MID-7654 Current Limits

Hello,
I am using an MID-7654 drive to power DC servo motors with the following specifications:
- Continuous Current: 4.2A
- Peak Current: 21A
- Inductance: 1.92 mH
- Maximum Terminal Voltage: 50V
My original understanding was that the current limit DIP switches on the front panel changed the gain of the system such that a +/-10V input would correspond to the peak current limits (+/-) [Quote from the MID-7654 manual pg 10 - "The MID-7654/7652 varies the gain applied to the input voltage so the maximum input voltage corresponds to a current output equal to the peak current limit, Ipeak."]. Being paranoid like I am, I wanted to verify this thought before doing anything. For current settings of 0.85A/1.7A (cont/peak) I measured a gain of approximately 0.99A/V and for current settings of 1.25A/2.5A (cont/peak) the gain was approximately 1.0A/V (ie: no altered gain). In both cases the output current saturated at the specified continous current limit (for a continuous input voltage).
Based on the above measurements, I have the following questions:
- Do the DIP switches simply change the current limits without altering the actual gain of the MID-7654?
- If this is indeed the case, is there a way to change the gain of the drive such that +/-10V corresponds to a desired peak current range (say 4.2A or 4.9A)?
Thanks,
Chad

Hi David,
I have attached an Excel spreadsheet with the voltage and current measurements I made. I supplied the input voltage by directly accessing the DAC on the PCI-7344. The actual voltage measurements were made from the AOUT block on the back panel of the drive. The current was measured with a DC ammeter in series with the motor, while the output shaft of the motor was fixed in place to prevent motion.
As you can see from the measurements, the motor is not saturating right away and the gain is linear (~1A/V) with a slight DC offset. Voltages higher than those shown in the Excel sheet simply saturated the output current at the level specified by the DIP settings on the front panel. Since the output saturated around the selected limits, I would think that these current measurements are reasonably accurate.
Thanks,
Chad
Attachments:
amplifier_gain.xls ‏20 KB

Similar Messages

How do i regulate the voltage/current from the MID 7654

I am trying to control a linear motor using flex motion and the MID 7654 power drive, however there are variuos discprencies between what should happen and what is happening:
1) I have configured AXIS one as an open loop stepper, i have specified a target postion (1000) counts, Max reports movement complete however the power amplifier is outputing 50 volts as soon as motion is started and after it has finished. ( should this value not vary with varying speed and positions, i have tried and it does not ???)
2) If configuring the axis as a servo loop and specifying KP as zero, i still get a max output, should this not be zero also.
3) Follow intiialisation i get maximum output from the power amp. I realise the ax
is must be energised and a holding torque applied, but this is causing the motor to shoot off ! why ??
Any help or advice would be much appreciated !!!!

Hello,
MID 7654 is a servo amplifier and will only work with servo motors. Do not expect anything reasonable to happen when the axis is configured as a stepper instead of a servo as it's not the intended use.
After you configure the axis as a servo you need to tune the PID loop parameters. Until you do that the current sent to the motor will not be correct and you might see unexpected movement on your axis.
Also make sure the current settings of the amplifier matches the ones in the motor's spec sheet.
Hope this helps!
Regards,
Yusuf C.
Application Engineering
National Instruments

How do i Model the MID 7654

I am trying to produce a simulink model in Matlab of my force control system ( A servo motor , connected to the MID 7654, which is connected to the NI 7344 flex motion board, A force sensor connected to ADC-1 closes the loop). In order to complete the system transfer function i need to know what output voltage is being applied across the servo motor as it is this (if my understanding is correct) , which determines the current through the motor, the growth rate of which is goverend by the motor inductance. I know the NI 7344 outputs a signal between +/-10V, how is this acted upon by the MID7645??, the only onfo given in the manual is a current output, surely there must be an accompanying gain applied to the voltage which is then applied to the mot
or which then detemines the current running through the sytem. Any help which could help me better understand the system and produce a model would be much appreciated !.

There is no "characteristic" transfer function for our MID motor controller. That transfer function is going to be the result of the MID in combination with the motor that you are using. The output of the MID is going to be in current. That current is going to be related the current that you select with the MID's jumpers, and the voltage input that the MID receives from the Motion Control Board. This output is characterized by two charts that you can find in the MID's user manual.
MID's user manual
That current output plus the characteristics of your motor should allow you to calculate the relevant transfer function.

