I am after some advice
on how to track down a fault on my raymarine
realvision RV200 transducers that basically looks like noise
(see picture) when viewed on a Raymarine
Axiom Pro 9". The issue seems to be worst in sonar/fish finder mode - not so apparent in side vision or down vision.
Here is the background and what I have done so far:
is present whenever the key is switch to the ACC position, regardless of whether or not the engine
is running - although it is worse when the engine
is running, and seems worse in deeper water
is on a fiberglass
yacht. We have two battery
banks (start and house) and two alternators (start and house). The ground on the boat
is the engine.
So when the key is switch to ACC the noise is present. Only 3 things are connected to ACC, engine alarms, panel lights and power to a Balmar
(for house alt). By disconnecting each of these wires one at a time I have isolated the issue to being caused by the balmar
I have also removed the cable from the sonar to plotter and re-routed it away from all other cables
. That made no difference whatsoever so I think this is an electrical
issue more than a EMI issue.
A few other folks have suggested to check ground connections for both the sonar and the Balmar reg. I have checked the ground for the Balmar reg and it runs to the negative post of the alternator
- there is good continuity without any resistance between them. There is also good continutity from the negative post of the alternator to the engine body.
So this leaves me to look at the ground for the sonar - which is via the chart plotter itself.
When the plotter was installed the ground and batt negative wires were joined and both go to the negative busbar. I also note that the body of the chart plotter has a external ground connection which the manual describes as option, and I presume is a seperate ground just for the case of the plotter?
Beyond these steps - I am unsure what to try next?
The plotter has been installed for a few years and been working well up until recently. Note the bottom picture was with the motor
off - you can still see the noise - but it gets considerably worse with motor
on - as you can see from top pictures.