[PSUBS-MAILIST] MK-101 Connectors

[Jon Wallace via Personal_Submersibles]

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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