Hypertherm HT4001 Plasma Arc Cutting System - Manual (Page 135)

MAINTENANCE
8-97
HT4001
Instruction Manual 6-9
HT4001 Sequence of Operation (cont.)
To
Page
6-10
From
Page
6-8
Set current and voltage
Activate Plasma START
IHS probes descend,
detect plate surface,
and retract
CON1 and CON2 in HT4001 power supply (Contactors) close;
CR1 in HT4001 power supply (Pilot Arc relay) close;
LT2 (DC Power) light ON;
SV2 (N
2
Preflow), SV3 (O
2
Preflow) ON (open);
SV5 (Plasma Off), SV6 (Water Injection) ON (open);
Gas and water flow.
IHS Installed?
Water Muffler
Installed?
No
No
Yes
Water Muffler pump
activated.
CH1, CH2, CH3, CH4
(Choppers) activated in HT4001.
HF coil fires, pilot arc activated.
Yes
2 seconds of
gas
Preflow