Monday, March 12, 2012

Project ST5000: It's alive!

The lashup
It works!  I can control the drive from the ST5000+!  Here's the lashup I have been using to test this.

I have commandeered the wiring that would normally go to the old Benmar controller in the cockpit to carry the power to the ST5000, and to carry clutch actuation and drive signals from the ST5000 back to the drive, using the same wires that carried those functions with the Benmar controller.   It's that fat grey wire going to the ST5000.  By doing so, I eliminate the need to run a new wire.

I have to have the compass hooked up in order to get the ST5000 to run; that's it on the step above the ST5000.  But I do not have the rudder sensor hooked up, so the autopilot will eventually alarm that it cannot see rudder movement, and fall back to standby mode.

Nevertheless, when I turn the compass, the ST5000 will drive the motor back and forth, appropriately, pulse-width modulated, and the limit switches in the drive stop movement when they should.  It's all good.

Here's a closeup of the wiring.  This will get cleaned up, with the SSR's mounted to the inside of the cast aluminum cover.  A new terminal strip was required to mount the diodes in the control lines - it's black - you can see it hanging loose there, inside the drive case.

This completes what I originally called Trial install #1.

I will write up the wiring changes required inside the drive (very few, other than the required removal of the original mechanical relays), and provide a detailed schematic.  Both are partially complete right now.


1 comment:

Anonymous said...

Looking good - I can't wait for the schematic. Will you include the details for the components? I might put an order in for the relays soon.

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