Chapter 7 | Understanding UPS Operation |
AC Input to Rectifier/ Charger
The Powerware 9315 is a continuous duty, solid‐state UPS that supports the following equipment: process control, data processing, telecommunications/PBX, research, and medical. The Powerware 9315 maintains power to the critical loads during commercial electrical power brownout, blackout, overvoltage, undervoltage, and out‐of‐tolerance frequency conditions.
In this manual, the power required by your equipment is called the critical load. The UPS supplies the critical load with conditioned power that is synchronized with your utility power. Figure 7‐1 shows the main elements of the UPS system.
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| Battery String |
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| Battery |
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| Breaker |
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| CB2 |
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Input/Rectifier | F30 |
| Output/Inverter |
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| F31 |
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Input |
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| Output |
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Transformer |
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| Transformer |
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| AC Output |
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| to Critical |
Input |
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| Output | Load |
Breaker | Rectifier/ | Inverter | Breaker |
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CB1 | CB3 |
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Charger |
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| Power |
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| Processing Unit |
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Input |
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Filter | Digital |
| Filter |
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| Metering |
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AC Input to Bypass
Backfeed
Protection
Breaker FBP
Static
Switch
Bypass
Breaker
CB4
Module Bypass Cabinet (MBC)
Figure 7‐1. Main Elements of the UPS System
The emergency bypass consists of a static switch, a wraparound bypass breaker (CB4) and a Backfeed Protection Breaker (FBP). The FBP is located in series with the static switch and opens so that the UPS cannot backfeed the bypass source.
For manual transfers to bypass, the static switch is not used. During the transfer, CB4 is closed and verified and then inverter output breaker CB3 is opened. For transfers of the load from bypass to the UPS, CB3 is closed and verified and then CB4 is opened. The static switch is armed and ready during both types of transfers.
EATON Powerware® 9315 UPS |
