Hypertherm MAX200 Service Manual - Manual (Page 71)

3-30 MAX200 Service Manual
6-94
MAINTENANCE
WARNING
SHOCK HAZARD: Always use caution when servicing a power supply when the covers are removed.
Dangerous voltages exist within the power supply which could cause injury or death. If questions or
problems arise during servicing, call the Hypertherm Technical Services Department at 1-800-643-0030.
Test Procedures
Arc Transfer Test Procedure
The “transfer” of arc refers to the arc being made between the electrode of the torch and the workpiece. The pilot
arc is made between the torch electrode and the torch nozzle and precedes transfer in normal operation. When
transfer is made, it is sensed by a Hall effect device (CS1) and the signal is sent to the Control Board PCB7. To
check for proper functioning of the arc transfer sensing system, perform the following procedure:
1. Observe D8 on PCB7 (see Figure 3-16) and see if it lights after main contactor closes (see sequence flowchart
earlier in this section). If it does not light, continue to next step. If it does light, return to Troubleshooting section.
2. Disconnect PL12 from CS1 (see Figure 4-12 for location of CS1) and check for +12VDC between pins 1&2. If
there is +12VDC, go to step 5.
3. If there is no +12VDC, power down and check connectors, pins and associated wiring between PL12 and REC2
of PCB7.
Repair and/or replace defective component(s) if necessary.
4. If wiring is O.K., replace PCB7.
5. If there is +12VDC between pins 1&2 of PL12, reconnect PL12 to CS1 and take voltage between pins 13&14 of
REC2 on PCB7 after arc is established. This should read 0 volts.
If there is no 0 volts, replace CS1.