Chapter 3. DIRECT AND GENERAL SUPPORT MAINTENANCE INSTRUCTIONS

TM 11-6130-385-34

CHAPTER 3

DIRECT AND GENERAL SUPPORT MAINTENANCE INSTRUCTIONS

Section 1. GENERAL

Figure FO-6. Power Switch PCB Schematic

3-1. Description

Diagram (A7)

The inverter converts a nominal +28 vdc input to a

Figure FO-7. Interconnection Diagram

regulated 115-vac, 400 ±7 Hz, 3-phase output

shows all the wiring required for connecting the

through use of a pulse-width modulation technique.

modules within the Inverter.

This static inverter is a solid state design and em-

ploys no moving parts except for an internal cooling

3-3. Numbering System Used in Design of Inverter

fan.

For the sake of clarity, the following numbering

3-2. Block Diagram and Schematic Diagrams

system is used. Discrete components on major

module A1 are given a three digit number, for

Figure FO-1 shows the sequential operation of the

example R101, indicating R1 of major module Al

unit, the signal frequencies, waveforms, and test

(for A1R1 ). The next resistor on the A1 major

points. The schematic diagrams of the individual

module would be R102 (for A1R2). For major module

printed circuit boards are shown on the following

A2 the first resistor is R201 (for A2R1), etc.

figures:

Figure FO-2. Oscillator PCB Schematic

3-4. Continuity Tests

Diagram (Al)

For continuity tests, refer to the following tables:

Figure FO-3. AØ Modulator PCB Schematic

a. Table 3-1. Main Harness Wiring Data.

Diagram (A2)

b. Table 3-2. Power Switch Wiring Data.

Figure FO-4. BØ , C Ø Modulator PCB

c. Table 3-3. Power Transformer to Filter Wiring

Schematic Diagram (A3)

Data.

Figure FO-5. Dc Voltage Regulator PCB

d. Table 3-4. Power Harness Wiring Data.

Schematic Diagram (A4)

Table 3-1. Main Harness Wiring Data

Change

3-1