PT-20AMX and PT-21AMX
Plasmarc Cutting Torches
0558004291
Instruction Manual (GB)
80
These INSTRUCTIONS are for experienced operators. If you are not fully familiar with the principles of opera-
tion and safe practices for arc welding and cutting equipment, we urge you to read our booklet, "Precautions
and Safe Practices for Arc Welding, Cutting, and Gouging," Form 52-529. Do NOT permit untrained persons to
install, operate, or maintain this equipment. Do NOT attempt to install or operate this equipment until you
have read and fully understand these instructions. If you do not fully understand these instructions, contact
your supplier for further information. Be sure to read the Safety Precautions before installing or operating
this equipment.
BE SURE THIS INFORMATION REACHES THE OPERATOR.
YOU CAN GET EXTRA COPIES THROUGH YOUR SUPPLIER.
USER RESPONSIBILITY
This equipment will perform in conformity with the description thereof contained in this manual and accompanying la-
bels and/or inserts when installed, operated, maintained and repaired in accordance with the instructions provided. This
equipment must be checked periodically. Malfunctioning or poorly maintained equipment should not be used. Parts that
are broken, missing, worn, distorted or contaminated should be replaced immediately. Should such repair or replacement
become necessary, the manufacturer recommends that a telephone or written request for service advice be made to the
Authorized Distributor from whom it was purchased.
This equipment or any of its parts should not be altered without the prior written approval of the manufacturer. The user
of this equipment shall have the sole responsibility for any malfunction which results from improper use, faulty mainte-
nance, damage, improper repair or alteration by anyone other than the manufacturer or a service facility designated by the
manufacturer.
81
SECTION TITLE PAGE
SECTION 1 SAFETY .................................................................................................................................................83
SECTION 2 DESCRIPTION ......................................................................................................................................................................... 85
2.0 Description ................................................................................................................................................................................85
2.1 Accessories .................................................................................................................................................................................86
SECTION 3 INSTALLATION ....................................................................................................................................................................... 89
SECTION 4 OPERATION ............................................................................................................................................................................. 93
TABLE OF CONTENTS
82
TABLE OF CONTENTS
83
SECTION 1 SAFETY PRECAUTIONS
1.0 Safety Precautions
Users of ESAB welding and plasma cutting equipment have the ultimate responsibility for ensuring that anyone
who works on or near the equipment observes all the relevant safety precautions. Safety precautions must meet
the requirements that apply to this type of welding or plasma cutting equipment. The following recommendations
should be observed in addition to the standard regulations that apply to the workplace.
All work must be carried out by trained personnel well acquainted with the operation of the welding or plasma
cutting equipment. Incorrect operation of the equipment may lead to hazardous situations which can result in
injury to the operator and damage to the equipment.
1. Anyone who uses welding or plasma cutting equipment must be familiar with:
- its operation
- location of emergency stops
- its function
- relevant safety precautions
- welding and / or plasma cutting
2. The operator must ensure that:
- no unauthorized person stationed within the working area of the equipment when it is started up.
- no one is unprotected when the arc is struck.
3. The workplace must:
- be suitable for the purpose
- be free from drafts
4. Personal safety equipment:
- Always wear recommended personal safety equipment, such as safety glasses, flame proof
clothing, safety gloves.
- Do not wear loose fitting items, such as scarves, bracelets, rings, etc., which could become
trapped or cause burns.
5. General precautions:
- Make sure the return cable is connected securely.
- Work on high voltage equipment may only be carried out by a qualified electrician.
- Appropriate fire extinquishing equipment must be clearly marked and close at hand.
- Lubrication and maintenance must not be carried out on the equipment during operation.
84
SECTION 1 SAFETY PRECAUTIONS
WELDING AND PLASMA CUTTING CAN BE INJURIOUS TO YOURSELF AND
OTHERS. TAKE PRECAUTIONS WHEN WELDING OR CUTTING. ASK FOR
YOUR EMPLOYER’S SAFETY PRACTICES WHICH SHOULD BE BASED ON
MANUFACTURERS’ HAZARD DATA.
ELECTRIC SHOCK
- Can kill.
- Install and earth (ground) the welding or plasma cutting unit in accordance with applicable standards.
- Do not touch live electrical parts or electrodes with bare skin, wet gloves or wet clothing.
