Miller Spectrum 300 Owner's Manual
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Miller Spectrum 300 Owner's Manual

50/60 hz
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Amperes Input at
Rated Output,
Single-Phase
Rated Cutting
Rated Cutting
Output
25 A @ 89 Volts DC
At 35% Duty Cycle
*While idling
cover_om 4/95 − ST-801 645
OWNER'S
MANUAL
Spectrum® 300 (50/60 Hz)
For Plasma Arc Cutting (PAC)
50 Hz,
230 V
KVA
17 (0.2*)
4.0 (0.05*)
©
1997 MILLER Electric Mfg. Co.
May 1997
Effective With Serial No. KG198345
KW
Plasma Gas
Air Or Nitrogen
3.1 (0.04*)
Only
Form: OM-182 702
Plasma Gas
Max
Max
Flow/
Flow/
OCV
Pressure
4.5 CFM (129
L/min) At 60 PSI
265 Volts DC
(414 kPa)
PRINTED IN USA

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  • Page 1 25 A @ 89 Volts DC Air Or Nitrogen 17 (0.2*) 4.0 (0.05*) 3.1 (0.04*) L/min) At 60 PSI 265 Volts DC At 35% Duty Cycle Only (414 kPa) *While idling © cover_om 4/95 − ST-801 645 1997 MILLER Electric Mfg. Co. PRINTED IN USA...

  • Page 3: Section 1 − Safety For Plasma Arc Cutting

    SECTION 1 − SAFETY FOR PLASMA ARC CUTTING OM-182 702 − safety_pom1 4/95 5/97 1-1. Symbol Usage Y Marks a special safety message. Means Warning! Watch Out! There are possible hazards with this procedure! The possible hazards are shown in the adjoining symbols. Means NOTE;...

  • Page 4: Fumes And Gases

    ARC RAYS can burn eyes and skin. NOISE can damage hearing. Arc rays from the cutting process produce intense Prolonged noise from some cutting applications can visible and invisible (ultraviolet and infrared) rays damage hearing if levels exceed limits specified by that can burn eyes and skin.

  • Page 5: High-Frequency Radiation

    FIRE OR EXPLOSION can result from HIGH-FREQUENCY RADIATION placing unit over, near interfere with radio navigation, safety combustible surfaces. services, computers, communications equipment. 1. Do not locate unit on, over, or near combustible surfaces. 1. Have only qualified persons familiar with electronic equipment perform this installation.

  • Page 6: Section 2 − Installation

    SECTION 2 − INSTALLATION 2-1. Selecting A Location 6-3/4 in (171 mm) Dimensions And Weight 42 lb (19.1 kg) 17 in (432 mm) 18 in (457 mm) Movement Lifting Handle Y Do not move or operate unit Use handle to lift unit. where it could tip.

  • Page 7: Connecting Work Clamp And Gas/Air Supply

    2-2. Connecting Work Clamp And Gas/Air Supply Work Clamp Workpiece Connect work clamp to a clean, paint-free location on workpiece, as close to cutting area as possible. Use only clean, dry air with 70 to 150 psi (483 to 1034 kPa) pressure.

  • Page 8: Section 3 − Operation

    SECTION 3 − OPERATION 3-1. Controls Setting Gas/Air Pressure Set To 60 PSI (414 kPa) Requires 70-150 PSI (483-1034 kPa) Supply Power Switch Ready Light Setting Gas/Air Pressure Power Light Air Filter/Regulator Use light to tell if unit is ready for operation. Output Control Pressure Adjustment Knob Ready light comes on when Power switch is...

  • Page 9: Symbols And Definitions

    3-2. Symbols And Definitions Plasma Arc Cutting Adjust Air/Gas Amperes Air Pressure (PAC) Pressure No − Do Not Do Volts Increase Temperature This Protective Earth Loose Shield Cup Input Voltage Input (Ground) Loose Shield Cup 3-3. Duty Cycle And Overheating Duty Cycle is percentage of 10 min- utes that unit can cut at rated load without overheating.

  • Page 10: Section 4 − Maintenance & Troubleshooting

    SECTION 4 − MAINTENANCE & TROUBLESHOOTING 4-1. Routine Maintenance Maintain more often Y Disconnect power during severe conditions. before maintaining. Each Use Check Check Torch Tip, Gas/Air Electrode, Pressure And Shield Every Week Check Shield Cup Shutdown System 3 Months Replace Service Damaged Or...

  • Page 11: Overload Protection: Trouble Lights & Checking Shield Cup Shutdown System

    4-2. Overload Protection: Trouble Lights & Checking Shield Cup Shutdown System If certain problems occur, the Ready light goes off, a trouble light comes on, and output stops. Pressure Light Lights if gas/air pressure is below 40 PSI (276 kPa). Turn power Off, and check for prop- er gas/air pressure (see Section 3-1).

  • Page 12: Torch And Work Cable Connections

    4-3. Torch And Work Cable Connections If torch or work cable needs to be removed or replaced, proceed as follows: Turn power Off, and disconnect in- put power plug from receptacle. Re- move top and screws holding front panel in place. Without disconnect- ing any plugs, move front panel to allow access.

  • Page 13: Troubleshooting

    4-4. Troubleshooting Trouble Remedy No pilot arc; difficulty in establishing an Clean or replace worn consumables as necessary (see torch Owner’s Manual). arc. Check for damaged torch or torch cable (see torch Owner’s Manual). Have Factory Authorized Service Agent check control relay CR6, power control board PC1, safety con- trol board PC2, gas valve GS1, rectifier SR1, and check gas/air system for leaks.

  • Page 14: Section 5 − Electrical Diagram

    SECTION 5 − ELECTRICAL DIAGRAM SC-182 866 Figure 6-1. Circuit Diagram For Power Source OM-177 545 Page 12...
  • Page 15 NOTES OM-182 702 Page 13...

  • Page 16: Section 6 − Parts List

    SECTION 6 − PARTS LIST ST-801 644 Figure 6-1. Main Assembly OM-182 702 Page 14...
  • Page 17 Item Dia. Part Mkgs. Description Quantity Figure 6-1. Main Assembly ....175 055 COVER, top ........... . .
  • Page 18 ....181 708 ..GASKET, switch ..........Item Dia.
  • Page 19 Effective January 1, 1997 (Equipment with a serial number preface of “KH” or newer) This limited warranty supersedes all previous Miller warranties and is exclusive with no other guarantees or warranties expressed or implied. LIMITED WARRANTY − Subject to the terms and conditions APT, ZIPCUT &...

  • Page 20: Owner's Record

    Welding Process Handbooks Contact the Delivering Carrier for: File a claim for loss or damage during shipment. For assistance in filing or settling claims, contact your distributor and/or equipment manufacturer’s Transportation Department. © PRINTED IN USA 1997 Miller Electric Mfg. Co.

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