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measure motor current

Created by: Ton Verra at: 7/15/2013 9:43 AM (8 Replies)

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7/15/2013 9:43 AM	Rate (0)
Ton Verra Gold Member Joined: 4/20/2007 Last visit: 12/18/2025 Posts: 731 Rating: (43)	Hi, Not sure if this is the right corner of the forum to ask this, but I need a "plug-and-play" module to measure the current drawn by a couple of motors. I would like to be able to take out these currents as 4..20 mA signals. The motors are direct started and 12 kW and 3 kW at 690 VAC. The motors drive circulationpumps. I need to Keep It Simple Stupid (KISS).

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7/15/2013 10:02 AM	Rate (0)
Vithani Platinum Member Joined: 7/8/2009 Last visit: 6/7/2025 Posts: 1977 Rating: (479)	You have to install CT for these motors and CT connection can be given to any Current transducer (http://www.metersusa.com/Rish/Price/AmpPrice.htm)which will give you 4 to20 mA Regards, Devesh Vithani
	I dont Like people driving Fast, thats the reason I overtake them ;)
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This contribution was helpful to 1 thankful Users Ton Verra

7/15/2013 10:29 AM	Rate (0)
Ton Verra Gold Member Joined: 4/20/2007 Last visit: 12/18/2025 Posts: 731 Rating: (43)	Hi, Thanks. I realize it is what I need to use, but was wondering if any brands would be recommended. Brands carrying DnV, ABS, LR or similar certificates would be preferred.. What is common practice? Measure 1 or all phases?

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7/15/2013 12:17 PM	Rate (0)
umencho Grandmaster Joined: 3/21/2006 Last visit: 10/16/2025 Posts: 10239 Rating: (1183)	Ton Verra Hi, Thanks. I realize it is what I need to use, but was wondering if any brands would be recommended. Brands carrying DnV, ABS, LR or similar certificates would be preferred.. What is common practice? Measure 1 or all phases? Select the same brand which is using on the plant in order to keep less quantity of spare. I don't think there have a big difference. One or all phases - what is the target? Do not forget measirng each phase lead more analog inputs... Best regards, Hristo Mihalev

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7/15/2013 12:25 PM	Rate (0)
Ton Verra Gold Member Joined: 4/20/2007 Last visit: 12/18/2025 Posts: 731 Rating: (43)	I wonder what other people use. We use Schneider components mostly, but some special modules are better from other makes. To measure current drawn by a motor, 1 phase should be enough. But that won't detect any strange currents. I would think that would be one reason to demand current measurement

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7/15/2013 12:44 PM	Rate (0)
DS SURESH KUMAR Bronze Member Joined: 4/17/2012 Last visit: 11/21/2025 Posts: 474 Rating: (10)	Ton Verra I wonder what other people use. We use Schneider components mostly, but some special modules are better from other makes. To measure current drawn by a motor, 1 phase should be enough. But that won't detect any strange currents. I would think that would be one reason to demand current measurement Hi, In market you will get power measurement meter with display also. The output of these meters available in all methods, Ex: modbus,profibus,profinet,CAN so based on your CPU availability you can select

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7/15/2013 3:20 PM	Rate (0)
Vithani Platinum Member Joined: 7/8/2009 Last visit: 6/7/2025 Posts: 1977 Rating: (479)	Ton Verra I wonder what other people use. We use Schneider components mostly, but some special modules are better from other makes. To measure current drawn by a motor, 1 phase should be enough. But that won't detect any strange currents. I would think that would be one reason to demand current measurement In our plant, we are using CT in all 3 phases but that for meter connected on Feeder itself. For remote signal using Analong, normally we are using only one phase and that serves us most of the time. If you just want to show current then measuring 1 phase should be enough, for protection using comparing current (complex process), you will need all 3 phases Yes, there are Meters also available as said above, in our plant we are using Schneider's conserve EM6400 meters, which is somewhat costly option than using the transducer, but it can give you feedback on RS485 network and will provide all data like current in all phase, voltage LL,LN, PF, KWH and all But for short and simple, you can just use any brand as UMENCHO said and go for transducer for 4 to 20 mA feedback
	I dont Like people driving Fast, thats the reason I overtake them ;)
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7/15/2013 5:10 PM	Rate (0)
Ton Verra Gold Member Joined: 4/20/2007 Last visit: 12/18/2025 Posts: 731 Rating: (43)	Great thank you! (I'm out of thanks for today lol)

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7/15/2013 7:05 PM
Vithani Platinum Member Joined: 7/8/2009 Last visit: 6/7/2025 Posts: 1977 Rating: (479)	Ton Verra Great thank you! (I'm out of thanks for today lol) No problem - you can give me Double Stars and Thanks tomorrow
	I dont Like people driving Fast, thats the reason I overtake them ;)
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