Introduction
1.0INTRODUCTION
1.1System Description
The role of the
If there is an outage of the source power, the UPS maintains power to the load until an alternate source of power is activated or until the original power source is restored. If input AC power is not restored, the UPS maintains the load (with a storage battery plant) long enough that the critical equipment can be shut down in an orderly manner or an alternate power source (e.g., Genset) can be brought on line. The Series 610 UPS module displays the rate of battery discharge and calculates the amount of battery time remaining based on the actual connected load. The time that the battery will maintain the load depends on the capacity of the battery backup plant and the size of the load.
The system control logic automatically manages critical bus operation. System logic is resident in dig- ital control logic for precise control and improved reliability.
If the critical load current exceeds the rated load of the Series 610 UPS system, the control logic deter- mines the magnitude of the overload and reacts appropriately. Overloads are usually the result of inrush current requirements. The UPS system supports loads that are 150% of the rated load for up to 30 seconds and 125% of the rated load for up to 10 minutes. If the system is operating in the non- redundant mode (e.g., a UPS module is off line), the overload limits are automatically adjusted.
Figure 1 |
If the load surpasses the overload capacity of the UPS, the load is automatically transferred to bypass without interruption. When the load returns to within the UPS rating, it is either automatically or manually returned (retransferred) to the UPS. How and when the load is returned to the UPS depends on several factors: how long the overload lasted, how many overload conditions occurred before transfer, whether there is an imminent failure of any part of the UPS, etc. Refer to 3.5 - Auto- matic Operations.
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