Figure 5-4. Transformer details.

TM 3-4240-201-13

b. Function. The function of the transformer is

the secondary winding output is 30 volts. The relay is a

double pole double throw relay that operates on 115 volts

shown in figure 1-6. When the toggle switch is turned

600 Hz ac. The toggle switch is a three pole single throw

on, the 115 volt ac power flows through the primary

switch. The three power cables are two conductor

winding of the transformer (10, fig. 5-4) and through the

rubber covered cables. Two power cables are 3 feet

armature of the relay (5), energizing the relay. The

long and the other is 6 feet long. The 115 volt ac power

secondary winding of the step down power transformer

cable has a plug connector. The 24 volt dc power cable

(10) supplies 30 volts ac power through the first set of

has two battery electrical clips and two cable nipples.

contacts in the relay, through the toggle switch (15), and

The cable nipples are made of plastic and are used to

through the air purifier power cable to operate the electric

insulate the electrical clips. The battery electrical clips

motor in the centrifugal fan assembly. If the 115 volt ac

are lead plated spring clips with terminals. The air

power source fails (or if this power is removed for any

purifier power cable has a electrical connector.

reason), current ceases to flow through

Electrical

plug

connector

Nut

Plastic electrical cable nipples

assembly

10 Step down power transformer

Battery electrical clip

Sleeving

11 Transformer cover

Plastic electrical insulation

Electrical connector cable

12 Machine screw

tape

clamp

13 Insulated electrical wire

Electrical conduit bushing

Machine screw (4 places)

14 Toggle switch

Electrical style box connector

Relay

15 Machine screw

Ground wire

Machine screw

16 Transformer case

90' housing of connector

Flat washer

17 Electrical plug connector

Lockwasher

18 Electrical power cables

Figure 5-4. Transformer details.

5-4