Section II. MOVEMENT TO A NEW WORKSITE

Figure 2-3. Voltage change bars for 230 or 460 volt input

Figure 2-4. Contros and instruments. front panel.

TM-5-3431-228-14 Welding Machine ARC: AC/DC 300 Amp Transformer Rectifier; Constant Current Base Mounted FSN 3431-235-4728 Manual
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12

with a disconnect switch.

long or shorter. Provide a 150 ampere fuse for 230-

(1) Check voltage source. Remove the two screws

volt input and an 80 ampere fuse for 460-volt input.

at the bottom of the contactor access panel on the

Note. The machine will operate from a single phase power

rear of the machine. Open the hinged panel.

line or from any one phase of a three-phase power line. For use on

(2) Check that the jumpers (voltage-change bus

three-phase power lines, choose any two of the three hot wires

bars) are located properly for the available voltage.

plus a grounding wire for correction to the welding machine.

(fig. 2-3). (A copy of figure 2-3 is on the back of the

Using conduit, bring the two primary power leads and the ground

wire through the cable entrance hole directly below the primary

access panel door).

panel of the welding machine. Connect the two primary power

(3) Connect the welding machine to ac power.

leads to the line terminals on contactor and primary panel. Attach

Use no. 3 AWG wire for 230-volt input and no. 6

the grounding wire to the grounding screw located below the con-

AWG wire for 460-volt input when wires are 25 feet

tactor inside the rear door.

Section II. MOVEMENT TO A NEW WORKSITE

2-5. Dismantling for Movement

a suitable lifting device, If the machine is to be

a. Reverse the sequence of the steps taken in para-

moved within a building, it can be moved with a fork-

graph 2-4, disconnecting cables, ground connections,

lift, or on its skids.

and hoses and/or piping from gas and water con-

2-6. Reinstallation after Movement

nections.

Proceed in accordance with the instructions given in

b. Cover the water and gas connection fittings if

paragraph 2-4. The procedure is identical to that of

the welding machine is to be moved other than a

installation.

short distance. Load the machine on the carrier using

Section III. CONTROLS AND INSTRUMENTS

2-7. General

(3) GAS- WATER switch. This two-position

switch turns the gas and water ON or OFF. It is

This section describes the various controls and in-

used in the ON position during TIG welding, and

struments and provides the operator sufficient in-

must be OFF for metallic arc welding.

formation to insure proper operation of Model

(4) GAS- WATER indicator light. This light

MD301 FED Inert Gas Shielded Arc Welding Ma-

glows red when the GAS-WATER switch is in the ON

chine.

position and goes out when timer Ml times out.

2-8. Controls and Instruments

(5) HIGH FREQUENCY switch. This two-posi-

a. Figure 2-4 illustrates the front panel of the ma-

tion switch applies power to a high-frequency `trans-

former when in the ON position, for use in high fre-

chine, which contains all operator's controls and in-

struments. Figure 2-5 illustrates the controls in the

quency welding.

timer drawer.

(6) HIGH FREQUENCY indicator light. This

light glows red when the HIGH FREQUENCY

b. The purpose of the controls and instruments are

switch is ON. The light is located beside the switch.

as follows:

(1) POWER switch. Two-position momentary

It goes out after the arc is started if HIGH FRE-

QUENCY dropout switch is in START ONLY posi-

switch turns power ON or OFF.

(2) POWER indicator light. Located beside the

tion.

POWER switch, this light glows red when the POW-

(7) HIGH FREQUENCY START control. This

control is an intensity selector used to dampen the

ER switch is ON and power is connected.

2-7

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