Axis resource allocation and the MID-7654

Hello All,
I am currently transferring my application over to use the MID-7654 instead of third party drives. Below is the start up process I am using to allocate the axis resources:
//kill and disable all axes
flex_stop_motion(boardID,0,NIMC_KILL_STOP,0x000F);
  flex_enable_axes(boardID,0,3,0x00);
//unmap all axis resources
  flex_config_axis(boardID,NIMC_AXIS1,0,0,0,0);
  flex_config_axis(boardID,NIMC_AXIS2,0,0,0,0);
  flex_config_axis(boardID,NIMC_AXIS3,0,0,0,0);
  flex_config_axis(boardID,NIMC_AXIS4,0,0,0,0);
//map encoder resources to axes 1 and 2
  flex_config_axis(boardID,NIMC_AXIS1,NIMC_ENCODER1,0,0,0);
  flex_config_axis(boardID,NIMC_AXIS2,NIMC_ENCODER2,0,0,0);
  //enable axes 1 and 2
u8 mask = MASK1|MASK2;
status = flex_enable_axes(boardID,0,3,mask);
Basically, I want to use the encoder resources for each axis for position/velocity monitoring and control the analog outputs directly to change the torque of the motors. Since my impedance control software is closing the position and velocity loops, I do not want to use the PID controller onboard the PCI-7344.
The above code worked fine with the third party drive. However, after starting up my application with the MID drive, all of the orange inhibit LEDs turn on and remain that way (I assume it is to do with killing and disabling all of the axes and not mapping output resources to them). Since I wasn't previously using the inhibit output from the motion controller, my application worked fine with the third party drive (I was still able to read the encoder feedback information).
Also, when I was using the MAX '1-D interactive' interface to verify my encoder feedback, if I move either encoder immediately after initialization the 'Motor off' and 'Following error' lights turn red. I assume this is due to the encoder moving without a command sent from the motor).
Can anyone see any problems with the above code segment or suggest an initialization procedure that would solve my problems. Or if all else fails, is it possible to control the inhibit signals directly to enable/disable the axes on my own?
Wow... I certainly rambled on a bit there.... If you need clarification on any points let me know. Also, I am on a bit of a time crunch, so a prompt reply would be greatly appreciated.
Thanks,
Chad

Chad,
I'm a bit astonished that you don't want to use the PID controller on the board. Onboard PID control is one of the main reasons why you would like to use a motion control board instead of a simple multifunction I/O device. The onboard PID loop of the 7344 can run with up to 16 kHz with very low jitter whilst using the DACs directly from your host application will result in a control loop with less than 200 Hz and a high amount of jitter - even if you were using a real-time OS. This will result in poor control behavior.
This is caused by the architecture of the board. The DACs can be controlled directly by the DSP on the board with high rates in a determenistic way but the host can access them only through the board's µController that runs the host communication in 5 ms cycles that can't be synchronized with the application on the host PC. So for this usecase a combination of e. g. a PCI-6229 (multifunction DAQ board with 4 analog outputs) and a PCI-6601 (4 counters with direct quadrature encoder connectivity) would do a much better job at even a lower price.
With this said I really can't reccomend the usage of a PCI-7344 as a pure I/O-board. Please provide some information why you want/need to choose this approach. There are a lot of options to build customized motion control systems. Please follow this link for some further information.
A key feature of every control system is deterministic behavior so you will need to run your application on a real-time OS. Otherwise you won't be able to get a reliable control behavior.
I can give you some more specific advice if you post some background information about your application.
Best regards,
Jochen Klier
National Instruments Germany

How can i connect the Faulhaber Motor to MID-7654?

