Questions about the PCNS shutdown process

[rterreaux]

Hi,

I know that many have already opened a thread about this, but more I read, more I get confused.

I just would like to confirm a few points and ask questions about the configuration of NMC and PCNS.

I'm using a SMX1500RM2UC that has 3 outlet groups. 

I installed PCNS on each server connected to this UPS and set 600 seconds to the UPS on Battery: Enable Shutdown Event. 

in NMC, I set the power off delay to 800 seconds for each Outlet group 

I found this very interesting schema on What does the Force Negotiation setting achieve in the Network Management Card? - APC USA

Question 1:  

1) The utility power goes down, NMC detects an On battery Event. 

2) After 600 seconds, the PCNS asks the servers to run the command file if there is, wait for 70 additional seconds and then initiates a shutdown. 

This means that I need to make sure that the runtime available on the UPS is at the minimum: 600 seconds + 70 seconds + time for the servers to shut down. Am I correct?

Question 2: 

What triggers the UPS outlet group to turn off?   

Question 3: 

I understand that once PCNS has initiated the shutdown process, starting with the command file duration, there is no way to stop the shutdown. What happens if the utility power comes back after the UPS Group Outlet receives the command to turn off but before it has reached the end of the power off delay (800 seconds in my case)? Will it still wait for the power off delay to complete, turn off and then restart? Is that the purpose of the Reboot duration that I can see in the Outlet Group configuration?

Thank you for your help.