What should the alarm in the GX indicate?
that the pump is running or a water level
and …
You definitely need a relay … the relays in the GX cannot switch a load such as a larger bilge pump … up to 30V and 6A would be possible
technical data of the bilge pump ?
I would still use a relay even if it would be enough. Switching a motor many times always damages a relay in the long run …
Thanks and answers
alarm ---- pump is running
Whale bilge pump (incl. vlotter) ----- 12 V, 5 Ampere – then I need a relay ? suggestion?
When I decided to use a bilge pump and a free vlotter then I need a relay for two devices to two relay connections cerbo gx
Has anyone tackled this? I assume we would need some sort of optoisolator with a 3v output. Is there a plug and play version available?
For a bilge pump run alarm, we connect the output of the manual bilge pump switch (the auto setting through the float switch makes this live) to a relay, terminal 86. the relay terminals 30 and 87 are connected directly to the cerbo digital inputs, basically joining the inputs together when the bilge pump runs.
As there are only four digital inputs on a cerbo, we normally use diodes to connect all the bilge pumps to one input. the other three digital inputs are used for high water alarms.
I hooked up a set of relays I had lying around and I’m more confused now…
85 is connected to the bilge pump +
86 is wired for ground
30 is wired to the Cerbo input signal
87 is wired to the Cerbo input ground,
BUT the relay closes when testing without 86 actually grounded… How is my relay firing with only a 12v + input and no - connection to complete the circuit? My only thought is that it’s grounding thru the Cerbo but there shouldn’t be a connection between the coil and load circuits.
