Use and Care Manual

1-1

1. Introduction

ABOUT THIS MANUAL

This manual covers transfer switch models pro-

duced under the Cummins

Power Generation

brand name. This manual provides information nec-

essary for operation of an RSS transfer switch with

a control.

The RSS transfer switch with a control includes an

operator panel located behind the hinged panel in

the upper left hand corner on the front of the enclo-

sure, as shown in Figure 1-1.

THE OPERATOR

PANEL IS LOCATED

BEHIND THE

HINGED COVER

FIGURE 1-1. RSS TRANSFER SWITCH

TRANSFER SWITCH FUNCTION

Transfer switches are an essential part of a standby

power system. The utility (normal power source) is

backed up by a generator (emergency power

source). Should the utility fail, the transfer switch

automatically switches the electrical load from the

utility to the generator. When utility power returns,

the transfer switch automatically switches the elec-

trical load back to the utility.

Automatic transfer switches, capable of automatic

operation without operator intervention, perform the

basic function of transferring the load to the avail-

able power source. A controller monitors each

source for allowable voltage and frequency range.

The transfer switch performs the following func-

tions:

1. Senses the interruption of utility power.

2. Sends a start signal to the generator.

3. Senses generator power is available.

4. Transfers the load to the generator.

5. Senses the return of utility power.

6. Retransfers the load to the utility.

7. Sends a stop signal to the generator.