ElectronGuru

MrPLC Member
  • Content count

    271
  • Joined

  • Last visited

Community Reputation

64 Excellent

2 Followers

About ElectronGuru

  • Rank
    Sparky

Profile Information

  • Gender
  • Location Missouri
  • Country United States
  • Interests ones and zeros.
  1. Kinetix 5500 lost power

    Have you checked the input power at the power terminal blocks on the drive? If power is verified with a meter at drive input, you likely have a drive failure. 
  2. PowerFlex 755 - Static tune

    @VFD Guy yep! For a 60-second spot check, rotate the motor shaft a 1/4-turn and check again, higher voltage checks are probably OK so long as you're doing that every week. But for a longer test, such as a ten-minute polarization index, I would stick with the motor nameplate values. Either way, I think we're on the same page.
  3. PowerFlex 755 - Static tune

    Megger testing at a significantly higher voltages than a motor is rated for could cause motor winding damage. Very few people will ever have a need for "proof testing" a motor, which uses higher voltages. Routine maintenance testing and troubleshooting tests should be done at as close to nameplate voltage rating as possible. @PaulKim1003 definitely let us know how it works out. :) Edited for a bit more clarity.
  4. PowerFlex 755 - Static tune

    @PaulKim1003 no, doing a tune isn't first on my list of things for this problem. If you suspect someone has played with the parameter settings, run the compare tool. Sometimes it's a quick and dirty check just to eliminate that as a possibility if you have co-workers who like to tinker. Hardware Overcurrent means the drive is working too hard to power the motor. If it is a parameter issue it's probably because someone changed the motor nameplate data or maybe the carrier frequency. It's far more likely the problem is in the wiring between the drive and motor, or the motor itself, as suggested by @Joe E..  
  5. PowerFlex 755 - Static tune

    My question is what happens to the parameters when I do the "static tune" ? Autotuning introduces a drive to a new motor. It sets the best possible values for IR Voltage Drop (P73), Ixo Voltage Drop (P74), Flux Current Ref (P75), and Slip RPM (P621). You only need to autotune when you're installing a new system or replacing a motor on an existing system. If you're replacing a drive and downloading a known good program from the previous drive, the autotune values will still be valid so long as it's the same motor.  The Static Tune energizes the motor but does not rotate it. Rotate Tune turns the motor without load coupled, while Inertia Tune turns the motor with the load coupled. Never autotune with process material present in the system, as this will throw the whole thing off. So if you're tuning a drive/motor where the motor is permanently coupled to a pump and the pump is cooled by the process material (and therefore can't be run empty) Static Tune might be the preferred method. and another question, is there a way to do only "static tune" without going thru all the steps in the startup wizard? You can access the autotune at parameter 70. From the HIM, select the type of tune you want to use, hit enter, then start. Also, if you're in the Wizard in CCW you're allowed to jump back and forth to any step you care to simply by clicking on the desired label in the Wizard Step menu. Since you have CCW available, before you start tuning you should run the Compare tool on the suspect drive against a known good drive. This might get you to the problem quicker.  Hope this helps and let us know how it worked out
  6. Rockwell Powerflex 700 fault auto reset.

    In the PowerFLex 700, parameter 174 should be "Auto Rstrt Tries" and when it's set to 0, auto-restart is disabled. Set to anything 1 or above to enable the auto restart feature. Parameter 175 sets the time delay (in seconds) between restart attempts.
  7. No voltage at outputs even when forced

    And, can you supply a pic or drawing of your wiring?
  8. No voltage at outputs even when forced

    What specific model of 1400 do you have?
  9. No voltage at outputs even when forced