- Insulate yourself from earth and the workpiece.
- Ensure your working stance is safe.
FUMES AND GASES
- Can be dangerous to health.
- Keep your head out of the fumes.
- Use ventilation, extraction at the arc, or both, to take fumes and gases away from your breathing zone
and the general area.
ARC RAYS - Can injure eyes and burn skin.
- Protect your eyes and body. Use the correct welding / plasma cutting screen and filter lens and wear
protective clothing.
- Protect bystanders with suitable screens or curtains.
FIRE HAZARD
- Sparks (spatter) can cause fire. Make sure therefore that there are no inflammable materials nearby.
NOISE - Excessive noise can damage hearing.
- Protect your ears. Use earmuffs or other hearing protection.
- Warn bystanders of the risk.
MALFUNCTION - Call for expert assistance in the event of malfunction.
READ AND UNDERSTAND THE INSTRUCTION MANUAL BEFORE INSTALLING OR OPERATING.
PROTECT YOURSELF AND OTHERS!
WARNING
85
SECTION 2 DESCRIPTION
2.0 Description
This booklet covers mainly accessories, maintenance, and parts information for
the PT-20AMX and PT-21AMX plasma torches. For installation and operating
instructions for your cutting package, refer to your power source instruction
manual.
The patented PT-20AMX is a 100 amp capacity, pilot-arc mechanized torch
available in 6 different versions. The torch uses clean, dry air as the cut gas for
cutting carbon steel, aluminum, or stainless steel.
PT-21 AMX Torch is identical to the PT-20 AMX torch except it is specifically
designed to connect to the PowerCut 1250 and 1500 plasma power sources.
DO NOT use oxygen with this
torch! A hazardous fire may
result.
PT-20 AMX
Without Rack; 7.6m (25 ft.) ............................................................ 0558003426
With Rack; 7.6m (25 ft.) ..........................................................................................0558003427
Without Rack; 15.2m (50 ft.) ................................................................................0558003422
With Rack; 15.2m (50 ft.) .......................................................................................0558003421
Without Rack, 1.2m (4 ft.) .....................................................................................0558003424
Without Rack, 5.2m (17 ft.) ...................................................................................0558003425
PT-21 AMX (for use with PowerCut 1250 and PowerCut 1500)
Without Rack; 15.2m (50 ft.) .......................................................... 0558003615
With Rack; 15.2m (50 ft.) ................................................................ 0558003614
Without Rack; 7.6m (25 ft.) ............................................................ 0558003617
With Rack; 7.6m (25 ft.) .................................................................. 0558003616
Dimensional Data
17.125 inches
1.375 inches
14.5 inches
7.63 inches
34.9mm (1.38")
435.0mm (17.13")
193.8mm (7.63")
368.3mm (14.50")
WARNING
86
SECTION 2 DESCRIPTION
2.1 Accessories
PT-20AMX Torch Spare Parts Kits - The following three spare parts kits are available
for maintaining the PT-20AMX torch with minimum downtime.
50 Amps - 21370 (2461001)
70 Amps - 21369 (0558000848)
90 Amps - 0558004271 (0558004277)
100 Amps – 21376 (0558004259)
PT-21 AMX torch uses the same spare parts as the PT-20AMX.
NOTE:
Part numbers in parenthesis ap-
ply to "CE" / European units only.
Description
Part Number Quantity
Standard "CE" European 50 AMP 70 AMP 90 AMP 100 AMP
Heat Shield (70/100 A) 21326 4485831 - 2 2 2
Heat Shield (50 A) 21447 4485832 2 1 1 1
Cutting Nozzle (50 A) 21330 4485833 5 5 5 5
Cutting Nozzle (70 A) 21329 4485834 - 5 5 5
Cutting Nozzle (90 A) 0558004269 0558004269 - - 5 -
Cutting Nozzle (100 A) 21328 4485835 - - - 5
Electrode 21150 0558004249 5 5 - 5
Electrode 50Hz 0558001617 0558001617 5 5 5 5
Electrode Seat 21372 4485839 1 1 - 1
Electrode Insulator 21373 21373 1 1 1 1
Electrode Holder Assy 21332 4485840 1 1 1 1
Baffle Tube 21374 4485838 1 1 1 1
Pilot Arc Adaptor 21803 21803 1 1 1 1
O-ring 488157 4485841 5 5 5 5
Lubricant (1 oz.) 17672 0558000443 1 1 1 1
Seat/Baffle Wrench 21375 4485842 1 1 1 1
1/16: Hex-Key Wrench 93750006 4485651 1 1 1 1
87
Torch Holder Assembly – 0558005926
Plasma Flow Measuring Kit — 19765 (0558000739)
Remote Hand Control Switch with 7.6m (25 ft.) lead
For PT-20 AMX — 680982 (0558004251)
For PT-21 AMX — 0558003612
Adaptor for PCM-875 and PCM-1125 — 19500 (0558004252)
SECTION 2 DESCRIPTION
NOTE:
Part numbers in parenthesis ap-
ply to "CE" / European units only.
