Lincoln Electric IM665 User Manual

PRO-CUT

TM

25

OPERATOR’S MANUAL

IM665

January, 2001

Safety Depends on You

Lincoln arc welding and cutting
equipment is designed and built
with safety in mind. However, your
overall safety can be increased by
proper installation ... and thought­ful operation on your part. DO

NOT INSTALL, OPERATE OR
REPAIR THIS EQUIPMENT
WITHOUT READING THIS
MANUAL AND THE SAFETY
PRECAUTIONS CONTAINED
THROUGHOUT. And, most

importantly, think before you act
and be careful.

For use with machines having Code Number:

10661

• Sales and Service through Subsidiaries and Distributors Worldwide •

Cleveland, Ohio 44117-1199 U.S.A. TEL: [phone] FAX: [phone] WEB SITE: www.lincolnelectric.com

• World's Leader in Welding and Cutting Products •

Date of Purchase:
Serial Number:
Code Number:
Model:
Where Purchased:

Copyright © 2001 Lincoln Global Inc.

RETURN TO MAIN INDEX

ISO 9001

Designed and Manufactured Under a

Quality Program Certified by
ABS Quality Evaluations, Inc.

to ISO 9001 Requirements.

CERTIFICATE NUMBER: 30273

ANSI RAB

QMS

FOR ENGINE
powered equipment.

1.a. Turn the engine off before troubleshooting and maintenance
work unless the maintenance work requires it to be running.

____________________________________________________

1.b. Operate engines in open, well-ventilated
areas or vent the engine exhaust fumes
outdoors.

____________________________________________________

1.c. Do not add the fuel near an open flame
welding arc or when the engine is running.
Stop the engine and allow it to cool before
refueling to prevent spilled fuel from vaporiz­ing on contact with hot engine parts and
igniting. Do not spill fuel when filling tank. If
fuel is spilled, wipe it up and do not start
engine until fumes have been eliminated.

____________________________________________________

1.d. Keep all equipment safety guards, covers and devices in
position and in good repair.Keep hands, hair, clothing and
tools away from V-belts, gears, fans and all other moving
parts when starting, operating or repairing equipment.

____________________________________________________

1.e. In some cases it may be necessary to remove safety

guards to perform required maintenance. Remove
guards only when necessary and replace them when the
maintenance requiring their removal is complete.
Always use the greatest care when working near moving
parts.

___________________________________________________

1.f. Do not put your hands near the engine fan.
Do not attempt to override the governor or
idler by pushing on the throttle control rods
while the engine is running.

___________________________________________________

1.g. To prevent accidentally starting gasoline engines while
turning the engine or welding generator during maintenance
work, disconnect the spark plug wires, distributor cap or
magneto wire as appropriate.

i

SAFETY

i

ARC WELDING CAN BE HAZARDOUS. PROTECT YOURSELF AND OTHERS FROM POSSIBLE SERIOUS INJURY OR DEATH.
KEEP CHILDREN AWAY. PACEMAKER WEARERS SHOULD CONSULT WITH THEIR DOCTOR BEFORE OPERATING.

Read and understand the following safety highlights. For additional safety information, it is strongly recommended that you
purchase a copy of “Safety in Welding & Cutting - ANSI Standard Z49.1” from the American Welding Society, P.O. Box
351040, Miami, Florida 33135 or CSA Standard W117.2-1974. A Free copy of “Arc Welding Safety” booklet E205 is available
from the Lincoln Electric Company, 22801 St. Clair Avenue, Cleveland, Ohio 44117-1199.

BE SURE THAT ALL INSTALLATION, OPERATION, MAINTENANCE AND REPAIR PROCEDURES ARE
PERFORMED ONLY BY QUALIFIED INDIVIDUALS.

WARNING

Mar ‘95

ELECTRIC AND
MAGNETIC FIELDS
may be dangerous

2.a. Electric current flowing through any conductor causes
localized Electric and Magnetic Fields (EMF). Welding
current creates EMF fields around welding cables and
welding machines

2.b. EMF fields may interfere with some pacemakers, and
welders having a pacemaker should consult their physician
before welding.

2.c. Exposure to EMF fields in welding may have other health
effects which are now not known.

2.d. All welders should use the following procedures in order to
minimize exposure to EMF fields from the welding circuit:

2.d.1.

Route the electrode and work cables together - Secure
them with tape when possible.