How can i connect the Faulhaber Motor (3564 024BC, with Encoder HEDM 5500 B12) to MID-7654?
The Motor has following wires:
A: Hall sensor green; A: Phase brown; B: Hall sensor blue; B: Phase orange; C: Hall sensor gray;
C: Phase yellow; +5V: Voltage red; GND: Ground black
The Encoder has:
5: Channel B; 4: Vcc; 3: Channel A; 2: Channel I (Zero impulse); 1: GND
I don't know how I can connect the encoder to MID-7654 using these wires (what is Encoder Index? Instead of this i only have Channel I !)
Thanks!
WLAN

Unfortunately there are different designators for the encoder signal which NI refers to as encoder index. In your case I am pretty sure that the I channel is identical to encoder index.
Other designators I have found are Z (z-ero signal) and R (r-eference signal) for the index signal.
Make sure that the index signal is at the correct level. For most applications it should be active low (i.e. it should be at high level during most of a turn and go low when the index mark passes the opto switch, I think it should be like this on most if not all Agilent optical encoders as you have it on your motor. This happens for a very small turning angle only and is hard to detect when turning an encoder/motor manually, so if you try to find the index signal turn the motor/encoder veeery slowly.

MID 7654

Hello everybody,
I have been using MID-7654 for like 1.5years for now with the motion controller PCI-7358. I have encountered several problems and I now am controlling 4 different servo motors simultaneously. But today when I powered the system up, the motor connected to the 3rd axis of the MID-7654 wasn't responding to the commands. I opened MAX and saw that when I commanded any thing the motor wasn't moving at all, but the following error was increasing and the axis was killing itself. I tried to assign the axis 5-8 of motion controller to driver and again all axis except axe 3 was working.
Can there be sth wrong electrically inside the driver? Has anyone faced a similar problem? Is there a chance to overcome this problem changing the settings of the axis?
Thanks for all the responses in advance...
Gencer
Solved!
Go to Solution.

Thank you Jochen,
First of all I've never opened a thread with an implicit header like this before but I think this time though I've changed the header the browser sent my query word as a header. I've already tried everything you've offered. I've tried different cables, different motors and also I've verified these components using other axis and they worked.
So as you suspected there would be a very great chance that the MID-7654 has an H/W failure. In that case what can I do, I will check my guarantee situation? Do you think it can be repiared or what?
thanks again...
Gencer

Mid-7654 - ERRATIC BEHAVIOUR

This is a troubleshooting challenge.
I am using PCI-7344 control card with MID-7654 amplifier driving a three axis dc motor servo system.
Periodically the servo system does not work. There is no drive signal to the motor. At times we have seen commands to one axis result in another axis moving. Because it it intermittent it is highly frustrating.
If I insert a breakout box in the system to try to observe signals on scope, the system only works in one direction and only when scope probes are attached.
Any ideas? I have checked and double checked the wiring. It seems correct. I have tried increasing the drive output of the amplifier and there is no change.

Hi rws,
Could you please provide a wiring diagram (and maybe even some pictures) of how you have it set up? Also, what motor are you using? Has this ever worked before without issues? If so, what has changed?
Jeff | LabVIEW Software Engineer

Can I Connect a 6-wire Unipolar Stepper Motor to the MID-7654/7652?

I am trying to connect a 6-wire unipolar stepper motor to the MID-7654/7652 motor driver and was wondering how the wiring would work on that?

The connector is simply a pass-through for the signals generated by the motion controller card for hooking up to a separate driver compatible with stepper motors. It would be used if you had a combination of servo and stepper motors in your system used in conjunction with separate servo and stepper drives.
-AK2DM
~~~~~~~~~~~~~~~~~~~~~~~~~~
"It’s the questions that drive us.”
~~~~~~~~~~~~~~~~~~~~~~~~~~

I have a problem with my 15" MBP mid-2010 currently running Lion.

