Lincoln Electric SVM149-A service manual Fan

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F-19		TROUBLESHOOTING & REPAIR	F-19

INPUT BOARD VOLTAGE TEST (CONTINUED)

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10.After the relays activate check for 115VAC from both test points AC to CP. See Figure F.7. If this voltage is not present or low, the relay contacts may be defective.

11.Check the fan voltage at the fan terminals (V1 & V2). See Figure F.7 Normal is 230VAC. If this voltage is normal (230VAC) the primary circuit of the auxiliary transformer is operating correctly.

12.Check for the presence of approximately 15VAC at pins 1 and 2 of plug CN1. See Figure F.7.

13.With the torch consumables in place (nozzle, electrode and shield) check for the presence of approximately 6VDC at pins 3(-) and 4(+) of plug CN1. See Figure F.7.

Note: With the torch consumables removed this voltage should be approximately 26VDC.

14.If the relays (RL2 and RL3) are activating with 115VAC applied to the machine and the above test voltages are correct the input board is functioning correctly.

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Figure F.7 Input Board Test Points

F1

	AC
	A B
	RL3
	AC
Fan	RL2
Fan	CP
Leads
	V1

V2	1 2 3 4 5 6 7 8

PLUG CN1

PRO-CUT 25

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Contents PRO-CUT Safety Cylinder may explode if damaged Précautions DE Sûreté SafetyMaster Table of Contents for ALL Sections PRO-CUT Installation Section Table of ContentsTechnical Specifications PRO-CUT 25 K1756-1 InstallationSelect Proper Location Safety Precautions Electric Shock can KillHigh Frequency Interference Protection Input Electrical ConnectionsGAS Input Connections Torch Output ConnectionsPRO-CUT Table of Contents Operation Section Preheat Temperature for Plasma Cutting Safety PrecautionsOperation DescriptionUser Responsibility Operational Features and ControlsDesign Features Advantages Consumable Life Cutting CapabilityLimitations Controls and SettingsPilot ARC Discussion Apparently wrong, reset the machine by turningGeneral In All Cases Procedure RecommendationsPRO-CUT Accessories General Options Accessories Maintenance Electric Shock can kill Routine MaintenancePRO CUT PRO-CUT Table of Contents Theory of Operation Section Input Line VOLTAGE, and Auxiliary Transformer Theory of OperationGeneral Description Figure E.3 Precharge and Protection Precharge and ProtectionReturn Return to Section TOC Main TransformerFigure E.5 Plasma Output Section and Torch Figure E.6 Control Board Control BoardAccidental Operation Protection Safety PARTS-IN-PLACE ProtectionProtection Circuits Insulated Gate Bipolar Transistor Igbt Operation Table of Contents Troubleshooting & Repair Section HOW to USE Troubleshooting Guide Troubleshooting & RepairPC Board Troubleshooting Procedures Output Problems Function Problems See the Operation section Troubleshooting & Repair LED Function Problems Description Input Filter Capacitor Discharge ProcedureRight Side of Machine Discharge ProcedureMain Inverter Board Resistance Test Right Side of Machine IGBT’s D2 D1 D11 D10 PRO-CUT Input Board Voltage Test Test Points Fan PRO-CUT Main Inverter Board Voltage Test P2 P1 P2 P1 PRO-CUT Torch Continuity and Solenoid Test Torch Continuity and Solenoid Test Torch Continuity and Solenoid Test PRO-CUT AIR/GAS Solenoid Test AIR/GAS Solenoid Test Control Board Removal and Replacement Small Red Cap Screws Over tighten Input Board Removal and Replacement Input Board Input Board Removal & Replacement PRO-CUT Main Inverter Board Removal and Replacement Main Board Main Inverter Board Removal & Replacement PRO-CUT Switch Removal and Replacement PRO FAN Removal and Replacement Fan Do Not Over tighten Machine Input and Output Retest After RepairTable of Contents Electrical Diagrams Section Electrical DiagramsInput Voltage Board Pressure SCHEMATIC- Control Printed Circuit Board Sheet Electrical Diagrams Electrical Diagrams PC Board Assembly Main Inverter Board PC Board Assembly Input Board Cutting Current Path SVM Error Reporting Form