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  1. RaulChavez

    Sincronous Motor fault

    How can a low field current drives the motor to a 200% stator current?, looking the "V-curve" for this motor with a field current arround 0,33A we have a stator current like 270A, also with a field current about 5,38A the stator current go to 4A, with field current = 6,15 the stator current goes...
  2. RaulChavez

    Sincronous Motor fault

    Hi I´m working with a 9600hp 40 poles (180rpm) sicnronous motor with a brushless exciter. My question is: is possible to drive this motor to a extreme condition of 200% of nominal current and 160rpm by increassing the exciter volt? This was a real condition, and I´m trying to figure out if the...
  3. RaulChavez

    VFD condutor sizing

    Hi, I´m doing the eletrical project for a 300hp belt conveyour motor. It will work wiht a VFD that have to supply 140% of motor start torque. My question is, how can I define the right power conductor for this application since we have 450mt between the MCC and the motor. I´m looking for my...
  4. RaulChavez

    Locked rotor definition

    The great concern is: how prevent the motor blow again, and also define who will pay the motor repair. Tomorrow we will start this repaired motor uncoupled, I will take the current vs time graphic and probably next Wednesday we will start this motor with load. I have read something about the...
  5. RaulChavez

    Locked rotor definition

    According the motor specification. This motor was projected for a direct start. The start torque is 260% and the start time is 0.5sec!!! So that the combination of high start torque in a very short period (0.5sec)will explains the short locked rotor time. Maybe for this motor the minimum time...
  6. RaulChavez

    Locked rotor definition

    Thanks, I´m trying to do an inquiry about this damage, I´m quite sure that the problem was due the consecutive starts, but I want to be sure that the ANSI protection N 66 (consecutive starts) becomes a critical issue when we work with motors with a very short locked rotor time.
  7. RaulChavez

    Locked rotor definition

    Hi, I´m working with a motor that blew during commissioning. this is a 1000cv@4000Vac motor with a locked rotor time = 3.5sec. According the vendor recommendations, we can do 3 starts per hour: one start each 20 minutes. According the relay records, this motor was started many times in a short...
  8. RaulChavez

    hart protocol adapters

    hi, I have the following problem: I can´t do the comunication between one temperatura transmitter and the PC to to the calibration. I´m usin a raytek infrared transmitter I believ that the problem is on the DB25 to DB9 adapter, Where can I find the pin configuration for this raytek hart adapter?,
  9. RaulChavez

    Siemens S7-412

    Hi, I have a client requieremt that ask for hart instrumentation asset management. My question is: can I do this using Siemens S7-412 hardware?

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