Hypertherm HT4400 HySpeed Plasma Arc Cutting System - Manual (Page 92)

HT4400 Instruction Manual 5-1
7
Section 5
MAINTENANCE
In this section:
Introduction .............................................................................................................................................................5-2
Routine Maintenance..............................................................................................................................................5-2
Replacing the Cooler Filter .....................................................................................................................................5-3
Pump Strainer Cleaning..........................................................................................................................................5-3
Torch Coolant Draining ...........................................................................................................................................5-4
Cooler Draining.......................................................................................................................................................5-4
HT4400 Startup Sequence .....................................................................................................................................5-5
HT4400 Plasma START Sequence ........................................................................................................................5-6
HT4400 Plasma RUN Sequence ............................................................................................................................5-7
Error Code Troubleshooting - 1 of 3 .......................................................................................................................5-8
Error Code Troubleshooting - 2 of 3 .......................................................................................................................5-9
Error Code Troubleshooting - 3 of 3 .....................................................................................................................5-10
System Troubleshooting - 1 of 4 ...........................................................................................................................5-11
System Troubleshooting - 2 of 4 ...........................................................................................................................5-12
System Troubleshooting - 3 of 4 ...........................................................................................................................5-13
System Troubleshooting - 4 of 4 ...........................................................................................................................5-14
Initial Checks ........................................................................................................................................................5-15
Power Measurement Location - All Voltages ........................................................................................................5-16
Power Distribution PCB1 - Status Indicators ........................................................................................................5-17
Microprocessor Control Board PCB2 - Status Indicators......................................................................................5-18
Analog Board PCB3 - Status Indicators................................................................................................................5-19
Current Sense Test ...............................................................................................................................................5-20
Relay Board PCB4 - Status Indicators..................................................................................................................5-21
Serial I/O Board PCB5 - Status Indicators............................................................................................................5-24
Start Circuit Board PCB14 - Status Indicators and Operation ..............................................................................5-29
Pilot Arc Current Levels ...............................................................................................................................5-29
Start Circuit Functional Schematic ...............................................................................................................5-30
Start Circuit Troubleshooting........................................................................................................................5-30
Phase Loss Detection Board PCB21- Status Indicators and Operation ...............................................................5-31
Chopper Module Test Procedure .........................................................................................................................5-32
Coolant Flow Test .................................................................................................................................................5-34
Pressure Switch Settings......................................................................................................................................5-36
Gas Console Valve Select Switch Detail ..............................................................................................................5-37
Preventative Maintenance Schedule ....................................................................................................................5-38