NUT Client configuration -> help needed for shutdown Proxmox host

Hello Together.

I hope you can help me?

I meet the following requirements:

- Synology DS918+ as NUT Server
- Proxmox host as NUT Client
- APC 1000 with USB connection to Synology DS918+

What works?

- the connection between DS918+ and Proxmox host is established and works
- sending emails from Proxmox host, when NUT connection is lost, established, on batt or online again

What doesn't works?

I want to shut down Proxmox host with "upsmon -c fsd" after 180 seconds after change to ONBATT...

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