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Hi Campa I used fix DC drives pcb's ...usually with no schematics...if the drive is that old then it going to be op-amps..... Yes that would most likely be scr for the armature...and the rectifier bridge is for the field....that would be the power element....make sure you have a DC...

I think there is a Federal Communications Commission in the U.S that regulates common-mode noise levels...I'm not familiar with it....but there is always someone regulating something.

Shaft current can be caused by dissymmetry in the magnetic circuit or by an uneven air gap. Usually, the PWM of the inverter switches in a pattern ..6 times per rotation of the stator magnetic field, ..(6 switching states)...usually.... you have other systems and this will be higher exp on a...

Yokogawa...I think that has it, but I'm not overly familiar with the package, but I do vaguely remember seeing it. I've also seen it in LabVIEW..not sure if that was standard or not....but it wouldn't surprise me if that was standard in LabVIEW( not a plc package ) is a big package. Any...

Plot the data out in the PLC there is a feature on Omron where you can plot data......I've used this feature in the past very handy. This will show you what the plc software is "seeing". If you are saying that this is a hardware issue...maybe the load cell has some hysteresis in it and it's...

Sure you knock something up with some software ... some parsing routing would do that

Hello Mausahwrtsila Comms errors are always difficult to fault find especially if they are sporadic. Cabling issues is a good place to start...drop lengths , cable type (usually Belding cable), screening, connection ...this is usually very specific to the supplier. The other things are a little...

Hello Alois.. I know this is an old thread so it's a bit of a reach. I developed the back end of a compiler ( a LL1 parser )....it converts ladder to c code. It's not a complete solution just something I put together...I had some ideas that I was tinkering with .. But besides that...the point is...

Hi Amornrat... I can point you in a direction ....google "Step change and transfer function" The step would be a go to position x and zero and then you would plot the position of the valve vs time......I think that would be a first-order system( if you ignore energy source from flow ) ...that's...

Hi James I believe that would be stator inductance. Ls So the graph is current vs time... the time being measured in units of cycles( haven't calculated how long one cycle takes ) So the stator is essentially made up of leakage and magnetising inductance. Send me an email and I will make it...

Hi ControlsGuy25 Yes I applied the method got about 49 ohms, bearing in mind that the noise from the CT is awful ..so I stuck an exponentially weighted filter in there and some other things( there is a lot going on in the measurement ) I will put a screen shot of it below. I also just measured...

Hi ControlsGuy25 Thanks for that it looks like I'm having some issues with that ...giving me some error message that I'm not allowed to do that I have the name of the test so I can have a look around. Did you give it any thought on my approach to the test ...I did do some experimentation and...

Hello all... You can override the default FB with your own customized version...this could account for why they are not the same as the OEM. ....if that helps. If I remember correctly you need the offline version of that FB code. As for PCS7 it is a difficult system to fault-find remotely...

Hi Load cells to measure the mass...and a signal conditioner. Google load cell conditioners. If you want to make the conditioner then that's another story... Keep in mind that you must be able to tare it and calibrate to read the correct weight, have no drift ...etc, etc My suggestion is to...

Hi ControlsGuy25 Thanks for that ....I can't find that

Hi ControlsGuy25 Thats sounds great,,,,here's a daft question what a PM?

Hi ControlsGuy25 Hello ControlsGuy25 thanks for that ,,,,I will have a look. The test motor is a 0.12Kw 3 phase asynchronous motor. I don't believe that it will be a double cage. It is a cheap motor( just for testing ). I am aware of how the motor characteristics are impacted by different...

R = V/I....assuming the load stays the same then solve current ...it should come down....just measure the current or like David says look at the rated current on the device/s usually, the manufacture gives a recommendation of fuse...fast blow...slow blow...rating

Sounds like you want to make a control loop with PID control. The total dissolved solids are being measured currently how? is this a fluctuation in the instrument or the actual product? If it's the product ...then I would say that is the root cause is at the source. If that's not feasible to...