Miller Electric 375 X-TREME, ICE-27T manual DC Bus Voltage Check

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.A complete Parts List is available at www.MillerWelds.com

6-4. DC Bus Voltage Check

Y440 Volts DC can be present on the capacitor bus and significant DC voltage can remain on capacitors after unit is Off. Always check the voltage on inverter assembly as shown to be sure the input capacitors have discharged before working on unit.

2

1

5

YTurn Off welding power source, and disconnect input power.

YSignificant DC voltage can remain on capacitors after unit is Off. Always check the voltage as shown to be sure the input capacitors have discharged before working on unit.

Remove wrapper from unit (see Section 6-3).

1Circuit Board PC1

2Voltmeter

3TP5 Pin 5

4TP5 Pin 1

YCheck DC bus voltage before servicing. Set multimeter to read voltage. Check voltage between TP5 pins 1 and 5. Volt- age should read 5 volts DC or less.

.If the capacitor voltage does not drop to near zero after several minutes, use a bleeder resistor of between 200 and 500 ohms, at least 10 watts, and #16 AWG 600 volts ac in- sulation rated wire to discharge the capacitor(s).

5 Typical Bleeder Resistor

An example of a typical bleeder resistor is shown on this page.

Proceed with job inside unit. Reinstall wrapper when finished.

Typical Bleeder Resistor

200 to 500 ohm, 10 watt

wire wound resistor

#16 AWG 600 Volts AC

Insulation Rating

Tools Needed:

Torx 25

Ref. 804 506-B

OM-225 216 Page 20

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Contents OM-225 216F ProcessesDescription File Plasma CuttersFrom Miller to You Table of Contents Page Symbol Usage Marks a special safety messagePlasma Arc Cutting Hazards Cutting can cause fire or explosionExploding Parts can injure Flying Sparks can cause injuryARC Rays can burn eyes and skin Noise can damage hearingCalifornia Proposition 65 Warnings Principal Safety Standards EMF InformationAbout Pacemakers Signification des symboles LE Coupage présente un risque de feu ou d’explosionUNE Décharge Électrique peut entraîner la mort Identifie un message de sécurité particulierRisque de blessure en cas LE Bruit peut endommager l’ouïeLES Fumées ET LES GAZ peuvent être dangereux LE Plasma D’ARC peut entraîner des blessuresDES Pieces Chaudes peuvent pro- voquer des brûlures graves DES Organes Mobiles peuvent provoquer des blessuresLA Chute DE L’APPAREIL peut blesser Risque D’INCENDIE OUPrincipales normes de sécurité Information sur les champs électromagnétiquesLE Coupage Ã L’ARC peut causer des interférence Consignes relatives aux stimulateurs cardiaquesSymbols And Definitions SpecificationsSpecifications For Torch Power Source Dimensions And Weight Torch Dimensions And WeightDuty Cycle And Overheating Connecting Gas/Air Supply Connecting Work ClampElectrical Service Guide For 240 VAC Extension Cord Data60 Hz Input Voltage 240 Input Amperes At Rated OutputConnecting 1-Phase Input Power For 240 VAC Connecting Input Power 460 mm− Operation ControlsTrigger Safety Lock Cutting SpeedWhen trigger is pressed Sequence Of OperationExample Of Cutting Operation Pilot arc starts immediatelyRoutine Maintenance Overload ProtectionWrapper Removal Turn OffWrapper Check Bus Removing wrapper Wrapper Torx Screws Fine ThreadDC Bus Voltage Check Checking Or Replacing Filter Element Checking Torch Shield Cup Shutdown System Shield CupTurn Off power source before checking torch parts Checking/Replacing Retaining Cup, Tip, And ElectrodeTorch And Work Cable Connections Torch ConnectionsWork Cable Connections OM-225 216 − Electrical Diagram 224 682-B Recommended Spare Parts Recommended Spare PartsOM-225 216 Page Service SupportOwner’s Record Miller Electric Mfg. Co