2.d.2. Never coil the electrode lead around your body.

2.d.3. Do not place your body between the electrode and

work cables. If the electrode cable is on your right
side, the work cable should also be on your right side.

2.d.4. Connect the work cable to the workpiece as close as

possible to the area being welded.

2.d.5. Do not work next to welding power source.

1.h. To avoid scalding, do not remove the
radiator pressure cap when the engine is
hot.

CALIFORNIA PROPOSITION 65 WARNINGS

Diesel engine exhaust and some of its constituents
are known to the State of California to cause can­cer, birth defects, and other reproductive harm.

The engine exhaust from this product contains
chemicals known to the State of California to cause
cancer, birth defects, or other reproductive harm.

The

Above For Diesel Engines

The Above For Gasoline Engines

PRO-CUT 25

ii

SAFETY

ii

ARC RAYS can burn.

4.a. Use a shield with the proper filter and cover
plates to protect your eyes from sparks and
the rays of the arc when welding or observing
open arc welding. Headshield and filter lens
should conform to ANSI Z87. I standards.

4.b. Use suitable clothing made from durable flame-resistant
material to protect your skin and that of your helpers from
the arc rays.

4.c. Protect other nearby personnel with suitable, non-flammable
screening and/or warn them not to watch the arc nor expose
themselves to the arc rays or to hot spatter or metal.

ELECTRIC SHOCK can
kill.

3.a. The electrode and work (or ground) circuits
are electrically “hot” when the welder is on.
Do not touch these “hot” parts with your bare
skin or wet clothing. Wear dry, hole-free

gloves to insulate hands.

3.b. Insulate yourself from work and ground using dry insulation.
Make certain the insulation is large enough to cover your full
area of physical contact with work and ground.

In addition to the normal safety precautions, if welding
must be performed under electrically hazardous
conditions (in damp locations or while wearing wet
clothing; on metal structures such as floors, gratings or
scaffolds; when in cramped positions such as sitting,
kneeling or lying, if there is a high risk of unavoidable or
accidental contact with the workpiece or ground) use
the following equipment:

• Semiautomatic DC Constant Voltage (Wire) Welder.

• DC Manual (Stick) Welder.

• AC Welder with Reduced Voltage Control.

3.c. In semiautomatic or automatic wire welding, the electrode,
electrode reel, welding head, nozzle or semiautomatic
welding gun are also electrically “hot”.

3.d. Always be sure the work cable makes a good electrical
connection with the metal being welded. The connection
should be as close as possible to the area being welded.

3.e. Ground the work or metal to be welded to a good electrical
(earth) ground.

3.f.

Maintain the electrode holder, work clamp, welding cable and
welding machine in good, safe operating condition. Replace
damaged insulation.

3.g. Never dip the electrode in water for cooling.

3.h. Never simultaneously touch electrically “hot” parts of
electrode holders connected to two welders because voltage
between the two can be the total of the open circuit voltage
of both welders.

3.i. When working above floor level, use a safety belt to protect
yourself from a fall should you get a shock.

3.j. Also see Items 6.c. and 8.

FUMES AND GASES
can be dangerous.

5.a. Welding may produce fumes and gases
hazardous to health. Avoid breathing these
fumes and gases.When welding, keep
your head out of the fume. Use enough
ventilation and/or exhaust at the arc to keep

fumes and gases away from the breathing zone. When

welding with electrodes which require special
ventilation such as stainless or hard facing (see
instructions on container or MSDS) or on lead or
cadmium plated steel and other metals or coatings
which produce highly toxic fumes, keep exposure as
low as possible and below Threshold Limit Values (TLV)
using local exhaust or mechanical ventilation. In
confined spaces or in some circumstances, outdoors, a
respirator may be required. Additional precautions are
also required when welding on galvanized steel.

5.b.

Do not weld in locations near chlorinated hydrocarbon

vapors
coming from degreasing, cleaning or spraying operations.
The heat and rays of the arc can react with solvent vapors

to
form phosgene, a highly toxic gas, and other irritating prod­ucts.

5.c. Shielding gases used for arc welding can displace air and
cause injury or death. Always use enough ventilation,
especially in confined areas, to insure breathing air is safe.

5.d. Read and understand the manufacturer’s instructions for this

equipment and the consumables to be used, including the
material safety data sheet (MSDS) and follow your
employer’s safety practices. MSDS forms are available from
your welding distributor or from the manufacturer.

