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12/29/2010 6:52 PM | |
Joined: 6/4/2008 Last visit: 9/15/2024 Posts: 1497 Rating: (324)
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Hi, if I understand your description correctly, you are trying to accelerate one motor to full speed and then switch a bypass contactor directly onto the mains, and at the same time disconnecting it from the drive. Then you want to accelerate a second motor in the same way using the same drive. It is generally not advisable to have motor output contactors with Micromasters. See the Installation instructions in the manual and also thisFAQ I think the reason for the noise is quite obvious. You are assuming that the input phase frequency and the drive output phase frequency are exactly in phase. I don't believe the drive synchronises the input and output phases, so in the worst case scenario, it is possible that you could switch from full positive amplitude on all phases to full negative amplitude instantaneously which the motor WILL NOT LIKE very much. What you really need is a Soft Starter, find Catalogue LV 1 - Sirius, Sentron & Sivaconhere: Best regards, Graeme
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