88
SECTION 2 DESCRIPTION
89
SECTION 3 INSTALLATION
Installation
Installing Front End Parts
Make sure power switch on
console is in OFF position and
primary input power is de-en-
ergized.
1. The seat comes assembled to the front end of the torch. IF the seat becomes
damaged, the torch body must be replaced. DO NOT attempt to remove the seat
from torch body.
2. Electrode holder assembly 21332 (4485840) includes the baffle tube 21374
(4485834). If baffle tube becomes damaged, it can be replaced by un-threading the
damaged tube out of the holder. Use small hex end of the wrench 21375 (4485842)
in hex broach on the tube. Tighten tube securely but do not over-tighten.
Electrode Holder Assembly
Baffle Tube
Seat
NOTE:
Part numbers in parenthesis ap-
ply to "CE" / European units only.
WARNING
90
3. Install the electrode insulator 21373 (4485837) onto electrode holder assembly
21332 (4485840) and then thread electrode 21150 (0558004249) onto the electrode
holder assembly. Assemble electrode firmly by hand. Do not use wrenches or pliers.
These three parts combined are the electrode assembly.
4. Install nozzle onto the electrode assembly by inserting small shoulder on elec-
trode insulator into nozzle’s rear opening. Place nozzle and electrode assembly
into the heat shield as shown in Page 6. If front end of the torch is facing down as
normal in a setup, the nozzle and electrode assembly can be stacked in the heat
shield and then assembled to the torch. Be sure to use proper heat shield and
nozzle combination as noted in Page 18.
5. Apply a thin film of lubricant 17672 (0558000443) to o-ring 488157
(4485841).
O-ring
SECTION 3 INSTALLATION
NOTE:
Part numbers in parenthesis ap-
ply to "CE" / European units only.
21332
21373
21150
21332 (4485840)
21373 (4485837)
21150 (0558004249)
91
SECTION 3 INSTALLATION
6.Tighten heat shield fully to hold the parts in firm contact with each other and to
the torch head. “Fully” means at least 4.8mm (0.19") rotation after electrode seat
contacts electrode holder.
To connect PT-20AMX torch to the console, connect the power cable of the torch to
the ‘‘NEG’’ terminal and pilot arc cable to the ‘‘POS’’ terminal of the unit using pilot
arc adaptor (21803 - supplied with spare parts kit). A separate remote control switch
cable is required for connecting to the switch receptacle on the console.
The front end of the torch contains a gas flow check valve that acts in conjunction
with the circuitry provided in the power supply. This patented system provides a safety
interlock preventing the torch from being accidentally energized with high voltage
when the heat shield is removed and the torch switch is accidentally closed.
IMPORTANT:
See Maintenance section.
Follow all instructions in the
booklet packed with your unit.
DO NOT install or attempt to
operate this torch without
following these instructions.
NOTE:
Part numbers in parenthesis ap-
ply to "CE" / European units only.
CAUTION
92
SECTION 3 INSTALLATION
93
SECTION 4 OPERATION
Heat Shield
70/100 amp (blue) - 21326 (4485831)
50 amp (white) - 21447 (4485832)
Baffle Tube - 21374 (4485838)
Electrode Adaptor
Assembly - 21332
(4485840)
Insulator - 21373
(4485837)
Electrode - 21150 (0558004249)
Electrode - 0558001617
Torch Body Assembly - 21359 (4485850)
O-ring - 488157 (4485841)
Cutting Nozzle (see appropriate
spare parts kit for p/n)
PT-20AMX Torch
NOTE: Part numbers in parenthesis apply to "CE" / European units only.
