ECUmaster PMU-24 DL project question

Hello,

Zac's course examples of PMU installation have been helpful. I'm in process of a complete re-wire of a Lotus Esprit LS-3 conversion using a Holley Dominator ECU and ECUmaster PMU-24 DL. Sticking fairly close to Zac's methodology, the stock keyed ignition switch will turn on the PDM, which in turn will power up the ECU by default or through an Enable button on the PMU CANbus keyboard. Ideally I would like to have a timer that runs the electric water pump and rad fan(s) for a few minutes after the motor is turned off at the mechanical key. Any suggestions on how to keep the PMU alive for these minutes to time this function after the key is switched off? Other approaches are welcome.

Thanks,

Dave

Ecumaster added a delayed turn off feature, it's in version 56 and newer. So long as the main stud has 12V power

Typically I wire the PDM's turn on with permanent power off either a fuse from the main stud or an output from a battery isolator. Then the ignition key is just an input into the PDM. The PMU's are actually really low amp draw when idle, I have not had battery drain issues with them compared to other PDM's.

Teeson, wiring like that would keep the PDM always on, and when the ign sw is turned on, it activates the outputs?

Instructions for how to set up delayed shut down are here:

https://community.ecumaster.com/t/pmu-delayed-power-off/594

What I've done is set up an "or" fuction for the cooling fans so they'll either work off the ecus pwm commands (coming in over CAN) or will run if "pmuisshuttingdown" function is active and ect is above 70degs. You could set the same logic up for a water pump.

Teeson, wiring like that would keep the PDM always on, and when the ign sw is turned on, it activates the outputs?

Yes, have the ign switch as an analogue input. You can set the logic for things like the head lights or hazards to operate independent of the ign key being on this way. I also do the acc key position and program it to be like an OEM vehicle.