Hypertherm HT2000-200 Volt - Manual (Page 156)

MAINTENANCE
HySpeed HT2000
Instruction Manual
8-11
24
3. The green POWER ON pushbutton
switch PB1 is pressed, the fans are
operating, but the green POWER
ON indicator does not illuminate.
3.1. Pushbutton PB1 was not held down for a long enough
period of time.
Press and hold PB1 for a minimum of 5 seconds.
3.2. Relay CR1 on the power distribution board is defective.
Check that CR1 switches when POWER ON pushbutton is
pressed. See Figure 8-2 for location of CR1. If CR1 is
defective, replace PCB1.
3.3. One or more of the STATUS LEDs remains illuminated,
indicating a fault condition.
To troubleshoot STATUS fault conditions, see
Status LED
Troubleshooting
later in this section.
4. The green POWER ON indicator is
illuminated, the START command is
given and DC ON indicator is
illuminated, but there is no high
frequency and no pilot arc.
4.1. There is no spark between the spark gap electrodes.
Clean (with emery cloth), align and reset the electrode gaps
to .020" (0.51 mm), if necessary. The electrode surfaces
between the gaps should be flat. If surfaces are rounded,
replace and reset the gap. See Figure 9-12 for part number
information.
• Inspect the high voltage transformer T1 in the RHF
console for overheating. See Figure 9-11 for location of
T1. Replace T1 if overheating.
• Check for 120VAC at T1 after START command is given.
Note that door interlock switches S1 and S2 have to be
closed in order to pass the START sequence.
Switches will close in both IN position, and if pulled OUT.
• If there is no 120VAC at T1, use wiring diagrams in
Section 10
and check pins, connectors and associated
wiring from T1 to relay board PCB4. If connections are
OK, there may be a problem with either PCB4 or PCB2.
See sheet 4 of 13 in
Section 10
for location of the relay
that controls RHF transformer T1.
Problem Possible Causes
/ Solutions