MAC TOOLS MW150K, Owner'S Manual

S-0092-G

OM-154 500 Page 3

2-3.

Gun Polarity For Wire Type

WARNING

ELECTRIC SHOCK can kill.

•

Do not touch live electrical parts.

•

Turn Off welding power source, and disconnect input power before inspecting or installing.

swarn1.1 2/93

1

Polarity Changeover Label

2

Polarity Jumper Links

Always read and follow wire man-
ufacturer’s recommended polarity.

There are two jumper links (1 set)
across each set of terminals. Be
sure to move each set of links when
changing polarity.

3

Pilot Light (See Section 4-1)

Close door.

Ref. ST-149 631-C

Tools Needed:

3/8 in

STRAIGHT

POLARITY

DCEN

REVERSE

POLARITY

DCEP

GUN POLARITY CHANGEOVER

For Flux

Cored Wires

(FCAW

Process)

For Solid

Steel Or

Wires

(GMAW)

S-116 599-C

Aluminum

Process)

2

3

1

Figure 2-4. Gun Polarity Connections

2-4.

Installing Welding Gun

1

Gun Securing Knob

2

Drive Assembly

3

Gun End

Loosen securing knob. Insert end
through front panel opening until it
bottoms against drive assembly.
Tighten knob.

4

Gun Trigger Plug

Insert into receptacle and tighten
threaded collar.

Close door.

Ref. ST-149 629-B

2

4

1

3

Figure 2-5. Gun Connections

2-5.

Connecting Input Power

Table 2-1. Electrical Service Requirements*

Input Voltage

230

Input Amperes At Rated Output

20

Recommended Standard Fuse Or Circuit Breaker Rating In Amperes

1

30

Input Conductor Size In AWG/Kcmil

2

14

Max Input Conductor Length In Feet (Meters)

3

65 (20)

Grounding Conductor Size In AWG/Kcmil

4

14

*

These values are calculated from the 1993 edition of the National Electrical Code (NEC).

1 Recommended fuse or circuit breaker size is that closest to 150% of rated input amperage of the welding power

source. Article 630-12(a) of NEC allows fuse or circuit breaker sizing up to 200% of rated input amperage.

2 Input conductor size is for insulated copper wire with 75

°

C rating with not more than three single current-carrying

conductors in a cable or raceway (Table 310-16 of NEC).

3 Maximum length is to prevent more than a 3% voltage drop between service entrance and input terminals of the

welding power source (Articles 210-19(a) and 215-2(b) of NEC).

4 The grounding conductor shall be colored or identified as specified in the NEC. Grounding conductor size for copper

wire is not required to be larger than input conductor (Article 250-95 of NEC).