User Manual

Chapter 1 - General Description

Network Power Switch

1 Chapter 1 – General description

1.1 Introduction

The Network Power Switch is an automatic static transfer switch designed to provide fast automatic transfers between two independent, synchronous AC power sources to provide continuity of AC power to critical equipment, such as information technology equipment.

One of the two AC inputs is designed as the “preferred” source to which the Network Power Switch will connect the load as long as the designated input source is within the acceptable limits, the Network Power Switch is designed to transfer the output load to the “alternate “input source, as long as the alternate source is within the acceptable voltage limits.

The Network Power Switch provides fast, break-before-make transfers to prevent interconnection of the two sources, even under faulted source conditions.

The maximum sense and transfer times are within the tolerance of IEEE Standard 446 susceptibility curve for information technology equipment to allow uninterrupted load equipment operation.

In case of overload, Network Power Switch gives the alarm. Under Short-circuit condition a fast acting semi conductor fuse protects condition of the load.

Manual Bypass Switch

The entire power static switch module is hot swappable. Before removing this module the load is transferred, without break to any one of the source directly by using the Manual bypass switch. After replacing the static switch module, the load is restored on static switch module, using the Manual bypass switch.

Block Diagram

L1

L2

N1

N2

L1 BYP.

STATIC

SWITCH

L2 BYP.

NEUTRAL

MAN. BYP. SW

L

OUTPUT

N

NETWORK POWER SWITCH

Fig 1.1 – Block Diagram of Network Power Switch

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Liebert 110V manual General description, Introduction