HTP MicroCut 875S Manuale utente

MicroCut 875S

Index

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Plasma/Cooling Gas Connection . . . . . . . . . . . . . . . . . . 7

Electrical Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

MicroCut 875S Controls . . . . . . . . . . . . . . . . . . . . . . . . . 8

Ground Cable Connection . . . . . . . . . . . . . . . . . . . . . . . . 9

Plasma Torch Connection . . . . . . . . . . . . . . . . . . . . . . . . 9

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Maintenance and Service . . . . . . . . . . . . . . . . . . . . . . . . 10

Cutting Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

MicroCut 875S Plasma Torch Parts Breakdown . . . . . . . 12

MicroCut 875S Parts Breakdown . . . . . . . . . . . . . . . . . . 13-16

Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Introduction

Congratulations on your purchase of an HTP America Micro Cut 875S Air Plasma

Cutting System. Your purchase of a Micro Cut 875S means you have purchased one

of the most technologically advanced, safest and economical plasma cutters

available today.

The owner's manual has been designed to instruct you on the safe operation of your

Micro Cut 875S. If you read and follow the instructions in this manual, your plasma

cutter will provide you with years of trouble free operation. If you fail to read and

understand this manual, as well as correctly follow the operating instructions, you

will significantly shorten the operating life of your plasma cutter.

Operation of your plasma cutting system without proper understanding of the facts

contained within this manual or under unsafe or hazardous conditions, may lead to

SERIOUS INJURY OR DEATH!

of repair or replacement will be F.O.B., Factory at

Arlington Heights, Illinois, therefore; no

compensation for transportation costs of any kind

will be allowed. Upon receipt of notice of apparent

defect or failure, HTP shall instruct the claimant on

the warranty claim procedures to be followed.

HTP America, Inc. has reserved the right to make

changes in design or add any improvements to its

products at any time without incurring any obligation

to install same on equipment.

This warranty is null and void unless warranty card

is sent to HTP America, Inc. within 15 days from

date of purchase.

ANY EXPRESS WARRANTY NOT PROVIDED

HEREIN AND ANY IMPLIED WARRANTY,

GUARANTY OR REPRESENTATION AS TO

PERFORMANCE, AND ANY REMEDY FOR

BREACH OF CONTRACT WHICH, BUT FOR

THIS PROVISION, MIGHT ARISE BY

IMPLICATION, OPERATION OF LAW, CUSTOM

OF TRADE OR COURSE OF DEALING,

INCLUDING ANY IMPLIED WARRANTY OF

MERCHANTABILITY OR OF FITNESS FOR

PARTICULAR PURPOSE, WITH RESPECT TO

ANY AND ALL EQUIPMENT FURNISHED BY

HTP IS EXCLUDED AND DISCLAIMED BY HTP.

FOR THIS PROVISION, MIGHT ARISE BY

IMPLICATION, OPERATION OF LAW, CUSTOM

OF TRADE OR COURSE OF DEALING,

INCLUDING ANY IMPLIED WARRANTY OF

MERCHANTABILITY OR OF FITNESS FOR

PARTICULAR PURPOSE, WITH RESPECT TO

ANY AND ALL EQUIPMENT FURNISHED BY

HTP IS EXCLUDED AND DISCLAIMED BY HTP.

Limited Warranty

Subject to the terms and conditions hereof, HTP

warrants to its Distributor/Dealer that all MicroCut

875S Plasma Cuffers furnished by HTP are free from

defect in workmanship and material as of the time

and place of delivery by HTP. No warranty is made

by HTP with respect to trade accessories or other

items manufactured by others. Such trade

accessories and other items are sold subject to the

warranties of their respective manufacturers, if any.

HTP shall be required to honor warranty claims on

MicroCut 875S Plasma Cuffers in the event of failure

resulting from a defect within the following periods

from the date of delivery of MicroCut 875S to the

original user:

1. Plasma cutters, power sources and

components: 2 years.

