Hypertherm XPR170 - Page 279

Diagnostics and Troubleshooting
8
XPR170 Instruction Manual 810060 279
622
Failure
Under voltage-DC
bus
The DC bus voltage is less
than 280 V.
1. Confirm the input-line voltage is within+/-14%
of nominal. Refer to Input power requirements
on page 42.
2. Remove the power from the cutting system.
3. Remove the cover from the contactor.
4. Inspect the contacts for excess wear. Replace
the contactor, if excess wear is found.
5. Inspect the following contactor components for
loose connections:
• Contactor
•Input to chopper
• Power cord
6. Tighten loose connections if found.
7. Examine the connections from the control PCB
on J6. Look for loose or bad connections on
pins 5 and 6. Tighten loose connections or
replace bad connections.
8. Make sure that LED D1 on the power
distribution board (141425) is illuminated.
9. If not illuminated, examine the power
distribution board. Look for:
• 120 VAC at the input (J1 pins 5 – 6)
• Continuity on fuse FH2 (with power OFF)
• 120 VAC at the output (J5 pins 7 – 8 and pins
9– 10)
10. If 120 VAC is not present on the J5 contactor
output pins, inspect J4 and K1 relay
connections for damage.
11 . If K1 is bad, replace either the power
distribution board (141425) or the K1 relay
(003257).
12. If the code continues, contact your cutting
machine supplier or regional Hypertherm
Technical Service team.
Shut down Remote on-off
Diagnostic code
number and
category
Diagnostic code
name
Description Corrective action XPR action
Code cancels
with