Installation, Location | Lincoln Electric AC-1200 specs

A-1

INSTALLATION

A-1

LOCATION

Install the welder in a dry location where there is free circu- lation of air in through the louvers in front and out through the louvers in the back of the case. A location which mini- mizes the amount of smoke and dirt drawn into the machine reduces the chance of dirt accumulation that can block air passages and cause overheating.

INPuT WIRING

WARNING

The AC-1200 does not have an input contactor. Therefore, include an external starter or disconnect switch when plan- ning the input circuit.

Remove the right side panel of teh AC-1200 and bring the input power lines through the hole in the back of the case. See the table below for reccomended sizing of input leads and overcur- rent protection.

The frame of the welder must be grounded, A stud marked with

the symbol located on the welder case back hole in the back of the case is provided for this purpose. See the National Electrical Code for details on proper grounding methods.

ELECTRIC SHOCK

can kill.

•Have an electrician install and service this equipment.

•Turn the input power off at the fuse box before working on equipment.

•Do not touch electrically hot parts.

OuTPuT CONNECTIONS

a. Wire Feeder Connection

Turn the input power to the welder off. Remove the screw

and lift the hinged door on the front of the control panel to

expose the terminal strips. Connect the leads of the wire

feeder input control cable to the terminal strips exactly as

specified in the appropriate connection diagram. The AC-1200

to NA-4 connection diagrams are included in the NA-4

Failure to fuse the input lines per the specifications in this manual will constitute customer abuse and void the warranty.

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Have a qualified electrician make the complete input con- nection in accordance with the National Electrical Code, all local codes and the connection diagram located inside the machine.

Be sure the voltage, phase and frequency of the input power is as specified on the welder nameplate.

For most installations, connect the AC-1200 to single phase power or to one phase of a three phase line. Unbalanced line conditions can be easily avoided by properly balancing the AC-1200 with other machinery on the lines.

When installing two or four Scott connected AC-1200 machines for AC-AC tandem arc welding, three phase input power must be used. The terminals for connections to pro- vide an output phase angle less than or greater than the usual 90% phase angle are included on the input panel.

Operating Manual IM-278. Attach the control cables to the

panel at the right of the terminal strip using the clamps pro-

vided.

If connecting the AC-1200 to an older NA-4 with the toggle

switch type ‘Current Control’ (below code 7532), a K-775

‘Remote Control’ must be purchased and instal-led in accor-

dance with the connection diagram S-15667 on page 5. The

‘Remote Control’ cord can be lengthened to any length by prop-

erly splicing a four conductor cord to the standard 25’ cord

before connecting to the AC-1200 terminal strip.

If connecting the AC-1200 to an LAF-4 or the AC controls of

the LT-34 tractor, the AC-1200 must be ordered with the

required ‘–NL’ optional circuit installed. This kit includes the

K-775 ‘Remote Control’. Connect in accordance with dia-

gram S-15666 on page 5.

To connect the AC-1200 to any other wire feeder, write to the

factory for instructions giving complete nameplate information

for the specific equipment.

When connection to the terminal strips are completed, close

the door and replace the screw.

RATING: IP21 ENCLOSURE, INSULATION 155(F)

Recommended Input Wire, Grounding Conductor and Fuse Sizes

Based on National Electrical Code - 100% Duty Cycle 40˚C (104˚F) Ambient

Copper Wire Size - 75˚C in Conduit

Super Lag Fuses

Input Amps

Power Input Wires

Grounding Conductor

Size in Amps

Input

Voltage/

1 Phase

Scott

1 Phase

T & B

Scott

T & B

1 Phase

T & B

Scott

T & B

1 Phase

Scott

Hertz

Conn.

Term.

Conn.

Term.

Conn. Term.

Conn.

460/60

182

209

#4/0

31013

250MCM

31013

31007

300

350

440/50/60

190

219

#4/0

31013

250MCM

31013

31007

300

350

380/50/60

230

254

250MCM

31013

350MCM

31015

31007

300

400

Thomas & Betts wire terminals (or equal) recommended above are required to comply with applicable U.L. stan- dards for safety. A #30 hex (Allen) key wrench is required for assembly of terminals to wire.

IDEALARC® AC-1200