2. All plasma torches: 90 days.

3. The electrode, cutting nozzle,

insulator, spring, and gas

diffuser are consumable

items, WHICH CARRY NO WARRANTY.

provided that HTP is notified in writing within thirty

(30) days of the date of such failure.

As a matter of general policy only, HTP may honor

claims submitted by the original user within the

foregoing periods.

In the case of HTP's breach of warranty or any other

duty with respect to the quality of any goods, the

exclusive remedies therefore shall be, at HTP's option

(1) repair or (2) replacement or, where authorized in

writing by HTP in appropriate cases, (3) the

reasonable cost of repair or replacement at an

authorized HTP service station upon return of the

goods at Customer's risk and expense. HTP's option

Safety Precautions

Plasma Arc Cutting Hazards

▲ The safety information given below is only a summary of

the more complete safety information found in the Safety

Standards listed in Section M. Read and follow

all Safety Standards.

▲ Only qualified persons should install, operate,

maintain, and repair this unit.

▲ During operation, keep everybody, especially children, away.

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Hot metal and sparks blow out from the plasma cutting

arc. The flying sparks and hot metal, hot work pieces,

and hot equipment can cause fires and burns. Check

and be sure the area is safe before doing any cutting.

Protect yourself and others from flying sparks and hot metal.

Do not cut where flying sparks can strike flammable material.

Remove all flammables within 35 ft of the plasma cutting arc.

If this is not possible, tightly cover them with approved

covers.

Be alert that sparks and hot materials from cutting can easily

go through small cracks and openings to adjacent areas.

Watch for fire, and keep a fire extinguisher nearby.

Be aware that cutting on ceiling, floor, bulkhead, or partition

can cause fire on the opposite side.

Connect ground cable to the work as close to cutting area as

practical to prevent cutting current from traveling long,

possibly unknown paths and causing electric shock and fire

hazards.

Do not cut pressurized cylinders, pipes, or vessels.

Do not cut on closed containers such as tanks or drums.

Never cut containers with potentially flammable materials

inside- they must be emptied and properly cleaned first.

Do not cut containers that have held combustibles.

Do not cut in atmospheres containing explosive dust or

vapors.

Wear oil-free protective garments such as leather gloves,

heavy shirt, cuffless trousers, high shoes, and a cap.

Do not locate unit on or over combustible surfaces.

Remove any combustibles, such as butane lighter or matches

from your person before doing any cutting.

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Touching live electrical parts can cause fatal shocks or

severe burns. The plasma torch and circuit are

electrically live whenever the output is on. The input power

circuit and machine internal circuits are also live when power is

on. Plasma arc cutting requires higher voltages than welding to

start and maintain the arc (100 -300 volts dc are common), but

also uses torches designed with safety interlock systems which

turn off the machine when the shield cup is loosened or if tip

touches electrode inside the nozzle. Incorrectly installed or

improperly grounded equipment is a hazard.

Do not touch live electrical parts.

Wear dry, hole-free insulating gloves and body protection.

Insulate yourself from work and ground using dry insulating

mats or covers big enough to prevent any physical contact

with work or ground.

Do not touch torch parts if in contact with the work or ground.

Turn off power before checking, cleaning, or changing torch parts.

Disconnect input power before servicing this equipment.

Lockout/tagout input power according to OSHA CFR

1910.147

Properly install and ground this equipment according to the

Owner’s Manual and national, state, and local codes.

Check and be sure that input power cord ground wire is

properly connected to ground terminal in disconnect box or

that cord plug is connected to properly grounded receptacle

outlet-always verify the supply ground.

When making input connections, attach proper grounding

conductor first.

Frequently inspect input power cord, plasma torch and ground

cable for damage or bare wiring. Replace cord immediately if

damaged. Bare wiring can kill.

Turn off all equipment when not in use.

Do not wrap torch cable around your body.

Ground the work piece to a good electrical (earth) ground if

required by codes.

Use only well-maintained equipment. Repair or replace

damaged parts at once.

