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Old 05-13-2007, 07:19 AM   #1
jlr
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Default Simrad - expert advice needed

I have been having a current overload, rudder response failure error with my AP 22 pilot. The boat is used but new to me. In checking out the pump, it appears to be an rpu 160 pump which is the correct size for the boat. Howver, the junction box is a J 3000x, which I undersand is a mismatch with that pump. So, it appears my options are to replace the pump with rpu 80 (which is too small for the boat) or the junction box with a J 300 x, which will cost about $1,200. Is there any way to rig this junction box with this pump to make it work or is a new junction box my only choice. The current overload failures only happen when quick movement is called for by the pilot, not on the usual small movements needed in the nav mode in calm seas. Any creative ideas would be appreciated.
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Old 05-13-2007, 07:52 AM   #2
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Default RE: Simrad - expert advice needed

That is a very odd situation since it suggest the original installer used a junction box that was incompatible with the pump from the minute it was connected. Are you sure that the RP80 is unable to drive your steering? Did you check the volume? I am wondering if there was a pump failure and the owner replaced an RP80 with the RP160 thinking bigger is better.

In the meantime, if I recall correctly you can go into the settings and limit the response. I have an AP27 now but I think I remember that the AP22 has the same parameter menu. If you limit the rudder movement by the setting, you may keep the load below the level that is triggering the failure. Not ideal and it may affect the performance a bit at lower speeds, but it might solve your problem with the overloads.


Also if you have not done so, you should contact Simrad customer service. At least before the buyout, they were very helpful and gave good tech advice. There may be a fix short of replacing the junction box.
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Old 05-13-2007, 08:01 AM   #3
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Default RE: Simrad - expert advice needed

I will touch base with them on Monday. Not sure what the PO did here. I suspect given the size (43 feet and weight 35,000 pounds), an rpu 80 is too small. I suspect they have replaced the j 300x with the J 3000 x becuase it is much cheaper. I can swap in a new junction box easilly but it is quite expensive. I wonder whether Simrad can tell me how to make my 3000x (which can only handle 6 amps continuous) into a 300 x rated at 10 amps continuous. The pain is that right now, I can't really tell whether the pump is peforming properly either, since even with a properly performing pump, the 160 is a mismatch with the 3000x. Once again, even with the mismatch, it works fine in calm seas. I do need to get it working properly as I have too much invested not to.
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Old 05-13-2007, 08:42 AM   #4
jlr
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Default RE: Simrad - expert advice needed

Would a simple relay work for this problem. Say, the signal to the pump goes to the part of the relay that energizes the coil and a haevy line capable of handling 20-25 amps goes to the no and to the pump parts of the relay-from a suitable sized breaker or with a suitable size fuse? It sounds like it should work but feedback would be appreciated.
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Old 05-13-2007, 08:48 AM   #5
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Default RE: Simrad - expert advice needed

First of all the size of your boat has very little to do with the size of the pump. Pump size is based on cubic inch displacement of your steering ram.
If it is over 13 cu. in. then you better stay with the RPU160.

If I remember correctly there are 2 PCB's in the junction box and only one (power supply side) might need to be changed.
Contact Simrad before you do anything else.
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Old 05-13-2007, 10:04 AM   #6
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Default Re: Simrad - expert advice needed

jlr- I dont think a relay would work since the controller probably uses variable speed control to jog the motor.
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Old 05-13-2007, 10:50 AM   #7
jlr
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Default Re: Simrad - expert advice needed

I jus found out that the junction box reverses polarity depending on which way the rudder needs to be turned. Thus, an external relay will likely not work. I'll double-check with Simrad on Monday and see what they can come up with. Since I believe that the only issue will be the power demand, perhaps a simple change as Craven suggest is in order. By the way, the Simrad website sizes the pump based on the size of the boat, which in turn, I am sure, is sized to the size of the ram.
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Old 05-13-2007, 07:16 PM   #8
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Default Re: Simrad - expert advice needed

Call Tom Thorsvig - Product Support Supervisor
Simrad Inc.
19210 33rd Ave W, Suite B
Lynnwood, WA 98036
Phone 425-778-8821
800-426-5565
Fax 425-712-1177

I just installed an AP-14 and he was a tremendous help. Outstanding customer service!
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