[TG] [TG11] EV1 takes vessel off course
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05-27-19, 02:06 AM
(This post was last modified: 05-27-19 02:13 AM by Tom - Raymarine - Moderator.)
Post: #3
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RE: [TG11] EV1 takes vessel off course
Hello ajhaddow,
I've read Jon's reply, and looked at the NMEA2000 data you've recorded and sent in. The relevant data that we see in the recordings includes:
Attached is an annotated plot of some of these values in over a period of around a minute from that log. It appears that the pilot is struggling to apply helm fast enough to correct the swing of the boat. This could be because there's a mechanical problem with the drive or its effect on the steering, or because the programmed hard-over time in the pilot doesn't match the real drive-unit hard-over time, so that the pilot's drive output is resulting in less rudder movement than the pilot thinks is the case. The Demanded Rudder looks reasonable, and I'd be confident that this isn't an electronic fault as these don't produce this sort of problem. It could be a mechanical fault. Some questions, then:
Most steering performance problems are a result of an unusually slow or fast drive-unit hard-over time, or a hard-over time setup that doesn't match the drive's real value, and these problems can cause problems like what I see in your log. Incidentally, re. your email - replacing the p70 will make no difference to this as it's purely a display/keyboard, it makes no course-keeping decisions. Similarly a *display* reset will have no effect, though a pilot (EV1) reset or Compass Restart would. After a compass restart, the EV1 will recalibrate as long as you're under way at >3 & <15 knots, and turning. Regards, Tom Raymarine since 1999. Interests: Diagnosis of problems in sonar/fishfinders, NMEA2000, ethernet comms, autopilots, thermal cameras Location: Sydney, Australia. Please don't PM me asking for direct support, please ask a public question instead so that others can see the question and answer. Forum posts will always be answered before PM requests. |
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[TG11] EV1 takes vessel off course - ajhaddow - 05-19-19, 06:12 AM
RE: [TG11] EV1 takes vessel off course - Tom - Raymarine - Moderator - 05-26-19, 10:10 PM
RE: [TG11] EV1 takes vessel off course - Tom - Raymarine - Moderator - 05-27-19 02:06 AM
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