Garmin GHC 20 Setup Troubles

Canyondiver

Lieutenant Commander
Joined
Dec 6, 2020
Posts
206
Likes
96
First Name
John
Howdy DEBF folks!

Trying to get the GHC 20 working with a solenoid based, 3 station Hydro Slave system.

Steers fine manually at each station, but the Garmin is basically doing crap.

See image of quadrant for clarification.

This is on the 45 Young Brothers.

Yesterday, during Setup Wizard, it failed out of the Zig Zag sequence repeatedly.

5 deg port, 10 deg starboard, 5 port and 15 starboard, making a circle instead.

Any thoughts or information are greatly appreciated.

Thank you

322EE052-A57B-4A30-8E20-9CCABD556707.jpeg
 

Canyondiver

Lieutenant Commander
Joined
Dec 6, 2020
Posts
206
Likes
96
First Name
John
Which Garmin GHP/Reactor version is it; is it the 'Mechanical/Retrofit/Solenoid Corepack"?
Thank you for the reply!

GHP 12 ECU, Reactor 40 heading sensor, and it is the Corepack.

Solenoid was in the boat and is Japanese, very simple, double ended valve to divert flow to one piston or the other.

I can climb into the engine room if you’d like a pic of the device.
 

Wharf Rat

Marine Electronics 'Professional'
Forum Sponsor
Joined
Apr 24, 2012
Posts
984
Likes
742
Location
City Island, NY
Website
www.precisionmarinecenter.com
Boat Make
OPB
Do you have an flow adjustment valve for that solenoid? If it's too high or low, the pilot will go nuts. With the solenoid engaged, you're looking for a hard-over time of 10 seconds, maximum of 12 seconds.
 

Canyondiver

Lieutenant Commander
Joined
Dec 6, 2020
Posts
206
Likes
96
First Name
John
From my understanding, the tech opened it up all the way, which is my suspicion of system really freaking out.

Somebody said less pressure, more flow when opened.

is this correct?

Will adjust mid way, and begin there.

Any thoughts on rudder gain and counter gain settings to begin with.

craft has a barn door rudder of roughly 3x4’.

Thank you!
 

RCLS2016

Commander
Joined
Jan 11, 2016
Posts
289
Likes
148
Location
NJ
Boat Make
26 SISU
Canyon diver,
Chris is definitely your best resource on here in my opinion,, so +1 on what he said. I just also wanted to add... Of the one Garmin AP I installed and 3 others I did service calls on to commission, I was never able to get the auto tune to complete properly. I only had luck with doing it manually. Slow circle for compass calibration and adjusting the gain as well each time until it would pass... Edit, it also looks like you may want to check the rudder feedback.. Tough to tell but is there enough "Throw" where it is mounted?
 
Last edited:

Geof Roberts

Lieutenant
Joined
Jan 14, 2020
Posts
23
Likes
10
Age
74
It may be parrallex error when the photo was taken, but when the rudder is midships the arm on the feedback sensor on the right of the photo must present a a 90 deg...angle...otherwise you will not get a linear response...
 

Canyondiver

Lieutenant Commander
Joined
Dec 6, 2020
Posts
206
Likes
96
First Name
John
Thank you everyone!
Will begin with repositioning the RFD.

That explains the circles during the Zig Zag sequence.

Then try all your suggestions to get her up and working.

Hydroslave suggests we need a full replacement due to a bad piston seal.

However, steering is 3.5 turns either side to lock.
 
Top Bottom