I just downloaded version 11.2 and it does not seem to have this problem. I can say when printing to a pdf file that the resolution is not what I expected. Seems it does not output true arcs and circles but rather an approximation that is pretty poor when you zoom in. Maybe there is a settings...
Ghillie,
Try going to Format/Dimension Styles and changing the text properties to a smaller size font. You should also be able to edit the arrows and extension lines to suit your needs.
Bill
Great physics question but I think more information would be needed to answer it.
Assumptions:
material being cut was identical in both tests.
What is known from the test results:
1) In the second test, motor current was cut in half indicating force (motor torque + blade friction) were also...
We have an application that requires the use of a frequency converter 480V/60Hz mains, 400V/50Hz loads. The 50Hz side must be a low distortion sine wave so a rotary phase converter is being considered.
(Scenario 1) On the 400V/50Hz load side we will have:
1) A constant 3-phase load of 10KW
2) A...
The load is a variable torque type (low torque at low RPM, high torque at high RPM).
I'm trying to graph what the motor and drive are seeing under various loading conditions and adjusting equipment selection and performance expectations until I reach a happy compromise. While I can do this by...
Thank-you jraef,
The application, sadly, does not have constant torque over the RPM range. From what I understand, the VFD is able to keep the motor in a fairly linear torque vs current mode, except perhaps down at the very low torque levels and RPMs.
If I can solve for voltage or current...
What is the best way to estimate 3-phase motor current and voltage when driven by a modern VFD at different RPM and torque loads?
Example Motor:
HP - 25
Poles - 4
Volts - 230V
RPM - 1748 rated (1800 SYN)
FLA - 59A
FL Eff - 92%
Torque ~ 75 ft/lbs
VFD input V - 460V (allows full torque above...
Thank-you for the replies, it looks like I should be able to work out the rest of the details now. And yes the overload torque listed above is indeed the total load + acceleration torque.
I'm still a bit unsure on the overload capability for a given motor. I see some motors list up to 3.5 X max...
Thank-you Skogsgurra,
If possible, I would like the VFD to limit the overload torque to about 225Nm total. I'm guessing this can be handled by setting a motor current limit in the VFD.
-Bill-
I have an application with wide motor RPM and torque requirements and could use some help / verification. Here is what the motor shaft will see for loading.
Continuous Duty torque curve:
302 RPM @ 50Nm (37 ft/lb) ~ 1.5KW (2 HP)
1800 RPM @ 65Nm (48 ft/lb) ~ 12KW (16 HP)
2200 RPM @ 75Nm (55...
moltenmetal The tanks get drained about every week so there is not a problem of refreshing the air pocket. Interesting idea about the Fluorinert.
"you'd have been money ahead to have used a stainless OEM sensor in the first place." We used to use a stainless diaphram industrial sensor, the...
Thank-you for the postings!
I had read a paper on using Parylele and Fluorosilicone together to enhance the life of a pressure sensor, but to be honest, most of the chemical jargon used was a bit over my head. I'll see if I can find the paper and post a link to it here. Maybe it will make more...
We are using 0-2 PSI pressure sensors to measure the fluid level in recreational vehicle holding tanks. The sensor assembly is made by another company using pressure sensor dies from a well known sensor manufacturer. The dies are housed in an ABS plastic fitting and the wet side of the sensor...
I was at a trade show a few years back and saw a large plotter(about a 4 ft bed)printing on canvas in full color. It was not real fast but had large ink wells.
I'm not sure if the ink was color fast or not, do you need a "permanent" ink?
You could just attach a sharpie to the tool holder of...
I went back to the spreadsheets and tried to determine why there was a small wh/lb/mi spread between vehicles regardless of vehicle weight or type. The only reason I came up with was the type of driving each vehicle is seeing. The shorter-range vehicles are probably doing mostly stop-and-go city...
Regardless if the RAM gets initialized to 0 or 1, your init routine probably is trying to restore RAM contents using the data stored in EE so you are back to where you were before the lights went out.
Figure your worst-case timing so that you have enough time to write your EE contents at least...
ljubex,
Are you using an external reset line on the micros? Sometimes reset lines make good antennas to pick up noise and reset your parts.
What is your Vcc level and low voltage detect level and if using brown-out, what level is it set to?
It may be that you don't have enough time to store...
As melone says, more info is needed to nail down the problem.
Do you have an innit routine that clears all RAM contents to 0? If so, are you over running the stack and stepping on the reset vector? Do you have a watchdog running that can reset the part?
Bill
Kermando,
Have a look at amploc sensors http://www.amploc.com/ look at the AMP and ZAP series. These sensors use a torroid core with a slit in them for the hall-effect sensor. They have a simple 5Vdc supply and the output is 1/2 VCC @ 0 amps and is ratiometric with VCC. We have used the AMP200...
