[PSUBS-MAILIST] MK-101 Connectors

[Alan James via Personal_Submersibles]

Just another factor in the equation;
If we are looking at a 2 wire cable it would have to be packed out round
to seal in the blue globe cable glands.
Perhaps this is why subconn don't have a 2 wire connector, as it would end up the same 
dimensions as a 4 wire (pin) connector.
The 4 pin subconn connectors I have, have packing in the cables.
Alan


________________________________
 From: Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Sent: Tuesday, August 5, 2014 9:34 AM
Subject: Re: [PSUBS-MAILIST] MK-101 Connectors
 



I don't think the HPBH4 is practical unless our discounted price
      is less than what a two-pin connector (100 amp or better) would
      cost someplace else.  I'm surprised SubConn has a four-pin that
      can handle 200amps but not a two-pin that can handle 100 amps.  I
      have asked them to give me a price on producing a two-pin 100amp
      connector and we can compare that price against a competitor's
      product.

I only suggested SubConn because of the significant discount they
      provide us but I agree that if we can't find a product that works
      well for us then we need to seek out other resources.  However,
      I'm also not sure we've agreed to a "standard" yet and I think we
      should do that first.  We should agree to a specification. 
      Bulkhead with adapter, cable with potting, cable with globe, or
      something else.  Male on motor, female on motor?  Number of pins,
      amps-per-pin, total amps per connector?  And is that rating in
      water or air?

Jon





On 8/4/2014 5:36 AM, Cliff Redus via Personal_Submersibles wrote:

Been buried with work in Australia.  I have not had time to properly follow all the email traffic on this thread.  I hope to have some time to digest the thread when I get back home in about two weeks.  I did have a quick look at the Subconn HPBH4M four pin connector that can handle 50 amps per pin as well as the note Alan posted on using two of these pins for a thermistor for motor temp.  While it would be nice to have a motor temperature sensor (3 wire RTD would be better than thermistor), for me this four pin connector is  just too large and bulky for this application.  I feel like we are trying to make this connector work just because we have a discount with SubConn connectors.  I am not sure this is the best connector for this application.  There are a lot of commercial thrusters operating at this current rating at higher voltages than 36v that don't look anywhere near the size of this connector.  I think we need to do a little
 research and look what commercial thruster suppliers for ROVs are using for DC wet matable connectors.  We need more options.  I agree the cost for these SubConn connectors looks good but only if it works and makes sense.
>
>
>Trying to standardize a connector for these MK-101 is proving to be more of a challenge than I anticipated particularly given the motor is pressure compensated and the differential pressure across the connector is less than 5 psi.
>
>
>Alan, I did see one of your notes brining up the issue of how do make up this bulk head connector on the MK-101 lower unit.  I have not done so yet on the MK-101 I have but it looks from the drawing like it would be easy to pull the rotor assembly from the stator by removing two screws from the prop end of the unit.  I was planning on machining a bushing that would screw into the support boss on the thruster and screw the bulkhead fitting into this.  The drawing looks like it would be easy to push the bulkhead connector pigtails into this bushing, connect the wires to the existing wires by soldering and use shrink tubing to insulate and reassembly the MK-101.  Won't know until I pull one apart.  
>
>
>Has anyone disassembled a MK-101 lower unit? Is it as easy as it looks?  The wires connections on the MK 36V motor controller are just simple 1/4" spade connections.    I am wondering if they used the same spade connectors in the MK101 body?  
>
>
>BTY, these spade connections on the MK-36V motor controller don't look like they could handle 50 amps but MK has been using these successfully for a long time.  Go figure?
>
>
>Regards
>
>
>Cliff
>
>



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