DAC voltage capped when operating in torque mode with load cell feedback

Hi, i'm doing a tension control on a cable driven system using servo motor. I had connected a load cell as analogue feedback for cable tension into the labview programme suggested in http://www.ni.com/pdf/manuals/371242c.pdf (Figure 13-3. Torque Control Using Analog Feedback Using LabVIEW)
Problem 1: The response between desired tension and actual tension is good until about 80N, when the motor stops responding to higher torque changes. The voltage output in DAC is only 4-5V (max voltage output is suppose to be 10V) and the motor and amplifier had been verified to run up to 200N. What is limiting my DAC?
Settings:
Card: PCI-7350
Analogue input: 0-5V
Problem 2: I had implemented a low pass filter of 30Hz in MAX for the load cells. The effect is quite good for the low tension. However, as the tension increases, the noise increases proportionally too, causing vibrations and switching sounds to be heard at higher tension. Is there anyway to overcome this?
Please help. Thanks

I can't see anything special with your settings, so I currently don't have a clear understanding, why the output voltage is limited.
Could you please test the analog output? You could do this configuring the axis as an open loop stepper axis. This will allow you to set the analog output with Load DAC.
Does this allow you to output higher voltages?
Could you please do the test with and without signal connection to the analog output? Maybe the input impedance of your drive is too low and pulls down the board's output voltage.
I hope that helps,
Jochen

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com.apple.iokit.IOSerialFamily          10.0.5
com.apple.iokit.IOAVBFamily          1.0.0d22
com.apple.iokit.IOEthernetAVBController          1.0.0d5
com.apple.iokit.IOAudioFamily          1.8.3fc11
com.apple.kext.OSvKernDSPLib          1.3
com.apple.driver.ApplePolicyControl          3.0.16
com.apple.driver.AppleGraphicsControl          3.0.16
com.apple.iokit.IONDRVSupport          2.3.2
com.apple.kext.ATI2600Controller          7.1.2
com.apple.kext.ATISupport          7.1.2
com.apple.iokit.IOGraphicsFamily          2.3.2
com.apple.driver.AppleSMC          3.1.1d8
com.apple.driver.IOPlatformPluginFamily          4.7.5d4
com.apple.driver.AppleFileSystemDriver          13
com.apple.driver.BroadcomUSBBluetoothHCIController          4.0.1f4
com.apple.driver.AppleUSBBluetoothHCIController          4.0.1f4
com.apple.iokit.IOBluetoothFamily          4.0.1f4
com.apple.driver.CoreStorage          182.10
com.apple.iokit.IOUSBHIDDriver          4.4.5
com.apple.iokit.IOSCSIBlockCommandsDevice          3.0.1
com.apple.iokit.IOUSBMassStorageClass          3.0.0
com.apple.driver.AppleUSBMergeNub          4.5.3
com.apple.driver.AppleUSBComposite          3.9.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.0.1
com.apple.iokit.IOBDStorageFamily          1.6
com.apple.iokit.IODVDStorageFamily          1.7
com.apple.iokit.IOCDStorageFamily          1.7
com.apple.driver.XsanFilter          403
com.apple.iokit.IOATAPIProtocolTransport          3.0.0
com.apple.iokit.IOSCSIArchitectureModelFamily          3.0.1
com.apple.iokit.IOFireWireFamily          4.4.5
com.apple.iokit.IOUSBUserClient          4.5.3
com.apple.iokit.IOAHCIFamily          2.0.7
com.apple.iokit.IOATAFamily          2.5.1
com.apple.iokit.IO80211Family          411.1
com.apple.iokit.IONetworkingFamily          2.0
com.apple.iokit.IOUSBFamily          4.5.3
com.apple.driver.AppleEFIRuntime          1.5.0
com.apple.iokit.IOHIDFamily          1.7.1
com.apple.iokit.IOSMBusFamily          1.1
com.apple.security.sandbox          165.3
com.apple.kext.AppleMatch          1.0.0d1
com.apple.security.TMSafetyNet          7
com.apple.driver.DiskImages          331
com.apple.iokit.IOStorageFamily          1.7
com.apple.driver.AppleKeyStore          28.18
com.apple.driver.AppleACPIPlatform          1.4
com.apple.iokit.IOPCIFamily          2.6.7
com.apple.iokit.IOACPIFamily          1.4
This is all double dutch to me.
Would anyone be able to help please???
Thank you very much !!
Dave

