Hypertherm HT4001 Plasma Arc Cutting System - Manual (Page 95)

OPERATION
5-4
HT4001
Instruction Manual
Controls and Indicators (cont.)
Gas Console (Fig. 5-3)
• PLASMA N
2
/O
2
Toggle Switch (S1)
Selects the use of either nitrogen or oxygen as the plasma cutting gas.
• Test Preflow / Run / Test Cut Flow Toggle Switch (S2)
Test Preflow – Used when setting the plasma gas preflow flow rates on the flow meters as specified in the
Cut Charts. In this position the contactor is disabled.
• N
2
(FM1) and O
2
(FM2) flow meters - In test preflow, indicate the percentage of plasma gas flow, nitrogen
or oxygen/nitrogen mix, required for pre-cut conditions.
• N
2
Preflow (MV2) and O
2
Preflow (MV3) metering valves - Adjusts plasma gas preflow.
Test Cut Flow – Used when setting the plasma gas cut flow rate on the N
2
or O
2
flow meter for cutting
conditions as specified in the Cut Charts. In this position the contactor is disabled.
• N
2
(FM1) or O
2
(FM2) flow meter – In test cut flow, indicates the percentage of plasma gas flow, oxygen or
nitrogen, required for cutting conditions.
• PLASMA Cut Flow motor valve (MV1) (Activated by momentary switch) – Adjusts plasma gas test cut
flow.
Run – Enables the contactor and the subsequent firing of the arc after the gas flow rates have been set in
the Test Preflow and Test Cut Flow positions and the H
2
O Injection (torch water injection) as described
below has been set.
• H
2
O Injection flow meter (FM3) – Indicates the percentage of injection water flow as indicated in the Cut
Charts.
• H
2
O Injection metering valve (MV4) – Adjusts injection water flow as indicated in the Cut Charts.