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  1. cccelcj

    Controlling direction of motor rotation

    Hello. I have a Siemens 3RK1315-6LS41-3AA-5 motor starter with reversing contactor. Is it possible to use the digital inputs to reverse this device? If not, is it possible to use ASI to accomplish reversing. The reversing would only need to be done in a jog fashion momentarily upon occasion.
  2. cccelcj

    Siemens Step 7 declaring local variables

    I am somewhat new to Step 7, but not to PLC's. I seem to have a problem grasping the concept here when it comes to the inputs and outputs of what Siemens calls the "Variable Declaration Table". Are these I/O real physical inputs and outputs?
  3. cccelcj

    Dc motor series field with a regenerative dc drive

    Don't quite know what the drive is doing at the time. However, the drive that I just recently worked on was in field weakening at the time. Motor speed range is 400 - 1600. The drive top speed is set at 1200. Part of the problem I encountered while tuning is that there is no field data. The...
  4. cccelcj

    Dc motor series field with a regenerative dc drive

    The reason I asked was because on more than one drive (this one included), when the motor was stopped, it the went in reverse for maybe more than a complete revolution. could this have due to regenerative effect, or the series field overpowering the shunt field?
  5. cccelcj

    Dc motor series field with a regenerative dc drive

    "The point may be reached where the series field will overpower the shunt and the motor will reverse." Do you mean the motor will reverse while it is motoring? Or could it reverse after the motor is stopped?
  6. cccelcj

    Dc motor series field with a regenerative dc drive

    Yes, this is actually a shunt motor with a series field. I figured it to be a compund motor. However I have heard this motor being referred to as "stabilizing shunt". I do not know the difference. The drive could not be tuned because it was overrated for the motor which is very old. We ended up...
  7. cccelcj

    Dc motor series field with a regenerative dc drive

    Can a dc motor with a series field be used on a FlexPak 3000 regen drive? Or any regen drive for that matter?
  8. cccelcj

    Compound motor vs. stabilizing shunt

    I always thought that if motor had a series field and a shunt field it was a compound motor. What is a dc motor with a stabilizing shunt?
  9. cccelcj

    Ultra 3000 servodrive has E44 error code

    This drive runs for a period of time but eventually faults on E44. Does anyone know what this error means? Any help is appreciated.
  10. cccelcj

    How to select a resolver for an AB 1326AB servomotor

    I did try. They were not able to help me. They recommended I contact Allen Bradley. They (AB)are wanting me to send the motor in. I know the resolver is bad. If I could just find a replacement, everything will be fine. This is a resolver which has a 68pf capacitor in the excitation winding. It...
  11. cccelcj

    How to select a resolver for an AB 1326AB servomotor

    I have a bad resolver on an Allen Bradley servomotor. It is an AB 1326AB-E3E-11-TJB. There are no numbers on the resolver. I can get no information from the manufacturer. How can I go about sizing up a suitable replacement? Any help is appreciated.
  12. cccelcj

    Reliance vfd tripping on "overcurrent"

    We are able to turn it with very moderate force. We have surely ruled out a problem with the crank shaft. When we unload the motor, the speed and current of the motor are normal. It is as though the slip of the motor is high and we never reach the breakaway torque required before the drive trips...
  13. cccelcj

    Reliance vfd tripping on "overcurrent"

    I have entered into the drive the nameplate data from the motor nameplate. The rpm is 1750. Full load current is 36 amps. I am not able to check this now,but I beleive in order to run this drive in the vector mode, I need an encoder, which there isn't one. I might add when I had the motor...
  14. cccelcj

    Reliance vfd tripping on "overcurrent"

    I have a Reliance GV3000 which trips on "OC". I have a 30hp, 480v motor with a 60hp drive. The LRC goes up to 78 amps in about 4.5 seconds. Then the drive trips on overcurrent. I have tried to adjust the acceleration slope having numerous values from 5 seconds to 20 seconds. The drive still...
  15. cccelcj

    Design letter vs. code letter on motor namplate

    Can anyone explain the difference between code letter and design letter date found on motor nameplates? It apperas though both are related to locked rotor current. What is the difference between the two?
  16. cccelcj

    Need help Brown Boveri dc drive

    I do not recall if they are marked R1 and R2. They are the only pots on the board. The board has multiple functions as I can recall. Speed regulator, current regulator (I think) and monitoring. Assuming that these are for current limit, is there a procedure for setting them? Would they have...
  17. cccelcj

    Need help Brown Boveri dc drive

    Thanks, skogsgurra. I am not at the drive right now, but I will be returning early Monday morning. I am to remove the drive because it is reasoned it needs to be repaired. I am not sure of this. There are two pots I believe are directly under the leds. They are on the regulator board. Possibly...
  18. cccelcj

    Need help Brown Boveri dc drive

    Has anyone worked on a Brown Boveri AAD 6001 dc drive? I have one on a Gleason machine that controls a Reliance 60HP dc motor. The drive trips frequently. There are leds on the regulator board and I do not know what they indicate. I have no manual. Can any steer me in the right direction?
  19. cccelcj

    PE-95-K Power Unit

    I have an ac generator I am trying to evaluate. It is Made by O'Keefe & Merritt. When I hold in on the start switch, the unit starts. But when I let go of the start switch, I lose my output. It is as though the start relay is not being latched. Can anyone help me with this problem? Thanks
  20. cccelcj

    How to determine polarity on three phase motor?

    Thanks guys. I have indeed gained some useful information. I have printed and filed all your replies for future usage. The issue has been resolved thanks to your timely and accurate responses.

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