Hi, for other peoples information - I finally figured out the problem. It was actually a faulty RAM module which I had bought. I had upgraded from 2 to 4 gb of RAM using an approved type of RAM for my particular computer. Finally I removed one module of RAM (after doing nearly everything else under the sun including trying to reinstall the operating system and wipe the computer etc) and the computer worked fine.
Dave

MBP shuts down suddenly when running in battery mode

Hi
I am from Zaragoza (Spain) and lately (about 2 months ago as I can remember) my mbp shuts down when running in battery mode and without any advice. I see some of you also have this problem.
I thought it was me not seeing the low battery indicator but last week I realized the battery was above 40%!!
This problem has been repeating and the battery level was between 40% and 60% when my computer shut down.
What am I supposed to do? My MBP is still in warranty and I bought it in the online apple store.
Thanks for the help.

In the system profiler it says the cycle count to 24. The laptop is from late March 2008.
The battery info is the following:
Battery Information:
Model Information:
Serial Number: Sony-ASMB012-3841-b0b7
Manufacturer: Sony
Device name: ASMB012
Pack Lot Code: 0000
PCB Lot Code: 0000
Firmware Version: 0110
Hardware Revision: 0500
Cell Revision: 0303
Charge Information:
Charge remaining (mAh): 1718
Fully charged: No
Charging: No
Full charge capacity (mAh): 1875
Health Information:
Cycle count: 24
Condition: Check battery
Battery Installed: Yes
Amperage (mA): -2133
Voltage (mV): 11757
I did the SMC reset, but I cannot complete the Battery Calibration, the laptop shuts down at half charge battery and does not go to sleep mode.
Thanks for your help.

AKD Drive Ethercat Torque Mode

I know that similar questions have been asked before without a satisfactory answer (thread), but we are trying to operate an AKD drive in torque mode over an EtherCat interface using a cRIO-9022. I have located and been testing PaulRB's workaround (link), but we seem to have a problem.
When attempting to use "Test App.vi" to run my drive, I receive the error "Error -70228 occured at Axis when executing 'Power' on Axis 1 at Invoke Node in Test App.vi". Labview seems to think that the drive is not enabled, but I have checked that the hardware enable is active (works in Kollmorgen Workbench). Additionally, I can get the drive to move using the Interactive Test Panel in Labview using the built-in AKD axis binding. I am using:
LabVIEW 2012
LabVIEW Real-Time 2012
NI SoftMotion Standard 2012
NI RIO 12.0.1
NI Industrial Communication for EtherCAT 2.4
It is unclear to me if this problem is related to the fact that we are using Softmotion Standard 2012 instead of Softmotion Premium 2012, or is something else entirely. Our group is currently on a tight budget and I would hate to advise them to upgrade the Softmotion module only to have this problem persist (or discover some other issue).
Assuming that the Softmotion module is the problem, is there a way for us to evaluate the Softmotion Premium module before I recommend an upgrade?

Hi MrFisher,
I don't think it's likely that upgrading to Softmotion Premium will solve your issue, but if you would like to test this you can download the Softmotion evaluation. When you download the evaluation from National Instruments it should be the premium version. You can find this download here, http://www.ni.com/labview/softmotion/ .
As for this error, I've seen it pop up for two reasons. One is if the drive enable input is not connected. The second is if the emergency disable has been triggered or manually turned on. Do you think either of these could be the case in your system?
Miles G.
National Instruments
Applications Engineer

Lightroom freezes when I enter WEB mode

Hi, I have another question. I find that Lightroom freezes when I enter WEB mode and try to build a web presentation using this feature. I'm currently running XP as my operating system, 4 gb RAM, with an AMD DualCore 4600+ processor.
Thanks for your help,
DLMST

How do you go to the Web Module? Do you go from the grid with all your images, potentially hundreds to thousands of images or do you first make a Collection of you chosen images, More likely to be tens to maybe couple hundred of images.
If the former, LR maybe hanking on the renderign of so many images to what ever initial template Web is set for.
Best to do a selection of images to a Collection First. What happens if you go to Web with a Collecion of say, 50 images?
Don
Don Ricklin, MacBook 1.83Ghz Duo 2 Core running 10.4.10 & Win XP, Pentax *ist D
http://donricklin.blogspot.com/

DAC voltage capped when operating in torque mode with load cell feedback

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