Metal Thick-
ness
Air Pressure Stand-Off Arc Voltage Pierce
Time
Mild Steel Aluminum Stainless
(in.) (mm) psig bar (in.) (mm) DC volts (sec.) ipm mm/m ipm mm/m ipm mm/m
0.25 6 85 6 0.25 6 110 0,1 100 2540 105 2667 80 2032
0.50 13 85 6 0.25 6 120 0,3 45 1143 50 1270 30 762
0.75 19 85 6 0.25 6 125 1,0 27 686 35 889 15 381
1.00 25 85 6 0.25 6 130 2,75 15 381 20 508 10 254
1.25 32 85 6 0.32 8 140 NR 10 254 13 330 7 178
1.50 38 85 6 0.32 8 145 NR 7 178 10 254 5 127
Cutting Parameters for the PT-20AMX Torch
NOTE: Part numbers in parenthesis apply to "CE" / European units only.
100AMP Data, Nozzle P/N 21328 (4485835), Heat Shield P/N 21326 (4485831)
94
SECTION 4 OPERATION
Cutting Parameters for the PT-20AMX Torch
NOTE: Part numbers in parenthesis apply to "CE" / European units only.
“NR” indicates piercing is not recommended
50AMP Data, Nozzle P/N 21330 (4485833), Heat Shield P/N 21447 (4485832)
70AMP Data, Nozzle P/N 21329 (4485834), Heat Shield P/N 21326 (4485831)
Metal Thick-
ness
Air Pressure Stand-Off Arc Voltage Pierce
Time
Mild Steel Aluminum Stainless
(in.) (mm) psig bar (in.) (mm) DC volts (sec.) ipm mm/m ipm mm/m ipm mm/m
0.13 3 75 5 0.19 5 105 0,1 190 4826 180 4572 80 2032
0.25 6 75 5 0.19 5 110 0,2 80 2032 85 2159 55 1397
0.50 13 85 6 0.25 6 115 0,6 30 762 30 762 20 508
0.75 19 85 6 0.25 6 130 2,3 15 381 25 635 8 203
1.00 25 85 6 0.32 8 140 NR 7 178 12 305 6 152
1.25 32 85 6 0.32 8 155 NR 5 127 10 254 3 76
Metal Thick-
ness
Air Pressure Stand-Off Arc Voltage Pierce
Time
Mild Steel Aluminum Stainless
(in.) (mm) psig bar (in.) (mm) DC volts (sec.) ipm mm/m ipm mm/m ipm mm/m
0.06 2 75 5 0.13 3 110 40 150 3810 150 3810 130 3302
0.13 3 75 5 0.13 3 110 40 100 2540 105 2667 75 1905
0.19 5 85 6 0.13 3 110 50 100 2540 90 2286 50 1270
0.25 6 85 6 0.19 5 120 50 65 1651 75 1905 30 762
0.38 10 85 6 0.25 6 130 50 40 1016 30 762 8 203
0.50 13 85 6 0.32 8 150 50 18 457 8 203 6 152
95
SECTION 4 OPERATION
Heat Shield
70/90 amp - 21326 (4485831)
30/50 amp - 21447 (4485832)
Baffle Tube - 21374 (4485838)
Electrode Adaptor
Assembly - 21332
(4485840)
Insulator - 21373
(4485837)
Electrode - 21150 (0558004249)
Torch Body Assembly - 21359 (4485850)
O-ring - 488157 (4485841)
Cutting Nozzle (see appropriate
spare parts kit for p/n)
PT-21AMX Torch
Cutting Parameters for the PT-21AMX Torch
90AMP Data, Nozzle P/N 21328 (4485835), Heat Shield P/N 21326 (4485831)
“NR” indicates piercing is not recommended
Pierce
Time
Metal
Thickness
6
13
19
25
32
38
Air
Pressure
psig
Stand-Off
in.
mm
Arc
Voltage
DC Volts
seconds
0.25
0.50
0.75
1.00
1.25
1.50
bar
mm
in.
