Eaton POWERWARE 9315 Instruction Manual download pdf (Page 46)

7−2

EATON Powerware 9315 Parallel Capacity/Redundant System

164201150 Rev. E www.powerware.com

During maintenance, the output of the system can be supplied power through the

bypass breakers in the SBM or the optional System Maintenance Bypass (SMB).

The bypass input and breaker must be rated for the total system load since it must

supply all of the system load when on bypass. Manual transfers between the

bypass source and the paralleled UPMs are verified make before break.

For manual transfers to bypass, the static switch is not used. During the transfer,

CBP is closed and verified and then CBS is opened. For transfers of the load from

bypass to the UPMs, CBS is closed and verified and then CBP is opened. The

static switch is armed and ready during both types of transfers.

Communications is required between the SBM and UPMs in the system for full

system operation. System level communications and control are accomplished

using a dual redundant network known as PowerNet. PowerNet consist of two

independent networks that are connected to each component network node in the

parallel system.

Data is always transmitted on both networks simultaneously. Each network node

monitors both PowerNets. Failure of one of the two will only result in an alarm

condition. In addition, the applications at each node are designed such that

messages can be lost on the network without affecting the operation of the system.

7.2 Normal, Battery, and Bypass Modes with Parallel

Operation:

With the Parallel Capacity/Redundant system, the system continues to function

automatically to supply AC electrical power to the critical load. There are three

standard operation modes and one optional mode in this system:

• In Normal mode, the Parallel Capacity/Redundant system functions normally,

suppling clean, filtered power from the UPMs to the load.

• In Bypass mode, the SBM bypass input supplies the load and isolates the

UPMs.

• In Battery mode, the battery cabinet supplies DC power, which maintains UPM

operation.

• In Maintenance Bypass mode (optional), the SMB bypass supplies the load and

isolates the SBM and UPMs for maintenance purposes.

The following descriptions provide the Parallel Capacity/Redundant system

operating mode differences.

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Eaton POWERWARE 9315 Instruction Manual Page 46