Wear a safety harness if working above floor level.

Keep all panels and covers securely in place.

Do not bypass or try to defeat the safety interlock systems.

Use only the Plasma Torch specified in the Owner’s Manual.

Keep away from torch tip and pilot arc when the plasma torch

trigger is pressed.

Clamp work cable with good metal-to-metal contact to work

piece (not piece that will fall away) or worktable as near the

cut as practical.

Insulate work clamp when not connected to work piece to

prevent contact with any metal object.

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Turn Off unit, disconnect input power, check voltage on input

capacitors, and be sure it is near zero (0) volts before

touching any parts. Check capacitors according to

instructions in Maintenance Section of Owner’s Manual or

Technical Manual before touching any parts.

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On inverter power sources, failed parts can

explode or cause other parts to explode

when power is applied. Always wear a face

shield and long sleeves when servicing inverters.

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Sparks and hot metal blow out from the cutting arc.

Chipping and grinding cause flying metal.

Wear approved face shield or safety goggles with side shields.

Wear proper body protection to protect skin.

Wear flame-resistant ear plugs or ear muffs to prevent sparks

from entering ears.

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Arc rays from the cutting process produce intense

visible an invisible (ultraviolet and infrared) rays that

can burn eyes and skin.

Wear face protection (helmet or shield) with correct shade of

filter to protect your face and eyes when cutting or watching.

ANSI Z49.1 (see Safety Standards) suggests No. 9 shade

(with No. 8 as minimum) for all cutting currents less than 300

amperes. Z49.1 adds that lighter filter shades may be used

when the arc is hidden by the work piece. As this is normally

the case with low current cutting, the shades suggested in

Table 1 are provided for the operator’s convenience.

Wear approved safety glasses with side shields under your

helmet or shield.

Use protective screens or barriers to protect other form flash

and glare; warn others not to watch the arc.

Wear protective clothing made from durable, flame-resistant

material (leather and wool) and foot protection.

Table 1. Eye Protection for Plasma Arc Cutting

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Cutting produces fumes and gases. Breathing these

fumes and gases can be hazardous to your health.

Keep your head out of the fumes. Do not breathe the fumes.

If inside, ventilate the area and/or use exhaust at the arc to

remove cutting fumes and gases.

If ventilation is poor, use an approved air-supplied respirator.

Read the Material Safety Data Sheet (MSDS) and the

manufacturer’s instruction for metals to be cut, coating, and

cleaners.

Work in a confined space only if it is well ventilated, or while

wearing an air-supplied respirator. Fumes from cutting and

oxygen depletion can alter air quality causing injury or death.

Be sure the breathing air is safe.

Do not cut in locations near degreasing, cleaning, or spraying

operations. The heat and rays of the arc can react with vapors

to form highly toxic and irritating gases.

Do not cut on coated metals, such as galvanized, lead, or

cadmium plated steel, unless the coating is removed from the

cutting area, the area is well ventilated, and if necessary,

while wearing an air supplied respirator. The coatings and any

metals containing these elements can give off toxic fumes

when cut.

Do not cut containers with toxic or reactive materials inside

or containers that have held toxic or reactive material-they

must be emptied and properly cleaned first.

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The heat from the plasma arc can cause serious burns.

The force of the arc adds greatly to the burn hazard.

The intensely hot and powerful arc can quickly cut

through gloves and tissue.

Keep away from the torch tip.

Do not grip material near the cutting path.

The pilot arc can cause burns-keep away from torch tip when

trigger is pressed.

Wear proper flame-retardant clothing covering all exposed

body areas.

Point torch away from your body and toward work when

pressing the trigger. Caution - pilot arc comes on immediately.

Turn off power source and disconnect input power before

disassembling torch or changing torch parts.

Use only the plasma torch specified in the Owner’s Manual.

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Gas cylinders contain gas under high pressure. If

damaged, a cylinder can explode. Since gas cylinders

are normally part of metalworking processes, be sure

to treat them carefully.