5.e. Also see item 1.b.

Mar ‘95

PRO-CUT 25

FOR ELECTRICALLY
powered equipment.

8.a. Turn off input power using the disconnect
switch at the fuse box before working on
the equipment.

8.b. Install equipment in accordance with the U.S. National
Electrical Code, all local codes and the manufacturer’s
recommendations.

8.c. Ground the equipment in accordance with the U.S. National
Electrical Code and the manufacturer’s recommendations.

CYLINDER may explode
if damaged.

7.a. Use only compressed gas cylinders
containing the correct shielding gas for the
process used and properly operating
regulators designed for the gas and

pressure used. All hoses, fittings, etc. should be suitable for
the application and maintained in good condition.

7.b. Always keep cylinders in an upright position securely
chained to an undercarriage or fixed support.

7.c. Cylinders should be located:

• Away from areas where they may be struck or subjected to

physical damage.

• A safe distance from arc welding or cutting operations and

any other source of heat, sparks, or flame.

7.d. Never allow the electrode, electrode holder or any other
electrically “hot” parts to touch a cylinder.

7.e. Keep your head and face away from the cylinder valve outlet
when opening the cylinder valve.

7.f. Valve protection caps should always be in place and hand
tight except when the cylinder is in use or connected for
use.

7.g. Read and follow the instructions on compressed gas
cylinders, associated equipment, and CGA publication P-l,
“Precautions for Safe Handling of Compressed Gases in
Cylinders,” available from the Compressed Gas Association
1235 Jefferson Davis Highway, Arlington, VA 22202.

iii

SAFETY

iii

Mar ‘95

WELDING SPARKS can
cause fire or explosion.

6.a.

Remove fire hazards from the welding area.

If this is not possible, cover them to prevent

the welding sparks from starting a fire.

Remember that welding sparks and hot
materials from welding can easily go through small cracks
and openings to adjacent areas. Avoid welding near
hydraulic lines. Have a fire extinguisher readily available.

6.b. Where compressed gases are to be used at the job site,
special precautions should be used to prevent hazardous
situations. Refer to “Safety in Welding and Cutting” (ANSI
Standard Z49.1) and the operating information for the
equipment being used.

6.c. When not welding, make certain no part of the electrode
circuit is touching the work or ground. Accidental contact
can cause overheating and create a fire hazard.

6.d. Do not heat, cut or weld tanks, drums or containers until the
proper steps have been taken to insure that such procedures
will not cause flammable or toxic vapors from substances
inside. They can cause an explosion even

though

they have
been “cleaned”. For information, purchase “Recommended
Safe Practices for the

Preparation

for Welding and Cutting of
Containers and Piping That Have Held Hazardous
Substances”, AWS F4.1 from the American Welding Society

(see address above).

6.e. Vent hollow castings or containers before heating, cutting or
welding. They may explode.

6.f.

Sparks and spatter are thrown from the welding arc. Wear oil
free protective garments such as leather gloves, heavy shirt,
cuffless trousers, high shoes and a cap over your hair. Wear
ear plugs when welding out of position or in confined places.
Always wear safety glasses with side shields when in a
welding area.

6.g. Connect the work cable to the work as close to the welding
area as practical. Work cables connected to the building
framework or other locations away from the welding area
increase the possibility of the welding current passing
through lifting chains, crane cables or other alternate cir­cuits. This can create fire hazards or overheat lifting chains
or cables until they fail.

6.h. Also see item 1.c.

PRO-CUT 25

iv

SAFETY

iv

PRÉCAUTIONS DE SÛRETÉ

Pour

votre propre protection lire et observer toutes les instructions
et les précautions de sûreté specifiques qui parraissent dans ce
manuel aussi bien que les précautions de sûreté générales suiv­antes:

Sûreté Pour Soudage A L’Arc

1. Protegez-vous contre la secousse électrique:

a. Les circuits à l’électrode et à la piéce sont sous tension

quand la machine à souder est en marche. Eviter toujours
tout contact entre les parties sous tension et la peau nue
ou les vétements mouillés. Porter des gants secs et sans
trous pour isoler les mains.

b. Faire trés attention de bien s’isoler de la masse quand on

soude dans des endroits humides, ou sur un plancher
metallique ou des grilles metalliques, principalement dans
les positions assis ou couché pour lesquelles une grande
partie du corps peut être en contact avec la masse.