    The power supply in a Logix device (whether ControlLogix, CompactLogix, SLC, or MicroLogix controllers) supplies power only to the cards in the chassis backplane, or the I/O modules (if added on expandable units) on a Compact- or MicroLogix bus. Power for the field devices must be wired from a separate, external power supply. Remember that digital outputs in any Logix controller are just optically isolated "relays" to conduct power from an external power supply to a field device. When an physical output is on (true in the logic or force table) you should get an LED indicator on the associated Logix module output status indicator. If you're getting that LED saying you should have an output, that means connectivity is established between the field power supply and the filed device, same as if closing a normally open contact on a relay. So, make sure you have an external field power supply properly wired to your MicroLogix controller and the field device(s). If you have a field device power supply properly wired, it's power is on, and you're getting the LED status indicator on the PLC's output, you need to check your I/O module and field device to make sure they're matched for sinking and sourcing. Not going to get into that here, but check the manual in this attached link, chapter 3: https://literature.rockwellautomation.com/idc/groups/literature/documents/um/1766-um001_-en-p.pdf If the field power supply is wired correctly, the LED status indicator on the PLC's output is on, your field device and PLC are matched for sink/source, and you're still not getting the output, the output itself may be bad. In ControlLogix chassis we can disable an I/O card but I'm not sure if that's true in the Micro-1400. Again, check the manual. Hope this helps.
  10. Can not connect MicroLogix 1000 to RSLinx

    You must use the driver for the communications format for that controller or network, and the driver must be properly configured. All Micro -1000 controllers should have DF-1 (RS232) embedded within them, and many have DH485. These are the only two drivers you'll likely ever need on a Micro-1000.  Whichever one you were using successfully before is what you should try to continue to use.  Serial drivers like RS232 can have several configuration settings, whereas other drivers, such as DH+, may only need to have the correct com port number set. I'm a fan of using the Auto-Configure button when it's available. Once you're back online with the controller, I'd use the "RSLinx Classic Backup Restore" utility to create a backup of the known good driver configuration. This link for the MicroLogix 1000 manual be helpful: https://literature.rockwellautomation.com/idc/groups/literature/documents/um/1761-um003_-en-p.pdf Chapter 3 is communications. 
  11. View PanelView Plus Configuration

    If you're wanting upload, convert to MED and peek inside the code, yes, you'll need FactoryTalk ME Studio. If it's 5.0 or lower you're going to need to call Tech Connect.  Also, whoever created and transferred the MER had the option to not allow conversion back to MED, or to allow conversion with password only. If that's the case, you'll never be able to recover the MED. I don't know of any way to determine that other than attempting to restore the MED and seeing if it restores, prompts you for a password, or says it can't be restored. If you're able to restore the MED, you'll find the HMI tags in an easy to access HMI tag file. You'll have to sus out the direct reference tags individually by going to the connections tab in the properties dialog box of every interactive object (like push buttons and gages) on every display. 
  12. View PanelView Plus Configuration

    You'll need to go to the PanelView's Configuration mode to get the configuration settings. Start here on page 59: https://literature.rockwellautomation.com/idc/groups/literature/documents/um/2711p-um001_-en-p.pdf As for the HMI and direct reference tags, those are in the PanelView's code, which the programmer would've written in FactoryTalk ME. The runtime (.MER) file would have to be uploaded from the PanelView to the laptop, restored to a .MED file, and then you'd have access to the tags.
  13. PID PWM RSLOGIX5000

    As a drives guy, when I think of PWM I tend to think in terms of both positive and negative pulse polarity (as opposed to only true and false), and those pulses are almost always in gigahertz. When I've needed pulse control for SCRs I've always used an external piece of hardware, as I described above. So... this particular thread is opening a new door for me.
  14. PID PWM RSLOGIX5000

    Great find, @BobLfoot!
  15. PID PWM RSLOGIX5000

    I assume we're using the same acronyms and by "PWM" you mean Pulsed Width Modulation. Off the top of my head I don't know of any Allen Bradley output cards or instructions that create PWM. There may be a process card out there that does that but I'm not familiar with it, and a quick glance at the ControlLogix Analog I/O Modules User Manual didn't turn anything up.  When I was doing IR welding we installed solid state SCR device that were like a very dumbed-down DC drive. A voltage signal directly from a PLC analog output card went to the input of the SCR driver, which then pulsed an output to the IR bulbs to control the temperature of the weld. Is this similar to what you're trying to accomplish? If you're in a closed loop system providing the actual temperature back to the PLC, you can certainly use the PID instruction to get tighter control of that temperature. I just don't think you're going to be able to PWM out directly from the PLC to a field device.