Protect compressed gas cylinders from excessive heat,

mechanical shocks, slag, open flame, sparks, and arcs.

Install and secure cylinders in an upright position by chaining

them to a stationary support or equipment cylinder rack to

prevent falling or tipping.

Keep cylinders away from any cutting or other electrical circuits.

Safety and Health Standards, OSHA 29 CFR 1910, from

Superintendent of Documents, U.S. government Printing Office,

Washington, D.C. 20402.

Recommended Practices for Plasma Arc Cutting, American

Welding Society Standard AWS C5.2 from American Welding

Society, 550 N.W. LeJeune Rd, Miami, FL 33126

National Electrical Code, NFPA Standard 70, from National

Fire Protection Association, Batterymarch Park, Quincy, MA

02269

Safe Handling of Compressed Gases in Cylinders, CGA

Pamphlet P-1, from Compressed Gas Association, 1235

Jefferson Davis Highway, Suite 501, Arlington, VA 22202

Code for Safety in Welding and Cutting, CSA standard W117.2

from Canadian Standards Association, Standards Sales, 178

Rexdale Boulevard, Rexdale, Ontario, Canada M9W 1R3.

Safe Practices for Occupation and Educational Eye and Face

Protection, ANSI Standard Z87.1, from American National

Standards Institute, 1430 Broadway, New York, NY 10018

Cutting and Welding Processes, NFPA Standard 51B, from

National Fire Protection Association, Batteymarch Park, Quincy,

MA 02269.

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Considerations about Welding or Cutting and the Effects of Low

Frequency Electric and Magnetic Fields.

Welding or cutting current, as it flows through the welding or

cutting tables, will cause electromagnetic fields. There has been

and still is some concern about such fields. However, after

examining more than 500 studies spanning 17 years of research,

a special blue ribbon committee of the Nation Research

Council concluded that: “The body of evidence, in the

committee’s judgment, has not demonstrated that exposure to

power-frequency electric and magnetic fields is a human health

hazard.” However studies are still going forth and evidence

continues to be examined. Until the final conclusions of the

research are reached, you may wish to minimize your exposure

to electromagnetic fields when welding or cutting.

To reduce magnetic fields in the work place, use the following

procedures:

1. Keep cables close together by twisting or taping them.

2. Arrange cables to one side and away from the operator.

3. Do not coil or drape cables around your body.

4. Keep cutting power source and cables as far away from

operator as practical.

5. Connect work clamp to work piece as close to the cut as

possible.

About Pacemakers:

Pacemaker wearers consult your doctor first. If cleared by your

doctor, then following the above procedures is recommended.

Never allow electrical contact between a plasma arc torch

and cylinder.

Never cut on a pressurized cylinder. Explosion will result.

Keep protective cap in place over valve except when cylinder

is in use or connected for use.

Read and follow instructions on compressed gas cylinders,

associated equipment, and CGA publication P-1 listed in

Safety Standards.

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Do not touch hot parts bare handed.

Allow a cooling period before disassembling the plasma torch.

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Wear safety glasses with side shields or face shield.

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Pacemaker wearers keep away.

Wearers should consult their doctor before going near

plasma arc cutting operations.

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Allow cooling period; follow rated duty cycle.

Reduce amperage (thickness) or reduce duty cycle

before staring to cut again.

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When cutting aluminum underwater or with the

water touching the underside of the aluminum, free

hydrogen gas may collect under the work piece.

See your cutting engineer and water table instructions for

help.

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Electromagnetic energy can interfere with sensitive

electronic equipment such as computers and computer-

driven equipment such as robots.

To reduce possible interference, keep cables as short as

possible, close together, and down low, such as on the floor.

Locate cutting operation 300 feet from any sensitive

electronic equipment.

Be sure this cutting power source is installed and grounded

according to manual.

If interference still occurs, the user must take extra measures

such as moving the machine, using shielded cables, using

line filter, or shielding the work area.

