Hypertherm HT4001 Plasma Arc Cutting System - Manual (Page 141)

MAINTENANCE
11-96
HT4001
Instruction Manual 6-15
3. The fans are running, but the
POWER AC indicator is not
illuminated.
3.1. Light bulb LT1 is blown.
Replace LT1. See page 7-5 for part number information.
4. The POWER AC indicator is
illuminated, the fans are
running, but one or more of
the STATUS indicators is
also illuminated.
4.1. There is an interlock fault condition.
To troubleshoot STATUS fault conditions, see Status LED
Troubleshooting later in this section.
Problem Possible Causes and Solutions
5. No gas flow. 5.1. Gas supply is turned off.
Turn supply gas ON.
5.2. Leak in gas hose.
Check for and repair/replace leaking hose.
5.3. Metering valves MV2 (N
2
) or MV3 (O
2
) closed.
Open valves. See page 5-5 for location of MV2 and MV3.
5.4. One or more solenoid valves not functioning or not getting signal
to open or close from relay board.
See Sequence of Operation flowchart to determine which valves
are on or off. Use system wiring diagrams and relay board status
indicators in Test Preflow mode later in this section to
troubleshoot.
6. Cannot adjust gas to proper
level.
6.1. Hosing from supply is pinched.
Check and repair any kinks in hosing line.
6.2. Leak in gas hose.
Check for and repair/replace leaking hose.
6.3. Supply hose inner diameter is too small.
Use larger diameter hose.
Select Test Preflow
(with S2 on Gas Console)