Issue
How long can the power to AS be interrupted
Product Line
EcoStruxure Building Operation
Environment
- PS Power Supply
- Automation Server
Cause
Question regarding the AS and the power supply module. If the power is interrupted from the 24VAC power supply for say, 100 milliseconds, will the power to the AS be interrupted?
There is a cold cap in the PS, and how long does it maintain power supplied to the AS? What about the RTC?
Resolution
The power to the AS will be interrupted if there is a 100mS main power fail. The AS will then save the server cache. When the power returns the AS will make a restart that will take approx. 2 minutes.
The AS Power supply fully complies with the IEC 61000-4-11 standard and can withstand voltage dips, with a 20mS dip and a 0% residual voltage.
The Power-fail process:
When the AS loses power the super-cap keeps the AS alive for 15 seconds. 10 seconds of it dedicated to power-fail process to flush all the data that that are currently in the RAM to the SD card(That data can be anything with any value they have before power-fail). When power comes back that data is retained and are stored in appropriate place on the SD card.
Real-Time-Clock(RTC) is maintained when the AS loses power by a dedicated capacitor which backs up the RTC chip for a minimum of 30 days in the absence of power since there is no battery in the AS.