My laptop crashes for no apparent reason. The keyboard stay lit and the fans run but the computer is completely blacked out with the capslock button and all other buttons stuck and I have no choice but to forcefully power down the Macbook. Please advise.
I don't know what's happening and I am trying to steer away from spending any cash if necessary?
As a student i don't have much spare cash, my hard drive configuration is currently in striped RAID and i wonder if that's what's causing the issue.
Interval Since Last Panic Report: 126515 sec
Panics Since Last Report:          9
Anonymous UUID:                    A234557F-D522-4F8D-AC01-D9245C22BED9
Tue Mar 19 09:12:08 2013
panic(cpu 2 caller 0xffffff7f80a4d007): NVRM[0/1:0:0]: Read Error 0x00000100: CFG 0xffffffff 0xffffffff 0xffffffff, BAR0 0xd2000000 0xffffff811872f000 0x0a5480a2, D0, P2/4
Backtrace (CPU 2), Frame : Return Address
0xffffff80e2a3afa0 : 0xffffff8000220792
0xffffff80e2a3b020 : 0xffffff7f80a4d007
0xffffff80e2a3b0b0 : 0xffffff7f80b45b83
0xffffff80e2a3b110 : 0xffffff7f80b45bf7
0xffffff80e2a3b180 : 0xffffff7f80e47855
0xffffff80e2a3b2c0 : 0xffffff7f80b69ddd
0xffffff80e2a3b2f0 : 0xffffff7f80a56d6a
0xffffff80e2a3b3a0 : 0xffffff7f80a5243c
0xffffff80e2a3b590 : 0xffffff7f80a53668
0xffffff80e2a3b660 : 0xffffff7f81f8a4d9
0xffffff80e2a3b720 : 0xffffff7f81fbfeb6
0xffffff80e2a3b7b0 : 0xffffff7f81fa2e99
0xffffff80e2a3b810 : 0xffffff7f81fa32d1
0xffffff80e2a3b860 : 0xffffff7f81fa3694
0xffffff80e2a3b8f0 : 0xffffff7f81fa44ed
0xffffff80e2a3b930 : 0xffffff7f81f602a1
0xffffff80e2a3baa0 : 0xffffff7f81fa4d6d
0xffffff80e2a3bb60 : 0xffffff7f81f5d346
0xffffff80e2a3bbc0 : 0xffffff8000655f3e
0xffffff80e2a3bbe0 : 0xffffff800065681a
0xffffff80e2a3bc40 : 0xffffff8000656fbb
0xffffff80e2a3bd80 : 0xffffff80002a3f08
0xffffff80e2a3be80 : 0xffffff8000223096
0xffffff80e2a3beb0 : 0xffffff80002148a9
0xffffff80e2a3bf10 : 0xffffff800021bbd8
0xffffff80e2a3bf70 : 0xffffff80002aef10
0xffffff80e2a3bfb0 : 0xffffff80002daec3
      Kernel Extensions in backtrace:
         com.apple.NVDAResman(7.3.2)[97284661-2629-379E-B86B-D388618E8C30]@0xffffff7f809 e6000->0xffffff7f80ce1fff
            dependency: com.apple.iokit.IOPCIFamily(2.7)[5C23D598-58B2-3204-BC03-BC3C0F00BD32]@0xffffff 7f808bb000
            dependency: com.apple.iokit.IONDRVSupport(2.3.4)[7C8672C4-8B0D-3CCF-A79A-23C62E90F895]@0xff ffff7f809d4000
            dependency: com.apple.iokit.IOGraphicsFamily(2.3.4)[D0A1F6BD-E66E-3DD8-9913-A3AB8746F422]@0 xffffff7f8099b000
         com.apple.nvidia.nv50hal(7.3.2)[38ACBB3D-4E3C-3883-9A4B-67F15592905F]@0xffffff7 f80ce2000->0xffffff7f81004fff
            dependency: com.apple.NVDAResman(7.3.2)[97284661-2629-379E-B86B-D388618E8C30]@0xffffff7f809 e6000
            dependency: com.apple.iokit.IOPCIFamily(2.7)[5C23D598-58B2-3204-BC03-BC3C0F00BD32]@0xffffff 7f808bb000
         com.apple.GeForce(7.3.2)[7E1D7726-416F-3716-ACCB-E1E276E35002]@0xffffff7f81f520 00->0xffffff7f82014fff
            dependency: com.apple.NVDAResman(7.3.2)[97284661-2629-379E-B86B-D388618E8C30]@0xffffff7f809 e6000
            dependency: com.apple.iokit.IONDRVSupport(2.3.4)[7C8672C4-8B0D-3CCF-A79A-23C62E90F895]@0xff ffff7f809d4000
            dependency: com.apple.iokit.IOPCIFamily(2.7)[5C23D598-58B2-3204-BC03-BC3C0F00BD32]@0xffffff 7f808bb000
            dependency: com.apple.iokit.IOGraphicsFamily(2.3.4)[D0A1F6BD-E66E-3DD8-9913-A3AB8746F422]@0 xffffff7f8099b000
BSD process name corresponding to current thread: WindowServer
Mac OS version:
