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Date: 02/25/03 at 1:09 PM
Posted by: DInkar hahali
E-mail: dinkar2000m@rediffmail.com
Message Posted:

APC Silcon Delta Conversion UPS Never Ending Problems.

APC Silcon 10 KVA UPS we procured in Year 2000 at our office facility new mumbai as we impressed about features & benefits reffered by supplier till date we suffered a lot.
Probably consultant will not tell you these. For critical applications you have to buy Double conversion online systems.
I can only say be fully awake about the subject and if you decide to purchase a unit you have right to know about above subjects.
Impressed by APC Silcon Delta Conversion On-Line Innovations, which is not infact.
1. Full rated output available in KW
2. Extendable Run Time
3. Save on electric cabling
4. Reduced Generator Sizing Required
5. Superior Output Overload
6. Software for graceful Shutdown of Operating Systems
7. Fully Rated Output Inverter
8. Excellent Frequency Tolerance
9. Service
On this basis we procured APC Silcon 10 kva/kw ups, 17 kva (13.6 kva) Generator only for only UPS
Crisis starts with Installation
Managing 3 phase output for call center 35 desktops & 3 servers is Jugglery & very difficult, each phase load should not be more than 33% kva is impossible. Full rated inverter can not support for 10 KW pc load as it is not linier load. It means it is designed for motors so this is equal to normal ups.
Subsequently found that if balance is not maintain natural imbalance increase soon natural cable oversized by 200% in mains unsynch mode in this 200% overload condition also donít stand
Next problem of variation in voltage & frequency at output of ups after setting frequency at 50 hz.. Soon after this setting found battery discharging problems started. Although power available ups used to trip output & indicate battery low, And when essential on power cut battery pack of 30 minutes supported for less than 5 minutes even generator could not took over load
After many meetings & discussion with Consultant/Supplier on battery discharging problem only solution was available that, if output frequency should not be control.
(output frequency will very between 47 to 53 Hz.)
Battery backup failed after 7 month of installation, Battery failure report indicates that undercharge of battery& Charging DC ripple problem. Ripple is more than 5% as Input natural is connected to directly mains leakage voltage damaged battery life
As per battery report found two more problems of natural floating in output around 7v. This also connects to battery. As Silcon UPS designed is without Isolation transformer, natural floating voltage external Isolation transformer, we paid additional cost/space. Next problem about DG compatibility when ups switched to bypass for servicing DG failed to support as the sizing witch was calculated by solution with was not consider for maintenance this ups solution consequence as 528 hours down time in year & unanswered battery & frequency Problems
Now currently we are using 3 kva double conversion online ups for servers & new set of battery for APC silcon

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