Miller Electric ProHeat 35 manual Removing Wrapper and Measuring Input Capacitor Voltage

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9-7. Removing Wrapper and Measuring Input Capacitor Voltage

Tools Needed:

5/16, 3/8 in

! 900 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.

1

+ lead to right bus terminal,	3
− lead to left bus terminal

! Turn Off welding power source, and disconnect input power.

! Significant 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 right side panel and dis- connect fan motor FM3.

1Current Source Interconnect Board PC4

2Voltmeter

Measure the dc voltage across the

+bus terminal and − bus terminal on PC4 as shown until voltage drops to near 0 (zero) volts.

.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).

3 Typical Bleeder Resistor

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

Proceed with job inside unit. Re- connect FM3 and reinstall right side panel when finished.

Typical Bleeder Resistor

200 to 500 ohm, 10 watt

wire wound resistor

2

#16 AWG 600 Volts AC

Insulation Rating

804 519-B

OM-222 166 Page 46

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Contents Description OM-222 166K 2007−11 ProcessesFile Induction Heating From Miller to You Table of Contents − Maintenance Routine Maintenance Blowing Out Inside Of UnitLimit Conditions Limit Condition Codes Fault Conditions EMF InformationStandards DirectivesDecstat1/07 Page Symbol Usage Induction Heating HazardsElectric Shock can kill Fumes and Gases can be hazardousCalifornia Proposition 65 Warnings Principal Safety Standards EMF Information About Implanted Medical DevicesSignification des symboles − Consignes DE Sécurité − Lire Avant UtilisationUNE Décharge Électrique peut entraîner la mort LES Fumées ET LES GAZ peuvent être dangereuxRisque D’INCENDIE OU D’EXPLO LE Chauffage PAR Induction peut provoquer des brûluresLA Chute DE L’APPAREIL peut blesser DES Organes Mobiles peuvent provoquer des blessuresPrincipales normes de sécurité Information EMF Proposition californienne 65 AvertissementsEn ce qui concerne les implants médicaux − Definitions Shown by the symbols Power before working onAre possible hazards as KillRating Label For CE Products Weee Label For Products Sold Within The EU− Installation Symbols And DefinitionsSpecifications I1maxDo not move or operate unit where it could tip Selecting a LocationTipping Movement Location And AirflowElectrical Service Guide Phase Input Voltage50 Hz Three Min Grounding Conductor Size In AWGConnecting 3-Phase Input Power For 460/575 Volt Models Welding Power Source Input Power ConnectionsDisconnect Device Input Power Connections GND/PE Earth GroundConnecting 3-Phase Input Power For 400/460 Volt Models Power Source Output Connections Remote 14 Socket Information Remote 14 Receptacle RC14 Information and ConnectionsSocket Socket Information Temperature Recorder Socket Information Signal CommonSocket No Socket Information UnusedSecondary Insulation Protection Receptacles PlugHandle Magnet Workpiece Use handle to place magnet on the workpieceVolt AC Duplex Receptacle And Supplementary Protector Locating ThermocouplesOther end is fitted with a 2-pin type K connector Do not weld thermocouples while connected to power source Attaching Welded ThermocouplesUsing Contact Thermocouples Placing Temperature Probe− Components and Controls Controls− Setup and Operation Safety EquipmentPower Source/System Setup System DescriptionOM-222 166 Temperature-Based Control Mode....... Preheat Control TC Temperature Soak TimeDecrease button to change the value to the desired setting ProgrammingBake-Out Pwht Post-Weld Heat TreatSoak Parameters Custom ProgramCustom Program EndType.......Step 600Ramp Temperature 600 Ramp Rate 600 /Hr Number OM-222 166Soak Soak FunctionNumber End FunctionTypical 5-Segment Custom Program Manual ControlSoak at 1250 degrees F for a period Temperature Based Control Run StatusTC5 Target Temp −−−− TC6 Countdown.. −−−−−− Preheat, Bake-Out And Pwht Run Status ScreenPower TC5 Current TC6 Voltage Frequency KHz ParametersCooler Cooler cannot be turned off while output is onReal-Time Operation Must be running to enter Hold modeProgram run is initiated, the Run Button. a change of program parameters System Operating Characteristics Power Source Output CharacteristicsAir Cooled Output Liquid Cooled Output− Maintenance Routine MaintenanceDisconnect power Before maintaining− Safety Precautions for Servicing Servicing HazardsCalifornia Proposition 65 Warnings − Diagnostics & Troubleshooting Operator Interface IndicatorsLimit Conditions Limit Condition CodesRun Status Limit Condition Additional InformationFault Condition Codes Fault ConditionsFault Condition Additional Information Off Cable1 LQD DIAG1 OutI1 Cable2 LQD OutI2 ClntFR 0.75 GPM System Diagnostic ScreensClrSts Flowing Therm1 Therm2Therm3 VBusRemoving Wrapper and Measuring Input Capacitor Voltage Turn Off welding power source, and disconnect input powerTools Needed 16, 3/8 Material Thickness Reference Chart Blowing Out Inside Of Unit− Electrical Diagram Circuit Diagram218 057-G − Parts List See Figure 11-313 11-2Front Panel Rear Panel Base w/Components Top Windtunnel Capacitor Assembly Right Windtunnel 229 Right Windtunnel 400 V Model Only 208 Left Windtunnel PLG14 10. Hermaphroditic Blank Plug Assy SOCKET/WRENCH Selection Table Standard Metric OM-222 166 Your distributor also gives ServiceSupport To locate a Distributor or Service Agency visit Miller Electric Mfg. CoFor assistance in filing or settling claims, contact Your distributor and/or equipment manufacturer’s