Recommendations for Timing Shutdowns

APC recommends the following procedures to configure delay times accurately and ensure orderly shutdown.

Recommendation
Notes
Perform a runtime calibration monthly to ensure accuracy of the reported runtime.

Note
For a Back-UPS, you cannot perform runtime calibration

Perform runtime calibration when the UPS is supporting its usual load. Do not unplug equipment normally plugged into the UPS.
To calculate and configure the time necessary for a shutdown-related command file to run, perform the following steps.
  1. Record the time necessary for the command file to execute under normal load conditions.
  2. Add the delay time set for the Run Command File action to the time you just recorded.
  3. Specify this total time as the shutdown delay time for the System Shutdown Starting event.
See Overview of Available Actions for Events
If your system is complex, and the UPS Turn Off Delay is lower than the maximum value of 180 seconds, check your shutdown script to determine what shutdown-related tasks occur after the delay begins.

Then time those tasks during a manual shutdown to determine whether to increase your delay.

See the Installation Guide: PowerChute plus for UNIX for the name of the shutdown file (script) that PowerChute plus modifies or creates on each supported UNIX platform.