starting the conveyor the current rises to 80 amps and once the conveyor is moving the current draw is around 6 amps. We are looking at your model CR4211. Does this require...
2 1210
by  Larry LasterJump to last post
06/07/2013 8:44 AM
4 Replies and 1085 Views CR4395 with CRGFS-100 Application Question  1085  4 Started by  Tim Mik Is there a limit to wire length from a CR4395 Module to the CRGFS-100 Also should shielded cable be used for interconnection Thanks, Tim
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by  Tim MikJump to last post
06/06/2013 8:52 AM
1 Replies and 1196 Views 3 phase 3 wire CT instal  1196  1 Started by  Art Goodman I'm using the CR8350-2500-N current transformer to measeure 3 phase 3 wire system. I need to know the correct install for your CT. When H1 faces the source on L1 and L3, I get a Negative Active Power reading. When L1(H1) faces the source and L3(H1) faces the load my Active Power is Positive. Which way is the correct install.
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by  Tony HodgesJump to last post
05/28/2013 8:27 AM
1 Replies and 1270 Views CT Recommendation  1270  1 Started by  Joe Rocci I have an application that requires current monitoring of a 220VAC load up 100 amps. I'd like to use a split-core CT. The output of the CT would drive a load resistor to develop a voltage that is sampled by an A-D converter in order to make various measurements. I'm looking at the 604-1000T for this. Since this is a 3000 turn unit, can I assume that, with 100 amps in the load, the output current would be 0.033A Can I also assume that, if I load it with 1000 ohms, the output voltage would be 33V...
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by  Will LowesJump to last post
05/07/2013 11:21 AM
1 Replies and 1231 Views amy 5395 with High and Low limit?  1231  1 Started by  Ron Fial Is there any version of the 5395 or similar product to sense DC current where the output relay closes betweeen, say, 1A and 3 A, but relay is open below 1A and relay is open above 3A. It would need two adjustments instead of the single on on the 5395. Thanks
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by  Tony HodgesJump to last post
04/12/2013 7:54 AM
1 Replies and 1386 Views CR5210-5  1386  1 Started by  Steve Smith I have several CR5210-5 CT's I use in my EGSE Racks to monitor the main power supply current which I send to a 0-10V panel meter. I have a 28VDC power supply used to power all the front panel meters, I tapped off of this Supply to the input of a L7824CT Voltage Regulator to power the CR5210-5. I recently had to change a CT because it was outputting 10mV with no current flow, (the main pwr supply was unplugged). I now have another CT that is outputting 6mV with no current flow.I have several q...
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by  Tony HodgesJump to last post
03/01/2013 11:19 AM
1 Replies and 1551 Views CR8448-1000  1551  1 Started by  Armando Mora I bought a CR8448-1000, but the CR8400 series data sheet doesn´t list its parameters (Ir, Vmax RMS, Te, DCR and frequency). Could you tell me about them Thanks.
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by  Tony HodgesJump to last post
01/18/2013 11:16 AM
1 Replies and 1453 Views Effect of Multiple (in-line) transducers?  1453  1 Started by  Travis W For my application, I would like to measure single-phase and three-phase test objects in two different setups: A: Volts - Amps - Watts - Power Factor B: -- C: -- A: Volts - Amps - Watts B: Volts - Amps - Watts C: Volts - Amps - Watts How much effect, if any, would the extra transducer (or two) have on the other transducers in that 'leg' of the circuit or in comparison with the other two legs It appears that the transducers have sufficient input i...
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by  Tony HodgesJump to last post
12/18/2012 3:56 PM
1 Replies and 1452 Views 3-Phase vs 1-Phase Power Measurement  1452  1 Started by  Travis W I want to accurately measure single-phase and three-phase test objects. The test set may be connected to a single-phase or three-phase power source (depending on which test bay I'm in). The information for 6250/6260 says that all three inputs are needed. When I switch over to single-phase measurement (e.g. single-phase test object), will I need to switch over to a single-element transducer such as the 6220 (which measures with one element)
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by  Tony HodgesJump to last post
12/18/2012 1:39 PM
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