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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.<br>
<br>
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?<br>
<br>
Jon<br>
<br>
<br>
On 8/4/2014 5:36 AM, Cliff Redus via Personal_Submersibles wrote:<br>
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<div>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.</div>
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<div>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.</div>
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<div>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. </div>
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<div>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? </div>
<div><br>
</div>
<div>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?</div>
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<br>
Regards</div>
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