I’ve got a multiplus II plugged into cerbo gx mk2 with a touch50 connected. The multiplus ‘switch’ is in the on location.
If I plug in AC input (shore power, 120v 15 amp) the multiplus wakes up and everything works; including on/off from touch 50 panel. Then if I unplug shore power the multiplus stays on and the control panel will let me turn it off. But once it’s ‘off’ it won’t turn back on again. The ctrl panel lets me switch it to ‘on’ but the unit never actually comes on; until I plug in shore power again. very very odd.
Update: To anyone looking for a solution: I removed Pin 7 from the VE Bus cable and that allowed the system to work properly. Not my favorite solution; but a solution.
When a Cerbo, or some other GX device or DMC, is connected to the VE.Bus, then the physical switch is ignored.
Did you use both the Cerbo and the Mk3 at the same time? The Mk3 can emulate a DigitalMulticontrol, which would disable the Cerbo ability to remotely turn on/off the Multiplus. Not the exact same situation here, but could be related. To return to full functionality once the DMC was disconnected, you needed to rediscover the VE.Bus device on the Cerbo.
From watching the video, i suspect that the MP at first goes into standby for a few seconds, then fully powers down. Thats why you can enable it again for a short period. You can prevent it from fully powering down by removing Pin 7 of the VE.Bus cable, the MP will then listen to the physical switch again, but to me thats always been a patch for something that is an underlying issue somewhere. It will also use more power from the battery when permanently in standby compared to fully powered down.
AFAIK theres no final solution to this
If you are able, you can try to measure whether PIns 6 and 7 get pulled to GND once the Cerbo wants to switch on the MP. Pin 6 is standby, if its freefloating the MP will fully power down, if its pulled to GND it will stay in standby. Pin 7 is remote control connected, if its freefloating then theres no remote control, if its pulled to GND then there is.
The expected sequence is Pin 7 is always pulled to GND, as long as the Cerbo is connected and switched on, once you press “On” on the screen, Pin 6 should get pulled to GND, then the MP will change into standby, then the On command will be sent over the data lines from the Cerbo to the MP, once the MP has powered on, Pin 6 can be freefloating again.
Maybe your Cerbo has an issue with pulling Pin 6 to GND, or your cable has a fault on that specific conductor, or the MP itself
Thanks! It definitely seems to be that same issue as the other you posted. Looks like a few folks have run into it. I’m reluctant to cut pin 7 as I do need the ability to shutdown the MP to conserve energy; this is in a van conversion and power is limited.
Hoping to find out if others have found solutions with new Mk2 devices or perhaps reverting back to original cerbo gx devices until this is resolved.
