Figure 2-14. Solid state uninterruptible power system, simplified block diagram.

TM 11-5895-1012-10

gency signal lights, test equipment, etc. These bat-

equipment Usually, these units have only one set

teries are available in various sizes and shapes and in

field coils and each set of armature windings is con

several capacities and voltages to accommodate a wide

nected to its own commutator. Essentially, dyna

range of uses. Special purposes dry batteries of higher

motors are motor-generators in which the motor and

than normal quality are also available for certain ap-

generator windings are wound in the same slot and on

plications.

a single common armature.

c. Rectifiers. With an ac power source, rectifiers in

e. Frequency Changers.

conjunction with appropriate transformers and filters

(1) Frequency changers are motor-generator sets

yield dc power with very little ripple content. Two

that convert ac of one voltage and frequency to ac of

common types of rectifiers are those that use electron

another voltage and frequency. Frequency changers

tubes and those that use semi-conductors of the disk

are used in DCS Stations to convert the incoming as

type (selenium, silicon, and germanium) as the rectify-

frequency and voltage to match the input power re

ing medium. Some rectifiers are designed as part of a

quirements of certain items of DCS equipment.

specific equipment and some of these cannot be used in

(2) The motor-generator sets, depending on the

other applications. However, many general purpose

application, may be driven by either a single or mull

rectifiers are available. In efficiency, rectifier output is

phase induction or synchronous type motor. The driv-

ing motor is usually coupled directly to the generator

usually from 60 to 70 percent of the input power.

by a common shaft with both machines mounted on

d. Dynamotors. Dynamotors are rotating machines

the same bedplate.

used to convert dc voltage of one value to dc voltage of

another value and usually are components of specific

Section IV. REPRESENTATIVE TCF EQUIPMENT

2-30. General

will discuss the conditioning equipment found in the

introduction of high-speed data

TCF and those other items of equipment which are re-

quired to insure circuit performance and to enable the

transmission into the DCS, the term "circuit condition-

Technical Controllers to perform the function of the

ing" was little used in Technical Control Facilities. As

TCF.

higher speed data circuits came into wider usage, the

b. Ideally, all transmission systems and the chan-

term became increasingly familiar to technical control-

nels of these systems should preserve the fidelity an

lers, especially as it applied to circuits obtained from

amplitude of the original information. However, it is

recognized that in a practical communications system

the information carried over any transmission media

is subject to certain electrical characteristic changes

have an understanding of the requirements for circuit

which result in loss, delay, or distortion of the trans-

conditioning and technical information on the equip-

mitted information. Even though systems are properly

ment required fop circuit conditioning. This section

2-34