11G63b
Kernel version:
Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64
Kernel UUID: FF3BB088-60A4-349C-92EA-CA649C698CE5
System model name: MacBookPro6,2 (Mac-F22586C8)
System uptime in nanoseconds: 452764859288
last loaded kext at 18992049359: com.parallels.kext.prl_hid_hook          7.0 14922.693916 (addr 0xffffff7f807a8000, size 20480)
last unloaded kext at 165273820167: com.apple.driver.AppleUSBUHCI          5.1.0 (addr 0xffffff7f81763000, size 65536)
loaded kexts:
com.parallels.kext.prl_hid_hook          7.0 14922.693916
com.parallels.kext.prl_usb_connect          7.0 14922.693916
com.parallels.kext.prl_hypervisor          7.0 14922.693916
com.eltima.ElmediaPlayer.kext          1.58
net.telestream.driver.TelestreamAudio          1.0.5
com.parallels.kext.prl_vnic          7.0 14922.693916
com.parallels.kext.prl_netbridge          7.0 14922.693916
com.apple.driver.AppleHWSensor          1.9.5d0
com.apple.filesystems.autofs          3.0
com.apple.driver.AudioAUUC          1.59
com.apple.driver.AppleMikeyHIDDriver          122
com.apple.iokit.IOUserEthernet          1.0.0d1
com.apple.iokit.IOBluetoothSerialManager          4.0.8f17
com.apple.Dont_Steal_Mac_OS_X          7.0.0
com.apple.driver.AGPM          100.12.75
com.apple.driver.AppleHDA          2.2.5a5
com.apple.driver.AppleMikeyDriver          2.2.5a5
com.apple.driver.AudioIPCDriver          1.2.3
com.apple.driver.ApplePolicyControl          3.1.33
com.apple.driver.AppleUpstreamUserClient          3.5.9
com.apple.driver.SMCMotionSensor          3.0.2d6
com.apple.driver.AppleSMCLMU          2.0.1d2
com.apple.driver.ACPI_SMC_PlatformPlugin          5.0.0d8
com.apple.driver.AppleMuxControl          3.1.33
com.apple.driver.AppleLPC          1.6.0
com.apple.driver.AppleMCCSControl          1.0.33
com.apple.GeForce          7.3.2
com.apple.driver.AppleIntelHDGraphics          7.3.2
com.apple.driver.AppleIntelHDGraphicsFB          7.3.2
com.apple.driver.AppleSMCPDRC          5.0.0d8
com.apple.driver.AppleUSBTCButtons          227.6
com.apple.driver.BroadcomUSBBluetoothHCIController          4.0.8f17
com.apple.driver.AppleUSBTCKeyboard          227.6
com.apple.driver.AppleUSBCardReader          3.0.6
com.apple.driver.AppleIRController          312
com.apple.driver.AppleRAID          4.0.6
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
com.apple.BootCache          33
com.apple.driver.XsanFilter          404
com.apple.iokit.IOAHCIBlockStorage          2.1.0
com.apple.driver.AppleFWOHCI          4.9.0
com.apple.driver.AppleUSBHub          5.1.0
com.apple.driver.AirPort.Brcm4331          561.7.22
com.apple.iokit.AppleBCM5701Ethernet          3.2.4b8
com.apple.driver.AppleEFINVRAM          1.6.1
com.apple.driver.AppleSmartBatteryManager          161.0.0
com.apple.driver.AppleAHCIPort          2.3.1
com.apple.driver.AppleUSBEHCI          5.1.0
com.apple.driver.AppleACPIButtons          1.5
com.apple.driver.AppleRTC          1.5
com.apple.driver.AppleHPET          1.7
com.apple.driver.AppleSMBIOS          1.9
com.apple.driver.AppleACPIEC          1.5
com.apple.driver.AppleAPIC          1.6
com.apple.driver.AppleIntelCPUPowerManagementClient          195.0.0
com.apple.nke.applicationfirewall          3.2.30
com.apple.security.quarantine          1.4
com.apple.security.TMSafetyNet          8
com.apple.driver.AppleIntelCPUPowerManagement          195.0.0
com.apple.kext.triggers          1.0
com.apple.iokit.IOSurface          80.0.2
com.apple.iokit.IOSerialFamily          10.0.5