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Safety in Welding and Cutting, ANSI standard A49.1 from

American Welding Society, 550 N.W. LeJuene Rd, Miami FL 33126

Inspection

After removing your plasma cutter from its shipping carton,

inspect the plasma cutter for any concealed damage not seen

upon receiving the unit. Any claims for loss or damage

occurring during shipping must be filed by the purchaser with

the freight company.

Check the inlet air supply at the rear of the cabinet to be sure no

packing materials have gotten inside to obstruct the air flow to

the plasma torch.

Plasma/Cooling Gas Connection

Your Micro Cut 875S has been designed to use clean, dry

compressed air as both the plasma and cooling gas. Water

and/or oil in the air will significantly reduce the life of the

electrode and the cutting nozzle, at the same time reducing the

quality of the cut.

Safety sensing circuitry has been installed to eliminate arc-

initiation if the pressure and volume are inadequate. The filter

regulator is mounted on the back of your Micro Cut 875S. The

inlet to the regulator is a standard 1/4” NPT female thread.

Install a quick disconnect fitting which is compatible with your

air line in the regulator.

Plasma/Cooling Gas Pressure Volume

70 psi 3.2 cfm

To correctly set the air pressure, depress the purge button on the

front of your Micro Cut 875S. While the air is flowing, lift up

on the regulator adjusting knob, and set the air pressure to 70

psi. Push the regulator adjusting knob down to lock when

finished.

Damage to your plasma cutter due to excessive water and/or oil

in the air supply line is not covered under warranty. Your Micro

Cut 875S comes equipped with a regulator/filter. In addition,

HTP has 2 filters available for removing any impurities from the

air. If you already have a drier on your compressor, we

recommend the HTP Super Dry (Part # 25300) which is a

disposable in-line filter. This filter uses a desiccant to

completely remove all moisture from the air. The desiccant is

blue when new and turns clear when the filter needs to be

discarded.

If you do not have a drier on your compressor, we strongly

recommend the HTP Max Dry (Part # 25310). This is a 3 stage

filter which

completely removes

all oil and water

from the air. The

first stage of the

Max Dry removes

the water which is

present in the air.

The second stage of

the filter removes

any oil which may

be in the air along

with particulate down to .03 microns. The final stage is the

desiccant drier, which removes the humidity from the air. The

desiccant in the final stage is reusable. It is blue when it is

fresh, and changes to pink when it has absorbed moisture. Just

put the pink desiccant in the oven to bake the moisture out and

reuse. This filter extends the life of your air tools and is great

for painting also.

WARNING: Check the air regulator set every day for

proper pressure, volume and water/oil levels.

Electrical Connection

All electrical connections should be performed by a qualified

electrician in accordance with the National Electrical Code and

local codes and ordinances. When connecting your plasma

cutter, the yellow-green wire MUST BE CONNECTED TO

GROUND, OR SERIOUS INJURY OR DEATH MAY

RESULT!

ELECTRICAL SHOCK CAN KILL! Do not connect an

input wire to the ground terminal. Do not connect the ground

(yellow-green or green) wire to an input (hot) line terminal.

It is also strongly recommended that a fusible line disconnect

switch be installed in the input power circuit to the plasma

machine. This would provide a safe and easy method to remove

all electrical power from your plasma system whenever it is

necessary to perform internal inspection or servicing.

BEFORE ATTEMPTING TO MAKE ANY PRIMARY POWER

CONNECTIONS TO YOUR PLASMA CUTTER, BE SURE

THAT ALL POWER IS OFF BY OPENING THE LINE

DISCONNECT SWITCH.

Your MicroCut 875S has been designed to operate from 220 volt

single phase power wired for a minimum of 42 amps. The green

or yellow-green wire must be connected to ground. The blue

and brown wires must be connected to the hot legs of the 220-

volt power.

