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- PC reliability?
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- PC reliability?
- Windows, real time
- PID loops
- PCs vs. PLCs
- Replacing people
- MS 'monopoly'?
- Software quality
- Where do we go from here?
- Why pay?
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-- Ken Thompson
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why the output current is higher than the input current in the servo?
New Replies:
By James Ingraham on 28 December, 2008 - 6:34 pm -
16.8 Amps at 400 Volts equals 25 Amps at approximately 600 Volts. Why 600V? That's just...
By Curt Wuollet on 28 December, 2008 - 2:56 pm -
To explain a little:
It's very difficult with this email setup as the previous discussion is not...
>The short answer is that they are at different voltages.<
Thank you, Can you explain a...
By Curt Wuollet on 27 December, 2008 - 4:21 am -
The short answer is that they are at different voltages.
Regards
cww...
Flash Upgrade Assistance
about inertia ratio of servo
New Replies:
By Ben Janvier on 27 December, 2008 - 2:31 pm -
This is the next question: How can we have good tuning but for different process operating...
The inertia ratio (or inertia mismatch) is must be taken into account for servo with low mechanical...
By Peter Nachtwey on 23 December, 2008 - 9:05 pm -
Yes, it is the coupling that makes all the difference. All the auto tuning software does is try to...
By James Ingraham on 22 December, 2008 - 5:16 pm -
LALIT DONGRE
"what is inertia ratio of any servo system?"
The other responses did a...
By Curt Wuollet on 19 December, 2008 - 11:37 pm -
And it points out that there will always be some empirical work with servos.
Regards
cww...
By William Sturm on 19 December, 2008 - 1:49 pm -
Inertia ratio is the load inertia/motor inertia. It impacts tuning because the load inertia can go...
By Ken Emmons Jr. on 19 December, 2008 - 1:13 pm -
The inertia ratio is the ratio of load inertia (what gets coupled to the motor) to the inertia of...
Torque limit switches on control valve drives
New Replies:
By Abhijit Goswami, Haldia on 25 December, 2008 - 1:02 am -
Measuring and limiting torque is standard features with motorised valves used mostly for On-Off...
Limit for opening and closing time of breaker?
The Autotuning method by CHIEN-HRONES und RESWICK deliovers too weak PID parameters.
New Replies:
By William Sturm on 19 December, 2008 - 2:47 pm -
I've never had too much luck with autotuning. You need just the right input data, and it is just...
I am looking for Modbus on RS485 Master source code for QNX/Linux.
New Replies:
By Don Lupo on 17 December, 2008 - 9:57 pm -
Acromag offers C-Library Source code and demo program for Modbus TCP/IP or UDP/IP. Go to...
Just wondering if there are lower cost alternatives out there to this 1024 step encoder.
New Replies:
By Curt Wuollet on 13 December, 2008 - 10:45 pm -
Speed might be another factor, some of the optical assemblies aren't optimized for high speed. 6000...
By Tim Economu on 13 December, 2008 - 1:35 pm -
If the max diameter where the sensor can be located is 7", then the circumference at that...
By Tim Economu on 13 December, 2008 - 1:20 pm -
Hi M:
The app note I referenced in the first post is a design for a motor control using an off the...
By Curt Wuollet on 13 December, 2008 - 3:44 am -
You could also buy reflective type sensor assemblies from the same vendors that would work even...
By M Griffin on 12 December, 2008 - 8:12 pm -
Let's back up a bit. What are you doing? If you want angular position to accurately control some...
By William Sturm on 12 December, 2008 - 3:18 pm -
That is a great idea...
I have seen motors that used digital hall sensors to sense the magnets...
By Tim Economu on 12 December, 2008 - 1:42 am -
Now I see my mistake!! I have been thinking only of digital solutions...even about the encoder...
By Tim Economu on 12 December, 2008 - 1:08 am -
I was thinking 180 deg opposite (sorry for the obvious pun). Since this is a BLDC exterior PM...
By Tim E on 11 December, 2008 - 9:23 pm -
Thanks Curt, I am leaning in this direction. My only reservation is contamination inside the motor....
By Tim E on 11 December, 2008 - 9:18 pm -
Yes that is the fundamental resolution needed.
I can find the optical parts for that price,...
By Jim Miller on 11 December, 2008 - 12:20 pm -
Assuming 1024 is the fundamental resolution and not post quad, the solution is most likely going to...
By Curt Wuollet on 9 December, 2008 - 1:04 am -
Cheapest would probably be an optical disk and a pair of optical interrupters, the small commodity...
By M Griffin on 8 December, 2008 - 11:30 pm -
Mechanical considerations can be more difficult with hall effect encoders than with optical ones....
By Tim Economu on 8 December, 2008 - 6:04 pm -
Thanks Curt:
Since I am designing the motor, the encoder will be inside the housing, and so it...
By Tim Economu on 8 December, 2008 - 3:10 pm -
Thanks Curt and all:
I am looking at the Avago parts, and yes this will be high volume. I am...
How to measure speed by using Linear Potentiometer in S7-200 PLC
Need circuit board for monitor on bosch cc100 controller...
Need a sensor which controls the angular displacement of the machine
Machine DATA
New Replies:
By clive lunn on 10 December, 2008 - 8:47 am -
I can help with your problem and spare parts.
Regards,
Clive Lunn
clivelunn at bellsouth. net...
Starting and Stopping a motor in the field with 1 x push button to save IO
New Replies:
For testing purpose, a single PB with continuous latched output for ON & break for OFF or even...
By Rob on 3 December, 2008 - 11:43 pm -
From a software point of view this can easily be made to work and I have seen this done.
...
By Roy Matson on 3 December, 2008 - 1:09 pm -
I assume you are suggesting one button with a toggle action in the PLC. I think you might run up...
Uploading updated project to processor
New Replies:
Sure.
Well, first off this job was done by outside company. After disabling the Unity logic...
Why not explain your solution to perhaps help someone else in the future?...
I know why this was happening so no need to reply to post....
Induction motor running beyond rated speed
How to program AB Powerflex 40 to reset to zero or certain preset speed after a stop command or power loss has occurred?
New Replies:
By driveguy on 1 December, 2008 - 5:50 pm -
What is your normal method of referencing? Where does the speed reference/setpoint come from now?...
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