Z-4000 Discovery

I don't have Z-4000 but be careful, the pin on the  TIUs aux power supply is common to the black connectors , not hot as one might think. Dead short if you get it backwards.

If you look closely at the Z4000 you'll find that each of the four outputs has its own resettable circuit breaker.  The accessory power comes on with the Z4000's master power rocker switch.  I've been using the 14v to power the TIU since two days before the DCS release.  As Gregg said, the center of the Aux Pwr plug must be connected to the black terminal.

With the 14v fixed 3 amp accessory, you should be able to run at least 2 TIU and possibly 3.

Another big advantage of powering the TIU with the 14 VAC output is when you use the E stop button it automatically cycles the TIU off and on when you power off and repower the Z-4000.

Rod