Gun Polarity For Wire Type; Installing Welding Gun; Connecting Input Power - MAC TOOLS MW150K Owner's Manual

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.
STRAIGHT REVERSE
POLARITY POLARITY
For Flux
Cored Wires
(FCAW
Process)
DCEN DCEP
GUN POLARITY CHANGEOVER
Tools Needed:
3/8 in

2-4. Installing Welding Gun

2-5. Connecting Input Power

Input Voltage
Input Amperes At Rated Output
Recommended Standard Fuse Or Circuit Breaker Rating In Amperes
Input Conductor Size In AWG/Kcmil
Max Input Conductor Length In Feet (Meters)
Grounding Conductor Size In AWG/Kcmil
*
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).
OM-154 500 Page 3
1
For Solid
Steel Or
Aluminum
3
Wires
(GMAW)
Process)
S-116 599-C
Figure 2-4. Gun Polarity Connections
1
2 3
4
Figure 2-5. Gun Connections
Table 2-1. Electrical Service Requirements*
2
2
3
4
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
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
230
20
1
30
14
65 (20)
14
S-0092-G
swarn1.1 2/93