c. Maintenir le porte-électrode, la pince de masse, le câble

de soudage et la machine à souder en bon et sûr état
defonctionnement.

d.Ne jamais plonger le porte-électrode dans l’eau pour le

refroidir.

e. Ne jamais toucher simultanément les parties sous tension

des porte-électrodes connectés à deux machines à souder
parce que la tension entre les deux pinces peut être le
total de la tension à vide des deux machines.

f. Si on utilise la machine à souder comme une source de

courant pour soudage semi-automatique, ces precautions
pour le porte-électrode s’applicuent aussi au pistolet de
soudage.

2. Dans le cas de travail au dessus du niveau du sol, se protéger
contre les chutes dans le cas ou on recoit un choc. Ne jamais
enrouler le câble-électrode autour de n’importe quelle partie
du corps.

3. Un coup d’arc peut être plus sévère qu’un coup de soliel,
donc:

a. Utiliser un bon masque avec un verre filtrant approprié

ainsi qu’un verre blanc afin de se protéger les yeux du ray­onnement de l’arc et des projections quand on soude ou
quand on regarde l’arc.

b. Porter des vêtements convenables afin de protéger la

peau de soudeur et des aides contre le rayonnement de
l‘arc.

c. Protéger l’autre personnel travaillant à proximité au

soudage à l’aide d’écrans appropriés et non-inflammables.

4. Des gouttes de laitier en fusion sont émises de l’arc de
soudage. Se protéger avec des vêtements de protection libres
de l’huile, tels que les gants en cuir, chemise épaisse, pan­talons sans revers, et chaussures montantes.

5. Toujours porter des lunettes de sécurité dans la zone de
soudage. Utiliser des lunettes avec écrans lateraux dans les

zones où l’on pique le laitier.

6. Eloigner les matériaux inflammables ou les recouvrir afin de
prévenir tout risque d’incendie dû aux étincelles.

7. Quand on ne soud

e pas, poser la pince à une endroit isolé de
la masse. Un court-circuit accidental peut provoquer un
échauffement et un risque d’incendie.

8. S’assurer que la masse est connectée le plus prés possible
de la zone de travail qu’il est pratique de le faire. Si on place
la masse sur la charpente de la construction ou d’autres
endroits éloignés de la zone de travail, on augmente le risque
de voir passer le courant de soudage par les chaines de lev­age, câbles de grue, ou autres circuits. Cela peut provoquer
des risques d’incendie ou d’echauffement des chaines et des
câbles jusqu’à ce qu’ils se rompent.

9. Assurer une ventilation suffisante dans la zone de soudage.
Ceci est particuliérement important pour le soudage de tôles
galvanisées plombées, ou cadmiées ou tout autre métal qui
produit des fumeés toxiques.

10. Ne pas souder en présence de vapeurs de chlore provenant
d’opérations de dégraissage, nettoyage ou pistolage. La
chaleur ou les rayons de l’arc peuvent réagir avec les vapeurs
du solvant pour produire du phosgéne (gas fortement toxique)
ou autres produits irritants.

11. Pour obtenir de plus amples renseignements sur la sûreté,
voir le code “Code for safety in welding and cutting” CSA
Standard W 117.2-1974.

PRÉCAUTIONS DE SÛRETÉ POUR
LES MACHINES À SOUDER À
TRANSFORMATEUR ET À
REDRESSEUR

1. Relier à la terre le chassis du poste conformement au code de
l’électricité et aux recommendations du fabricant. Le dispositif
de montage ou la piece à souder doit être branché à une
bonne mise à la terre.

2. Autant que possible, I’installation et l’entretien du poste seront
effectués par un électricien qualifié.

3. Avant de faires des travaux à l’interieur de poste, la debranch­er à l’interrupteur à la boite de fusibles.

4. Garder tous les couvercles et dispositifs de sûreté à leur
place.

Mar. ‘93

PRO-CUT 25

Thank You

for selecting a QUALITY product by Lincoln Electric. We want you
to take pride in operating this Lincoln Electric Company product

••• as much pride as we have in bringing this product to you!

Read this Operators Manual completely before attempting to use this equipment. Save this manual and keep it
handy for quick reference. Pay particular attention to the safety instructions we have provided for your protection.
The level of seriousness to be applied to each is explained below:

WARNING

This statement appears where the information must be followed exactly to avoid serious personal injury or
loss of life.