com.apple.driver.DspFuncLib          2.2.5a5
com.apple.iokit.IOAudioFamily          1.8.6fc18
com.apple.kext.OSvKernDSPLib          1.3
com.apple.iokit.IOFireWireIP          2.2.5
com.apple.driver.AppleHDAController          2.2.5a5
com.apple.iokit.IOHDAFamily          2.2.5a5
com.apple.driver.AppleSMC          3.1.3d10
com.apple.driver.IOPlatformPluginLegacy          5.0.0d8
com.apple.driver.AppleSMBusPCI          1.0.10d0
com.apple.driver.AppleGraphicsControl          3.1.33
com.apple.driver.AppleBacklightExpert          1.0.4
com.apple.driver.AppleSMBusController          1.0.10d0
com.apple.nvidia.nv50hal          7.3.2
com.apple.NVDAResman          7.3.2
com.apple.iokit.IONDRVSupport          2.3.4
com.apple.iokit.IOGraphicsFamily          2.3.4
com.apple.driver.IOPlatformPluginFamily          5.1.1d6
com.apple.driver.AppleUSBBluetoothHCIController          4.0.8f17
com.apple.iokit.IOBluetoothFamily          4.0.8f17
com.apple.driver.AppleUSBMultitouch          230.5
com.apple.iokit.IOSCSIBlockCommandsDevice          3.2.1
com.apple.iokit.IOUSBMassStorageClass          3.0.3
com.apple.iokit.IOSCSIArchitectureModelFamily          3.2.1
com.apple.iokit.IOUSBHIDDriver          5.0.0
com.apple.driver.AppleUSBMergeNub          5.1.0
com.apple.driver.AppleUSBComposite          5.0.0
com.apple.iokit.IOFireWireFamily          4.4.8
com.apple.iokit.IOUSBUserClient          5.0.0
com.apple.iokit.IO80211Family          420.3
com.apple.iokit.IOEthernetAVBController          1.0.1b1
com.apple.iokit.IONetworkingFamily          2.1
com.apple.iokit.IOAHCIFamily          2.0.8
com.apple.iokit.IOUSBFamily          5.1.0
com.apple.driver.AppleEFIRuntime          1.6.1
com.apple.iokit.IOHIDFamily          1.7.1
com.apple.iokit.IOSMBusFamily          1.1
com.apple.security.sandbox          177.9
com.apple.kext.AppleMatch          1.0.0d1
com.apple.driver.DiskImages          331.7
com.apple.iokit.IOStorageFamily          1.7.2
com.apple.driver.AppleKeyStore          28.18
com.apple.driver.AppleACPIPlatform          1.5
com.apple.iokit.IOPCIFamily          2.7
com.apple.iokit.IOACPIFamily          1.4
Model: MacBookPro6,2, BootROM MBP61.0057.B0F, 2 processors, Intel Core i5, 2.4 GHz, 8 GB, SMC 1.58f17
Graphics: NVIDIA GeForce GT 330M, NVIDIA GeForce GT 330M, PCIe, 256 MB
Graphics: Intel HD Graphics, Intel HD Graphics, Built-In, 288 MB
Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1067 MHz, 0x0198, 0x393930353432382D3030352E4130324C4620
Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1067 MHz, 0x0198, 0x393930353432382D3030352E4130324C4620
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x93), Broadcom BCM43xx 1.0 (5.106.198.19.22)
Bluetooth: Version 4.0.8f17, 2 service, 11 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en1
Serial ATA Device: INTEL SSDSC2CW240A3, 240.06 GB
Serial ATA Device: ST750LX003-1AC154, 750.16 GB
USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfa100000 / 2
USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0xfa130000 / 5
USB Device: Apple Internal Keyboard / Trackpad, apple_vendor_id, 0x0236, 0xfa120000 / 4
USB Device: BRCM2070 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0xfa110000 / 3
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8218, 0xfa113000 / 8
USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfd100000 / 2
USB Device: IR Receiver, apple_vendor_id, 0x8242, 0xfd120000 / 4
USB Device: Built-in iSight, apple_vendor_id, 0x8507, 0xfd110000 / 3

