OK, this is a bit odd answering my own question, but for posterity sake and give back to this forum should someone else be trying to figure out power backup solutions with Tunze Pumps being controlled by their APEX, here goes. It will hopefully save someone else the hours of inconclusive research I tried to do on this and many other forums the last few weeks...
The short answer is, as soon as the Neptune module controlling the Tunze Pump (APEX Base or VDM -- whichever the pump control cable is plugged into) looses power, UNFORTUNATELY, the pump stops -- even if the pump has both normal power and battery backup via the 6105.500 Safety Connector operational. I'm bummed as this means the Tunze Safety Connectors will not work in an APEX controlled environment.
Of note: If one has an APEX plus a VDM, and you control your Tunze Pump via the VDM (opposed to the Base unit), and remove power and aquabus connectivity from the Base Unit while the VDM still has power another way, the Tunze Pump continues to operate and the Safety Connector automatic cutover works back-and-forth as designed. The Pump continues to operate even as power is reapplied to the APEX Base Unit and all the modules connect back up and continue their programming.
For those wondering how the physical Tunze connection works:
The single Tunze Pump cable (that comes up from the pump within your tank) goes to a built-in splitter box at the end of that cable, which in turn connects to both: A) Neptune splitter control cable into Base APEX or VDM -and- B) From 110V to the Tunze Power Adapter into that same splitter box.
If one installs the Tunze Safety Connector 6105.500, it's power line plugs into the splitter box (B above), and you then run your 110V to the Tunze Power Adapter to the Safety Connecter AND connect your backup battery (e.g. 12V source) into the Safety Connector as well. The Safety Connector normally drives the Tunze Power Adapter power to the pump, and when it senses that power is lost (e.g. a power outage), it automatically switches over and uses the backup battery (e.g. 12V source) if it's available.
In a non-APEX environment, one would have a Tunze Controller (e.g. 7095) plugged into the end of each pump cable splitter box (in lieu of the Neptune splitter cable). Interestingly, the Tunze Controllers do not have power cords of the own.
I wanted to plug 2 of my Tunze Pumps into a UPS that I have in place to keep power running for them and my APEX during a power outage (estimated 2 hr+ capacity for all 3 devices), then using the Tunze Safety Connectors, have another 12V battery that would keep a couple of my Tunze Pumps running for another day or so when my UPS is out of power including that to the APEX -- effectively like what seems to be possible with Vortec Pumps and the standard Ecotech Battery Backup solution.
In summary:
It appears that a non-APEX solution where the Tunze pump control signals are managed by a Tunze controller works as it should when one of the two power sources is lost to the Tunze Safety Connector, BUT... if you instead use an APEX like I am to provide the pump control signal, when the APEX or VDM looses power, the Tunze Pumps being controlled by that module shut down even if power to the pump itself is still available via the Tunze Safety Connector.
Given this constraint, I may well end up redesigning my power backup such that my UPS only serves power to the APEX and I immediately use my 12V batteries for pump power ... Not going through the AC-DC-AC conversion on my UPS will provide longer life to my pumps that way, and with only the APEX on the UPS, with some quick calculations, it should remain operational for 6+ hours. I don't know... I'll have to think about it and maybe purchase a Tunze controller to manually insert so my pumps can keep running if I get in a worst-case multi-hour power outage scenario. Shucks -- and I thought I had this all automated!!!
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