This statement appears where the information must be followed to avoid minor personal injury or damage to
this equipment.

CAUTION

Please Examine Car

ton and Equipment For Damage Immediately

When this equipment is shipped, title passes to the purchaser upon receipt by the carrier. Consequently, Claims
for material damaged in shipment must be made by the purchaser against the transportation company at the
time the shipment is received.

Please record your equipment identification information below for future reference. This information can be
found on your machine nameplate.

Model Name & Number _____________________________________

Code & Serial Number _____________________________________

Date of Purchase _____________________________________

Whenever you request replacement parts for or information on this equipment always supply the information
you have recorded above.

TABLE OF CONTENTS

Page

Installation.......................................................................................................................Section A

Technical Specifications.......................................................................................................A-1

Safety Precautions ...............................................................................................................A-2

Select Proper Location .........................................................................................................A-2

Stacking................................................................................................................................A-2

Tilting....................................................................................................................................A-2

High Frequency Interference Protection...............................................................................A-2

Input Electrical Connections.................................................................................................A-2

Gas Input Connections.........................................................................................................A-3

Output Connections..............................................................................................................A-3

Torch .............................................................................................................................A-3

Operation.........................................................................................................................Section B

Safety Precautions ...............................................................................................................B-1

Description ...........................................................................................................................B-1

Preheat Temperature for Plasma Cutting.............................................................................B-1

User Responsibility...............................................................................................................B-2

Operational Features and Controls ......................................................................................B-2

Design Features and Advantages ........................................................................................B-2

Cutting Capability .................................................................................................................B-3

Consumable Life ..................................................................................................................B-3

Limitations ............................................................................................................................B-4

Controls and Settings ...........................................................................................................B-4

Pilot Arc Discussion..............................................................................................................B-5

Procedure Recommendations..............................................................................................B-6

General .........................................................................................................................B-6

Thin Gauge Sheet and Material up to 3/8” ....................................................................B-6

Suggestions for Extra Utility from the PRO-CUT System .............................................B-6

Accessories.....................................................................................................Section C

Genuine Lincoln Parts ...........................................................................................C-1

General Options / Accessories..............................................................................C-1

Maintenance ....................................................................................................Section D

Safety Precautions ................................................................................................D-1

Routine Maintenance.............................................................................................D-1

Periodic Maintenance............................................................................................D-1

Troubleshooting..............................................................................................Section E

Safety Precautions.................................................................................................E-1

How to Use Troubleshooting Guide.......................................................................E-1

Troubleshooting Guide ..........................................................................................E-2

Wiring Diagrams..............................................................................................Section F

Wiring Diagram ......................................................................................................F-1

Parts Lists........................................................................................................Appendix

PRO-CUT 25 ...........................................................................................P357 Series

Torch...............................................................................................................P210-U

A-1

INSTALLATION

A-1

Weight

Including

Torch Cable

35 lbs.

15.9 kg.

INPUT - SINGLE PHASE / 60 HERTZ ONLY

RATED OUTPUT

OUTPUT

RECOMMEND INPUT WIRE AND FUSE SIZES

REQUIRED GAS FLOW RATE REQUIRED GAS INLET PRESSURE

PHYSICAL DIMENSIONS

TECHNICAL SPECIFICATIONS - PRO-CUT 25 (K1756-1)

Standard

Voltage

Duty Cycle

20% on 115 V
60% on 115 V

100% on 230 V

35% on 115 V
60% on 230 V

Current

Rang

e

12-25 Amps

AC Input

Voltage

at
50/60
Hertz

230V-1Ø

115V-1Ø
115V-1Ø
115V-1Ø

Fuse

(Super Lag)

Circuit Breaker

(Delay Type)

20 AMPS

15 AMPS
20 AMPS
30 AMPS

#14 (2.5 mm

2

)

#12 (4 mm

2

)
#12 (4 mm2)
#12 (4 mm

2

)

2 Input Supply Wires

1 Ground Wire

#14 (2.5 mm

2

)

#12 (4 mm

2

)
#12 (4 mm2)
#12 (4 mm

2

)

Type 75

o

C

Copper Wire in Conduit

AWG (IEC) Sizes

Depth

16.1 in.