85
85
85
85
85
85
5
5
5
6
6
6
.188
.188
.188
.250
.250
.250
6
6
6
6
6
6
Optimum
Mild Steel
Aluminum
Stainless
Maximum
Travel Speed
ipm (mm/min)
ipm (mm/min)
Optimum
Maximum
ipm (mm/min)
ipm (mm/min)
Optimum
Maximum
ipm (mm/min)
ipm (mm/min)
110
120
125
130
140
145
0.1
0.3
1.0
2.75
NR
NR
Metal
Thickness
6
13
19
25
32
38
0.25
0.50
0.75
1.00
1.25
1.50
mm
in.
150
55
25
13
9
5
3810
1397
635
330.2
228.6
127
120
49
22
12
7
3
3175
1549.4
889
508
330.2
254
3048
1244.6
558.8
304.8
177.8
76.2
105
51
31
15
10
7
125
61
35
20
13
10
2667
1295.4
787.4
381
254
177.8
88
37
15
10
7
3
2235.2
939.8
381
254
177.8
76.2
80
31
13
8
5
3
2032
787.4
330.2
203.2
127
76.2
NOTE: Part numbers in parenthesis apply to "CE" / European units only.
96
SECTION 4 OPERATION
Cutting Parameters for the PT-21AMX Torch
Pierce
Time
Metal
Thickness
3
6
13
19
25
32
Air
Pressure
psig
Stand-Off
in.
mm
Arc
Voltage
DC Volts
seconds
.125
.250
.500
.750
1.000
1.250
bar
mm
in.
75
75
85
85
85
85
5
5
5
5
6
6
.188
.188
.188
.188
.250
.250
5
5
6
6
6
6
Optimum
Mild Steel
Aluminum
Stainless
Maximum
Travel Speed
ipm (mm/min)
ipm (mm/min)
Optimum
Maximum
ipm (mm/min)
ipm (mm/min)
Optimum
Maximum
ipm (mm/min)
ipm (mm/min)
105
110
115
125
135
150
0.1
0.2
0.6
2.3
NR
NR
Metal
Thickness
mm
in.
210
101
39
15
7
5
5334
2565.4
990.6
381
177.8
127
190
85
30
13
5
3
5207
2540
990.6
635
304.8
228.6
4826
2159
762
330.2
127
76.2
185
90
31
20
9
5
205
100
39
25
12
9
4699
2286
787.4
508
228.6
127
91
61
23
12
7
3
2311.4
1549.4
584.2
304.8
177.8
76.2
80
55
20
9
6
3
2032
1397
508
228.6
152.4
76.2
“NR” indicates piercing is not recommended
Pierce
Time
Metal
Thickness
2
3
5
6
10
13
Air
Pressure
psig
Stand-Off
in.
mm
Arc
Voltage
DC Volts
seconds
0.063
0.125
0.188
0.250
0.375
0.500
bar
mm
in.
75
75
85
85
85
85
3
3
3
5
5
5
.125
.125
.125
.188
.188
.188
5
5
6
6
6
6
Optimum
Mild Steel
Aluminum
Stainless
Maximum
Travel Speed
ipm (mm/min)
ipm (mm/min)
Optimum
Maximum
ipm (mm/min)
ipm (mm/min)
Optimum
Maximum
ipm (mm/min)
ipm (mm/min)
110
110
110
120
125
135
0
0.1
0.2
0.4
0.6 / NR
0.8 / NR
Metal
Thickness
mm
in.
170
112
111
71
43
21
4318
2844.8
2819.4
1803.4
1092.2
533.4
155
100
102
66
40
18
4089.4
3581.4
2667
2108.2
939.8
330.2
3937
2540
2590.8
1676.4
1016
457.2
150
110
93
77
31
9
161
141
105
83
37
13
3810
2794
2362.2
1955.8
787.4
228.6
141
79
57
37
15
11
3581.4
2006.6
1447.8
939.8
381
279.4
130
75
50
30
10
8
330.2
1905
1270
762
254
203.2
70AMP Data, Nozzle P/N 21329 (4485834), Heat Shield P/N 21326 (4485831)
40/50AMP Data, Nozzle P/N 21330 (4485833), Heat Shield P/N 21447 (4485832)
.125
.250
.500
.750
1.000
1.250
3
6
13
19
25
32
Arc
Current
amps
40
40
50
50
50
50
2
3
5
6
10
13
0.063
0.125
0.188
0.250
0.375
0.500
“NR” indicates piercing is not recommended
NOTE: Part numbers in parenthesis apply to "CE" / European units only.
/