When you inserted the Snow Leopard DVD, did you hold down the option key while restarting? You need to do this to tell your iMac to give you the choice of booting from the DVD. Once you have reinstalled Snow Leopard you should be able to go to the App Store and reinstall Lion.
Good luck.

FF currently limits the number of open sessions

I currently programmatically launch FF on linux using an execl command. In the run string I use the -P option and launch my application by right clicking on the file that has its own mime type and that is opened by my app before the execl call. (my app takes a data file and creates a temp html file that is handed off to FF via execl) I check the system processes for a current running version of FF. If so I add the no-remote option.
This all works ok. However, if I attempt to launch another copy of my program FF will not allow this even though I am using a tab browser configuration.
I believe that one session of FF per "user" is acceptable but not the limit of one tab for each user other than the default user. I see my FF configuration eventually having several users as I begin to implement separate security policies for certain websites such as financial, casual, javascript development, no cookies, etc.
I typically keep well over 20 tabs open, if FF crashes I can loose everything as if the restore fails I must then hunt up each tab that I had open using history.
Can I get an update on where FF is headed with regards to the maximum number of users windows and the capability to open multiple tabs with a non-default user.

Sounds like you've got a connection leak - rather than increasing the number of open sessions, you need to constrain the application to use fewer!
If you don't ensure that the connection is closed even if an exception is thrown after it is opened but before it is closed then you are liable - likely even - to leak connections.
For example. Bad:
Connection c = getConnection();
... code here ...
c.close();Good:
Connection c = getConnection();
try {
... code here ...
} finally {
c.close();
}The same rule applies to ResultSet and Statement objects - and all three should be closed in the appropriate order (make sure you close result set and statement objects before re-using their reference).
(edit: rephrased ambiguous final para).

Video Capabilities -- Confirming Current Limitations (Record + Higher Quality Than Sorenson)

Hi,
Regarding video with Cocomo, I writing to confirm that the
current version does not provide the following two capabilities:
Recording. Acrobat Connect Pro includes record capability.
Am I correct that at this time Cocomo does not (yet) include record
capability?
Video Encoding. Am I correct that at this time Cocomo
supports only Sorenson Spark for acquisition of live video?
(Background: I have two clients seeking integrated video and text
chat applications with higher quality video for the primary
presenter. Flash Player supports playback of video encoded in
Sorenson Spark, On2 VP6, and H.264. For encoding of live video,
Flash Player (and by extension Cocomo) encodes only Sorenson Spark.
Adobe does, however, also support via the Flash Media Live Encoder
(FMLE) live encoding using VP6 and H.264. I assume that Cocomo
currently does not support integration with FMLE or any other
option for higher quality live video acquisition)
Thanks again for your support and this great new
product/service.
I look forward to Cocomo having its official commercial
release here in 2009! :-)
Best regards,
g

Hi Nigel,
Thank you for your reply.
Regarding the use cases ...
1) Union For Regular Member Meetings.
2) Pharmaceutical Training.
The first has looked at Connect Pro and the second currently
is using Connect Pro. Both cases seek both a higher quality video
for the presenter as well as to be able to record (for archive and
for "re-airing" by those unable to join live).
Regarding additional encoder in the presenter's "Player", I
think if just AIR could encode H.264 these client's use cases would
be satisfied. (These clients' goal on video quality fits a
1-to-many pattern. Requiring the presenter only to install AIR
seems a reasonably unobtrusive solution. Then, should attendee
video also be required, Sorenson via Flash Player should suffice.)
For both clients, having the hosted service from Adobe is
also an attraction (depending on pricing ;-)
Again, thanks for the great work of your team and everyone at
Adobe for bringing these solutions to the market.
Best regards,
g

Motor Control MID-7654 PCI-7340

Hello,
I'm configuring MAX settings for a servo motor with an embedded quadrature encoder. I set up the motor on Axis-1 and I'm simply trying to drive the motor without a load.
The motor has been able to drive under stepper motor settings, but the move is jerky and I don't have access to the encoder feedback. When I configure the motor as a servo, the encoder feedback is working properly.
Does anyone have any suggestions as to what to try?
Thanks!
-Erin
Solved!
Go to Solution.

climber_girl:
Not sure I understand your post- you have a servo, and when configured as a servo the feedback works.
Why then are you trying to set it up as a stepper?
-AK2DM
~~~~~~~~~~~~~~~~~~~~~~~~~~
"It’s the questions that drive us.”
~~~~~~~~~~~~~~~~~~~~~~~~~~