410 mm

Width

6.3 in.

160 mm

Height

10.2 in.

260 mm

Open Cir

cuit

V

oltage

400 VDC

For all plasma cutting applications

Based on U.S. National Electrical Code

Ambient Temperature 30

o

C or Less

Pilot Current

12 Amps

AMPS

15 A
20 A
20 A
25 A
25 A

1Ø Input Current at Rated Output

115/230/1/50/60Hz

115 V : 15 A @ 20%
115 V : 26.7A@ 60%
115 V : 37.7A@ 35%
230 V : 15 A@100%
230 V : 19 A @ 60%

55 PSI @ 240 SCFH

( 3.8 Bar. @ 6800 LHR)

65 to 150 PSI

(4.5 Bar. TO 10.3 Bar.)

25 A

15 A
20 A
25 A

Output

Input Cord

Plug
Size

6-20P or 6-30P or 6-50P

5-15P* or 5-20P* or 5-30P or 5-50P

5-20P* or 5-30P or 5-50P

5-30P or 5-50P

* Included with machine

PRO-CUT 25

A-2

INSTALLATION

PRO-CUT 25

A-2

Read entire Installation Section before installing the
PRO-CUT 25.

SAFETY PRECAUTIONS

ELECTRIC SHOCK CAN KILL.

• Only qualified personnel
should install this machine.

• Turn the input power OFF
at the disconnect switch or
fuse box and discharge input
capacitors before working
inside the equipment.

• Do not touch electrically hot parts.

• Turn the PRO-CUT Power Switch OFF
when connecting power cord to input
power.

___________________________________________

SELECT PROPER LOCATION

Place the PRO-CUT 25 where clean cool air can
freely circulate in and out the side louvers. Dirt, dust
or any foreign material that can be drawn into the
machine should be kept at a minimum. Failure to
observe these precautions can result in excessive
operating temperatures and nuisance shutdown of the
machine.

A source of clean, dry air or nitrogen must be supplied
to the PRO-CUT 25. Oil in the air is a severe problem
and must be avoided. The supply pressure must be
between 80 and 150 psi. The flow rate is approximate­ly 4.0 cfm (113 l/min.). Failure to observe these pre­cautions could result in excessive operating tempera­tures or damage to the torch.

STACKING

The PRO-CUT 25 cannot

be stacked.

TILTING

The PRO-CUT 25 must be placed on a stable, level
surface so it will not topple over.

HIGH FREQUENCY INTERFERENCE
PROTECTION

The PRO-CUT 25 employs a touch start mechanism
for arc initiation which eliminates high frequency emis­sions from the machine as compared with spark gap
and solid state type high frequency generators. Keep
in mind, though, that these machines may be used in
an environment where other high frequency generat­ing machines are operating. By taking the following
steps, high frequency interference into the Pro-Cut
can be minimized

(1) Make sure the power supply chassis is connected

to a good earth ground. The work terminal ground
does NOT ground the machine frame.

(2) Keep the work ground clamp isolated from other

work clamps that have high frequency.

(3) If the ground clamp cannot be isolated, then keep

the clamp as far as possible from other work
clamp connections.

(4) When the machine is enclosed in a metal building,

several good earth driven electrical grounds
around the periphery of the building are recom­mended.

Failure to observe these recommended installation
procedures may cause improper function of the Pro­Cut or possibly even damage to the control system or
power supply components.

INPUT ELECTRICAL
CONNECTIONS

The PRO-CUT 25 is rated for 115VAC or 230VAC
inputs and will automatically reconnect for the sup­plied voltage. The machine is shipped from the factory
for operation on 115VAC 15 amp circuits. Use on 15
amp branch circuits will limit cutting output as indicat­ed by the graphics around the output knob. If the out­put is set at 20 amps or greater, the input fuse or cir­cuit breaker may “blow” in roughly 30 seconds or less
(depending on fuse or circuit breaker type).

To achieve 20 amp output with 115VAC input, replace
the 15 amp plug on the input cord with the supplied 20
amp plug, and connect the unit to a 20 amp branch
circuit with super lag fuses (or equivalent breaker). To
install the supplied 20 amp plug: Connect the white
(neutral) wire under terminal clamp with silver screw,
and black (hot) wire under terminal clamp with brass
screw. Connect green wire under terminal clamp with
green screw. Tighten terminal wire clamp screws

WARNING