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  • Users: mohamedone
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  1. mohamedone

    Overvoltage trip on Siemens VFD

    helo pitt Inductive loads cause transient voltages when switched off.You must shutt off the power to the vfd before swetching the off the load ,umless it is programmed for that.How did you choose the programming parameters for the vfd. if the problem persists, I suggest the use of...
  2. mohamedone

    Overvoltage trip on Siemens VFD

    Hello pitt As we all know,a VFD is a one way device. since the input voltage ia within tolerence,the trouble is in the output.It happened with me ,my assemblers switched the input and the output,one vfd burned out no protection,another was saved have one. Therefore,you have a...
  3. mohamedone

    Reverse 240V Motor

    Hello Waross Thanks for the comment. In fact what you suggest is ture for a start capacitor (plastic cased)which can't stay in the circuit more than few seconds, or it may burn and even explode.on the other hand run capacitrs(metal cased round or oval) are designed to stay no trouble as long...
  4. mohamedone

    Reverse 240V Motor

    Hi keith Just switch the capacitor from one coil to the other; i.e from the starting winding to the running.Leave the capacitor end connected to the neutral in place , switch the coils in the other end of the capacitor good luck mohamed

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