Hypertherm HSD130 HySpeed Plasma - Manual (Page 150)

MAINTENANCE
5-4 HySpeed HSD130 RHF Instruction Manual
Sequence of operation
1. Power-up – The system verifies that all of these signals are off at power-up
Coolant flow off
Chopper current off
Transfer off
Phase Loss off
Chopper 1 over-temp off
Magnetics over-temp off
Coolant over-temp off
Plasma start off
2. Purge – Air or O
2
gas flows through torch for 24 seconds
Coolant flow on
Contactor closes and the chopper performs a chopper test and a current sensor test
Plasma start off
Contactor opens when the purge cycle ends
Gas pressure OK
3. Idle
Gas pressure OK
Coolant flow on
Chopper current off
Line voltage OK
4. Preflow – Gas flows for 1.25 seconds
5. Pilot arc – Current flows between electrode and nozzle
Chopper, main contactor, and pilot arc relay are on
High frequency present
Chopper current sensor = pilot arc current
6. Transfer – Pilot arc current sensed on the worklead
7. Ramp-up – Chopper current increases to set-point and the gas switches to cutflow
Coolant flow on
Gas pressure OK
Phase loss on
Line voltage OK
8. Steady state – normal operating parameters
Coolant flow on
Gas pressure OK
Phase loss on
Chopper over-temp off
Magnetics over-temp off
Coolant over-temp off
9. Ramp-down – Current and gas flow decrease after plasma start has been removed
Cutflow gas off
10. Auto Off – 10-second postflow
Main contactor off
Chopper off