Overcoming 8.5mA current limitation

I'm neck deep in designing interfaces between low-cost USB digital output modules and various hardware. I seem to be having a hard time relay modules that will work with 5V at 8.5mA. Since I'm looking at up to 24 outputs I don't want to solder discrete components to a protoboard. I really like the Omega relay boards that I have used in the past but they are very expensive. Any suggestions for a less expensive alternative? Thanks in advance.
PaulG.
"I enjoy talking to you. Your mind appeals to me. It resembles my own mind except that you happen to be insane." -- George Orwell

SnowMule wrote:
AC doesn't do the popcorn thing anymore (at least not the last few orders I've put in; maybe the receiving guys are taking 'em out though ).
Maybe you just didn't order enough. Just last week I got a bag of popcorn as I watched my buddy unpack his brand new boards. But let's blaim receiving.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines

Don't know how to set current limit for servomotors in MID

My application is to control a servo motor. I�m using PXI-7350, driving a motor (Pittman GM8712F434) with MID-7654. The motor is connected to mechanic parts and mechanic parts are connected to a potentiometer as a feedback. Now, according to the spec of the motor, it said reference voltage 19.1V, inductance 5.4 mH, peak current 1.76 A. So, I set dip switch of MID to 0.85 A for continuous current, 1.70 A for peak current and standard inductance. The motor didn�t move and fault LED lighted. Then I set both continuous and peak current to around 1.7A. The motor still didn�t move and fault LED still lighted. I kept increasing the current until the current hit 3A. It started moving slowly but fault LED still lighted. Final
ly I set the peak current to 3.5A, the motor ran normally. Come to the questions.
1. Is the peak current in the spec same as peak current limit in MID? How to determine peak current limit? Because I�m afraid that my little motor is going to burn out.
2. How to set the continuous current; is it suppose to be half of peak current?
3. If +10/-10V command voltage(torque limit) gets map to peak current (let say 1.7 A), will +5/-5V be mapped to 0.85? And what happen after 2.7 sec if I set continuous current to 0.85A? Will +5/-5V be mapped to half of 0.85?
4. How does �2.7 sec� thing works? When I set peak and continuous current to 3.5A and 1.7A, after 2.7 sec motor should run slower or even stop (in my case), but it went nut like it ran at maximum current.
I set Kp 20 and others zero, everything else is same as default. Thank you, I appreciate your answer.

infoiupui,
There are several DIP switches on the front of the MID 7654 that can be toggled to vary the continuous and peak current values for the MID. There is a small panel that can be removed from the lower left corner of the MID. You can look in the manual for the 7654, linked below, to determine the particular settings that you should use to achieve given continuous and peak current values.
MID-7654/7652 Servo Power Motor Drive User Guide
http://digital.ni.com/manuals.nsf/webAdvsearch/E382785B7D67553E86256A5D0072BBE1?OpenDocument&vid=niwc&node=132100_US
Take a look at pages 10 through 13 of this document for information on how to modify those DIP switches to achieve current values that will work with the motor that you are using.
I am not clear on w
hat you are referring to when you referred to 2.7 seconds. Could you clarify that for me?
I hope that helps! Let me know if you have any additional questions on this issue.
Regards,
Scott R.
Applications Engineer
National Instruments

Port range triggering limitation - WRT600N - Most current firmware applied

Are there plans to enhance or correct the current limitation of the port range triggering?
Example
Triggering port range                            Forwarding port range
28955 - 28955                                         1024-65534
6131-6131                                                1494-1494
Although my triggering ports do not overlap; I am unable to save the above settings since the forwarded port range of 1494-1494 falls within the 1024-65534 range.
Basically, I can only use this feature with applications that do not overlap their forwarded ports. But, since there are many apps that use random ports within the 1024-65534 range this is extremely limiting.
Any help would be appreciated.
W

You can forward each port exactly once. The first entry in the list will always be the one executed. There is no other way to do this because otherwise the router would have to duplicate packets which it does not. Port forwarding is just a part of the NAT process. The error message prevents you from setting up those two forwardings which would be meaningless because the second 1494 forwarding would never occur.
The best approach is either splitting the range into multiple ranges and exclude 1494 completely or using the DMZ host feature. The DMZ host receives all ports which are not forwarded otherwise. This of course includes the privileged ports which you don't forward at this time but it may be a simple option replacing the first forwarding rule.

MID-7654 Current Limits

Similar Messages

Maybe you are looking for