Fig.1

#25300

HTP Super Dry

Fig.2 #25300

HTP Super Dry

FRONT PANEL COMNTROLS

1) Input Power Light

2) Air Pressure Light

3) Thermo Switch Light

4) Safety Alarm

5) Cutting Power Adjustment

6) Reset Switch

7) Gas Purge Switch

8) Main Power Switch

9) Expanded Metal Switch

10) Plasma Torch Connection

11) Ground Cable Connection

Fig. 3

Micro Cut 875S Controls

1) INPUT POWER LIGHT - when the machine

is correctly connected to a 220 volt input power

supply, and the Main Power Switch (#8) is turned

on, a green light will be illuminated, indicating your

Micro Cut 875S is connected to the correct power

supply.

2) AIR PRESSURE LIGHT - when the machine

is correctly connected to an air supply and the

regulator adjusted so the air pressure gauge reads

above 40 psi, the green air pressure light will be

illuminated. If the pressure falls below 40 psi, the

green air pressure light will go out, and the Safety

Alarm light will turn red.

It is important that the air pressure is set to 70 psi for

the correct operation of the machine with the air

pressure flowing.

3) THERMO SWITCH LIGHT - if the duty

cycle of the machine is exceeded (40% at 60 amps)

the yellow thermo switch light will be illuminated. If

this happens, leave the machine on so the cooling fan

will continue to run, cooling the machine. When the

machine has cooled down, the yellow light will go

out.

4) SAFETY ALARM LIGHT - this lamp will

illuminate red when the machine is first turned on.

Pressing the reset button (# 6) turns the red Safety

Alarm light off. If the red trouble light remains on,

either the plasma torch is not installed correctly on

the machine, the consumable parts are not installed

correctly on the plasma torch or the air pressure is

below 40 psi.

5) CUTTING POWER ADJUSTMENT - the

cutting power adjustment controls the cutting

amperage of your Micro Cut 875S. It is infinitely

variable from 30 to 55 amps. At the lower power

settings, the machine will throw fewer sparks - but

will also cut slower. The maximum cutting power

will give you the maximum cutting speed through all

materials.

You can do drag cutting (resting the plasma torch on

the work) when the amperage is set to 40 amps or

less with the deflector and the 40 amp tip installed in

the machine. For drag cutting over 40 amps, the drag

shield cap and 60 amp cutting tip should be used.

6) RESET SWITCH - when the machine is

turned on for the first time, the red trouble light will

be illuminated. If the machine is connected to the

correct power source, the correct air supply, and the

torch is installed correctly; depressing the reset

button will turn off the red trouble light and allow

you to begin cutting.

7) GAS PURGE SWITCH - the gas purge

switch allows you to purge air through the torch,

allows you to manually cool the cutting torch after

long periods of cutting, and allows you to set the air

pressure while the air is flowing through the plasma

torch.

To purge the torch, simply press the gas purge

button. Air will start to flow. The air will stop

flowing automatically.

8) MAIN POWER SWITCH – Turning the main

power switch will supply 230 volt power to your

Micro Cut 875S. When you are finished operating

the machine, turn the power switch off.

9) MANUAL/AUTOMATIC CUTTING

SWITCH - The manual/automatic selection switch

allows you to select between manual cutting and

automatic cutting. In the manual mode, when the

plasma arc loses contact with the material being cut,

the arc will extinguish. To reestablish the arc, the

trigger must be released and then depressed. The arc

will then ignite. Manual cutting is designated by the

solid line, or the upper switch position.

In the Automatic Cutting mode, the machine will

automatically re-start the arc if contact is lost with

the metal. This setting is good if you are trying to cut

expanded metal. The Automatic mode is designated

by the dashed line, or the lower position.

We recommend leaving the machine in the manual

setting unless there is some need to have the arc

automatically ignite once contact is lost with the

metal.

