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I have "Hitachi" variable frequency inverter with built-in RS-485 serial communications, featuring the ModBus RTU protocol. I need to run 3 phase motor through this inverter.
I have 10,000 Cummins Generators in Eastern EUrope that I need connectivity to with out back end system. I have been tod several time, no problem, but to date no results.
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By Lynn August Linse on 16 August, 2012 - 1:26 pm -
Just be aware that in the US at least, GPRS is going away rapidly, with carriers not yet shutting...
By Andrzej on 15 August, 2012 - 3:08 pm -
Hello,
I think the solution can be embedded computer with GPRS modem like Moxa. You can log the...
By Lynn August Linse on 15 August, 2012 - 1:00 pm -
It is not as easy as anyone wishes :)
10000 generators = 10000 problems to solve over & over...
Sounds as if the Easy Connect Netbiter could be a solution for you. It is a cloud based solution,...
By nic on 14 August, 2012 - 11:18 pm -
So, exactly what do you need help with?...
I am wanting a robotic arm and controller that could potentially lift 5kg.
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By Ken Emmons Jr. on 14 August, 2012 - 8:42 am -
I use Epson Robots. Their programming is very high level and easy to
understand in my opinion....
We have a DVC6020 positioner be used on a "combustion air" damper with a single piston actuator. A Tri-Loop (HART converter) provides position feedback from the DVC6020 positioner to our Yokogawa Centum CS DCS. There's an intermittent problem with the position feedback...
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By J on 13 August, 2012 - 5:48 pm -
DO NOT WASTE YOUR MONEY! Valvelink is a total failure. We wasted tens of thousands on equipment and...
Communication between twido plc and w@de 315 rtu
from the aerodynamics, controlsystem,machines department...
motor drives for satellite reaction wheelsHi i am doing my M.Tech in control and instrumentation. i am in search of a motor drive for the reaction wheel, other than the conventional BLDC motor and the PMSM motor
Running a multiple phase motor on a single phase
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I agree with steve...another option is it could be a 1 with the greek letter phi after it for...
I my be wrong but I have never heard of an 11 phase motor, at least not in the USA. You my have a...
I want control rtu in modbus protocol via gprs internet
New Replies:
By Andrzej on 7 August, 2012 - 4:17 pm -
Hello,
For GPRS communication with Modbus you can use Embedded computer like Moxa. Custom...
By Lynn August Linse on 7 August, 2012 - 9:59 am -
You will either require a very intelligent GPRS device, or that your RTU acts as the MASTER, not...
torque at low speed
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thanks Richard,
as pointed out by you, 10 hz is/was not generally a problem for vfd.
in my...
By Richard on 1 August, 2012 - 10:31 am -
I think this may be caused by VFD. Your VFD may work bad at low frequency of 10 hz.
But frankly...
any web resources to develop skills in mechanical engineering?
Questions about ABB AC motor drive - ACS550
Definition of Droop and Isoch
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By Jaman on 28 July, 2012 - 12:48 pm -
Thanks a lot for your informative article. I have a query about the difference between speed droop...
basic differences between contactor and relay?
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By tamzrod on 27 July, 2012 - 10:36 pm -
from wiki
greater than 15 amps are called contactor
less than 15 amps - Relay......
Controlling speed and position of a permanent magnet dc motor (problem).
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By Leon on 24 July, 2012 - 4:59 am -
Yes velocity reference is a rate of position changes....
By Luci on 23 July, 2012 - 4:25 am -
Thank you Leon. C
an this work if I consider that the velocity is the rate at which I give the...
By Leon on 22 July, 2012 - 4:32 am -
The standard position loop has inner velocity loop (cascade structure). And velocity can be...
Need your advice. I'm planning to upgrade my air compressor. I have Duracraft air compressor for a while and motor is not working good anymore.
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> What are you folks using and do you like what you have? what do you think of Baldors? what are...
from the Maintainance- Motor Rewinding department...
troubleshooting and fault finding of AC servo motor windingsuggestion regarding fault finding in Mitsubishi AC servo motor
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By Bob Peterson on 8 July, 2012 - 8:33 am -
What is driving the overload alarm? Thermistor? Temperature switch? I^2t?
Does the motor run at...
LVDTs are used in a wide variety of applications, do you think which application are most common of using LVDT sensors?
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Jessica,
Your own company's website (www.itargetsensors.com) lists a lot of uses for LVDTs, many...
> Turbine Valve control
Thanks! How about hydraulic cylinder? ...
By Julie on 1 July, 2012 - 11:34 pm -
> LVDTs are used in a wide variety of applications. do you think which
> application are...
Can anyone direct me to a web site that reviews and/or compares the VFDs of different manufacturers, with particular interest in the Ethernet communication feature?
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By phinix on 3 July, 2012 - 12:01 pm -
Hi Robert
does The Altivar 61/71 support Ethernet/ip?...
How to determine speed command from position error?
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By Sanyam on 3 July, 2012 - 9:09 am -
Hello Tom,
I am very new to the Control Engineering field.
I am currently working on a...
By Tom Bullock on 29 June, 2012 - 9:18 am -
Jared,
You have a dynamic command position and a feedback position. The difference between the...
How to control the pulses of stepper motor
from the Don't worry, she'll be right... department...
AC Induction Motors - most useful speed range?What is the typical useful / useable speed range of an average AC Induction Motor driven by a Variable Speed Drive?
I am modelling the closure time of an ESD valve against Hydrocarbon release inventory (pressure, volume of flow, mass flow rate) in a FBR condition.
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By tuokpe Brikinns on 30 June, 2012 - 3:13 pm -
> What information has the manufacturer of your valve provided you?
The following information...
Why butterfly valves as control valves?
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By Geoff on 25 June, 2012 - 7:50 pm -
From a process control standpoint (not process condition), the actuator determines the quality of...
Looking for possible solution for a legacy replacement of a servo controller. Need help!
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Hi Kirk,
I have the same interest to use one of these modules 1756-M02AS or 1756-M02AE, for...
Electric motor drive change over with VFD and bypass circuit
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I would have to agree with Steve King. My best guess is that (and I may be pointing out the...
If you are just bring the fan up to speed slowly and do not intend to vary the speed during...
Amin... is this a commissioning problem, or is it something new in an existing unit?
Regards,...
I need to know how to make the connections
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By Leon on 18 June, 2012 - 3:20 am -
Look at Mach2 software for CNC - it use parallel port for stepper control....
Difficulty in Configuring HSC For multihead machine
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