SECTION Il. EQUIPMENT DESCRIPTION - TM-11-6130-429-400010

TM 11-6130-429-40

SECTION

Il.

EQUIPMENT

DESCRIPTION

1-9. Equipment Characteristics, Capabilities,

Length

44.45 cm (17.50 in.)

and Features

Width

12.4 cm (4.88 in.)

Height

17.78 cm (7.0 in.)

a. Purpose of Converter:

Environmental

Conditions:

Supplies regulated DC voltage to equipment

Ambient

temperature

-70

F(-57C)

+125F

used in AN/TTC-38(V) and AN/TYC-39(V)

(+52C)

Relative

Humidity

98%

t e l e p h o n e switching systems.

Altitude

25,000

feet

(7,500

meters)

b. Capabilities and Features:

above sea level

External shutdown capability, from equip

Technical

characteristics

ment or control panel converter supplies.

Output

voltages

+5V

direct

current

Automatic shutdown in the event of overload

+75 amperes

Output current

Nominal power

375

watts

o r underload conditions.

Operating

power

require-

Emergency

voltage

adjustment.

ments

21-30 volts direct current

Test points for monitoring output circuits.

of full load

Regulation-Peak-to-Peak

0 to 10%

Ripple and Noise

10% to full load 2%

1-10. Location and Description of Major

1-12. Safety, Care and Handling

Components

All major components of the converter are located on

Observe all WARNINGS, CAUTIONS, and NOTES

the front and rear panels, and inside the main chassis

i n this manual. This equipment can be extremely

assembly.

dangerous if these instructions are not followed.

1-11. Equipment Data

Weight

and

Dimensions:

Rack

Mounted:

Weight

11.350 Kg (25 lbs. approximate)

SECTION

III.

TECHNICAL

PRINCIPLES

OPERATION

1-13. Block Diagram Description

tion between input and output. The output voltage is

(fig. 1-2)

m o n i t o r e d by the control circuits which, in turn, ad-

just the pulse width (duty cycle) of the 20 kHz

a. Two connectors (P1 and P2) are provided for

switching regulator automatically so that the output

dual input and output connections. The outputs are

voltage is maintained independent of the input line or

interconnected to the loads through isolation diodes

o u t p u t load conditions.

which enable two or more converters to be used in

c. The input EMI filter prevents electromagnetic

redundancy. If one converter fails, the standby con-

i n t e r f e r e n c e s generated in the switching converter

v e r t e r will automatically take over without voltage

from reaching the input DC line and similarly pre-

i n t e r r u p t i o n (glitching) at the load. Two converters

v e n t s electromagnetic interference on the DC line

m a y be used to supply a single load or three con-

from reaching the regulated output voltage. The unit

verters may be used to supply two independent

is also protected against damage if a reverse input

loads. In this case, the third converter stands by and

voltage is applied by a large reverse rectifier directly

w i l l take over if either of the two converters fail.

across the bus. The capacity of this rectifier is suffic-

I n p u t voltage may vary between 21 and 30V with

ient to trip the system circuit breaker without dam-

transients.

age to the converter.

b. The converter contains a 20 kHz pulse width

m o d u l a t e d DC-DC converter with transformer isola-

1-2