10) PLASMA TORCH CONNECTION - the

central adapter block is where the plasma torch

connects to the front of your Micro Cut 875S. Your

machine will not operate without the torch properly

connected. (see page 5 - plasma torch connection)

11) GROUND CABLE CONNECTION - this is

where the ground cable connects to the front of your

Micro Cut 875S. Align the tab on the ground clamp

with the notch in the connection. Insert the ground

clamp and twist to lock in place. Be sure to connect

the ground clamp to a clean freshly ground off spot

on the work piece.

Ground Cable Connection

Assemble the ground cable as shown in Figure 3. The ground

cable is connected to the front (See Fig 3, #11) of the machine.

Plug the cable into the receptacle and twist clockwise until

tight.

Connect the ground clamp as close to the workpiece as

possible. This will reduce the possibility of current loss

through stray paths. Always connect the clamp to clean, bare

metal. Do not connect the ground clamp to the piece which

will be cut off.

Plasma Torch Connection

Disconnect power from the machine. The plasma cutting torch

on your Micro Cut 875S is a quick-disconnect design, allowing

you to easily remove and install the cutting torch without any

tools. This makes it very easy to transport your machine or

service the cutting torch.

To install the cutting torch, insert the copper plug into the center

of the adapter block mounted on the front of the plasma cutter.

(See Fig 3, #10)Rotate the plasma torch until the male plastic

tab on the plasma torch fits into the cutout on the bottom of the

adapter block. Firmly push the plasma torch into the adapter

block and secure it by tightening the adapter nut until snug.

Operation

1. Be sure your Micro Cut 875S is connected to a clean, dry

source of compressed air with a line pressure of at least 80

but not more than 140 psi.

2. Connect your Micro Cut 875S to a 230 volt power supply.

(see electrical connection). Turn the On-Off switch on. The

green 230 V light and the green air pressure light will turn on.

The fan will begin to run. The red trouble light will be on.

Press the reset switch to turn the trouble light off.

3. Refer to the safety suggestions to be sure the operator has

the correct eye protection, gloves, clothing, and that all of the

safety precautions have been followed.

4. Place the cutting torch on the edge of the material to be

cut. Depress the trigger on the cutting torch. Pre-air flowwill

occur for about 1/2 second. The pilot arc will start

immediately after that. Once themain arc is established,

KEEPTHE PLASMA TORCH IN CONTACT WITH THE

WORKPIECE if you are using the drag cutting tip. Adjust

the cutting speed based on the thickness and type of material

you are cutting. Hold the plasma torch perpendicular to the

work. Move the plasma torch at a speed which keeps the

plasma arc bent anywhere from 5 to 15 degrees. (See Fig 4).

When you release the trigger, the arc will stop, but air will

continue to flow for about 30 seconds to cool the plasma

torch. When using the drag cutting tip, the highest cutting

efficiency is achieved by keeping the plasma cutting tip

perpendicular and in contact with the work surface putting

very little downforce on the plasma torch. If you move too

fast, sparks will shoot up and you will not cut all the way

through the work. If you are cutting correctly all the plasma

sparks will go beneath the panel you are cutting.

Fig. 4

5. When piercing a thicker sheet of steel (1/4” and greater)

hold the torch at approximately a 45 degree angle and

gradually roll the torch until it is perpendicular to the work

piece (See Fig. 5) If the torch is held perpendicular to the

work to start, there will be no where for the slag to flow, and it

will come straight up and damage the gas diffuser, cutting tip,

and electrode.

Fig. 5

WARNING: Never disassemble the cutting torch unless the

machine has been disconnected from its power supply.

Maintenance and Service

Always disconnect the machine from the main power source

before performing any maintenance or service work.

Consumable Parts:

1. Check nozzle and electrode often for excessive wear due to

cutting. The electrode will develop a pit in the center of it. When

the pit reaches approximately 1/16" deep, the electrode should

be replaced. (See Fig. 6)

Fig. 6

Likewise, when the hole in the center of the cutting tip becomes

enlarged to approximately 1/16" in diameter, the cutting

efficiency will be reduced and the cutting tip should be

replaced. (See Fig. 7)

Indice

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