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  1. singapore11singapore

    DC Motor and Drive

    Hi All, I have a two DC motor application; the motors are mechanically coupled. They are driven by 2 DC drives; one each. One of the motors has had its armature rewound. Now when I run this motor up with the DC drive I get to around 50% load and begin to hear loud humming...it doesn't trip as...
  2. singapore11singapore

    Siemens MV Softstart

    Good Morning Guys, A quick question: Do Siemens still make a MV softstart? The 81000?? And who is the third party who this softstarter is really from??.....Motortronics of something? I remember a number of years ago going to Thailand to fix a "Siemens/Motortronics softstart....but I have just...
  3. singapore11singapore

    rc filter and insulation monitor

    Hi, I have an RC filter across the three phase......R in parallel with C x 3 times on one side...all three connected to ground the other.. Connected to the same three phase I have an insulation meter. I can confirm that when the three phase filter is isolated from the circuit, that the...
  4. singapore11singapore

    Siemens 6RA70

    Hi, I have installed a Simoreg DC Master 6RA70 to a motor. It is running forward/reverse/jog etc.....no problem. However, the speed is slightly slow...90%, and I have maxed out the pot. Therefore is there a parameter wrong in my setup? There was no mention of the field current on the motor...
  5. singapore11singapore

    Old DC Motor Field Specs wanted

    Hi, I am lacking field information for the DC motor attached, can anyone assist? Regards Martinhttp://files.engineering.com/getfile.aspx?folder=ad46821b-0f4e-4a7c-8ea0-3f4372f39314&file=3310B3F4-FFAD-4D9F-846F-F9C35107CB203C23B06F-7900-48E0-A6DA-C819DD3CDE84_(1).jpg
  6. singapore11singapore

    eaton MV softstart MV4S

    Hi. has anyone seen one of these? Any comments on it? Asked to start one soon....and as usual, no info..
  7. singapore11singapore

    single hole or double hole lugs

    Hi, I am seeing more customers asking for double hole lug connectors from cables to busbar connection. what are the reasons for this? what are the advantages of double over single, and what are the disadvantages.

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