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Member

Join Date: Mar 2017
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Current Unbalance in Motor When Connected to Siemens Masterdrive

04/19/2017 11:53 PM

I am facing low current on one phase and high current on other two phases of motor. But when i connected the motor with another drive (which is in use already) motor currents are perfectly balance. The drive type is 6SE7035-1EK60, 690A, 400V, simens master drive. I have replaced all three CTS, CUVC Card. But problem still presists. I am going to replace IGD card and IVI card now. Can you please tell me what is the source of the problem and what is its exact remedy.

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#1

Re: Current unbalance in motor when connected to siemens masterdrive.

04/20/2017 12:04 AM
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#2

Re: Current unbalance in motor when connected to siemens masterdrive.

04/20/2017 3:19 AM

There isn't one. Current imbalance is quite normal. In the limit, no load on two phases represents full load across one phase and the neutral for a single-phase load, for example.

Please tell the forum about the recent telephone discussions with Siemens on this topic, as there may well be something for the forum to learn from them.

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#3

Re: Current unbalance in motor when connected to siemens masterdrive.

04/20/2017 3:55 AM

I got rid of the issue. Yes, by replacing IVI card (interface card). Current feed back from CTs come to the control card (CUVC) via an interface card IVI. I have already replaced CTs and control card.

I always thought that there was some problem with current sensing loop, which is coming to the controller. As the controller takes IGBT triggering and current and torque limiting decision on this feedback, these parameters are getting wrong resulting in generation of functions for IGBTs controlling.

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#4
In reply to #3

Re: Current unbalance in motor when connected to siemens masterdrive.

04/20/2017 11:32 AM

Good on ya mate! It appears you are overdue for receiving your daily salt ration!

Your perseverance did pay off! Next time you already know what to do: Trade out IVI cards or the phase locations at the card input. If the problem moves around with wire assignment that should tell you something.

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