Firepower MST 180i Operating Manual page 30

Firepower MST 180i
Electrical Input Requirements
Operate the welding Power Source from a single-phase 50/60 Hz, AC power supply. The input voltage must match one of the
electrical input voltages shown on the input data label on the unit nameplate. Contact the local electric utility for information
about the type of electrical service available, how proper connections should be made, and inspection required. The line
disconnect switch provides a safe and convenient means to completely remove all electrical power from the welding power
source whenever necessary to inspect or service the unit.
Do not connect an input (WHITE or BLACK) conductor to the ground terminal.
Do not connect the ground (GREEN) conductor to an input line terminal.
• Correctly installed, if necessary, by a qualified electrician.
• Correctly earthed (electrically) in accordance with local regulations.
• Connected to the correct size power point, fuse and primary supply lead based on Table 3-1.
An electric shock or fire hazard is probable if the following electrical service guide recommendations are not
followed. These recommendations are for a dedicated branch circuit sized for the rated output and duty cycle of
the welding Power Source.
Supply Voltage
Input Current at Maximum Output
Maximum Recommended Fuse* or Circuit Breaker Rating
*Time Delay Fuse, UL class RK5. Refer to UL248
Maximum Recommended Fuse^ or Circuit Breaker Rating
^Normal Operating , UL class K5. Refer to UL248
Minimum Recommended Input Cable Size
Maximum Recommended Input Conductor Length
Minimum Recommended Grounding Conductor Size
Welding arc outs may be experienced if an extension cord is used when STICK welding when operation the Power
Source on 208 VAC due to the lack of DC voltage at the STICK electrode.
Input Power
Each unit incorporates an INRUSH circuit. When the MAIN CIRCUIT SWITCH is turned ON, the inrush circuit provides pre-
charging for the input capacitors. A relay in the Power Control Assembly (PCA) will turn ON after the input capacitors have
charged to operating voltage (after approximately 5 seconds)
Damage to the PCA could occur if 265V AC or higher is applied to the Primary Power Cord.
Primary Supply
Model
(Factory Fitted)
Firepower
12 AWG (3.3mm²)
MST 180i
INSTALLATION, OPERATION AND SETUP
Table 3-1: Electrical Service Guide
Minimum Primary
Cord Size Current Circuit Size
(Vin/Amps)
208-230V/40A
208-230V/25A
Table 3-2: Primary Circuit Sizes to Achieve Maximum Current
WARNING
50 / 60 Hz Single Phase Supply
NOTE
NOTE
MIG (GMAW/
FCAW)
180A @ 20%
3-2
230V AC
35.7 Amps
50 Amps
50 Amps
12 AWG
50 ft (15m)
12 AWG
Current & Duty Cycle
LIFT TIG
STICK (SMAW)
(GTAW)
175A @ 20%
175A @ 25%
Manual 0-5339