Maintenance – Hypertherm HT4001 Plasma Arc Cutting System User Manual

Page 147

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MAINTENANCE

4-99

HT4001

Instruction Manual

6-21

3. COOLING WATER illuminated:

3.1. Coolant flow too slow.

This LED will extinguish when flowswitch FS1 in the RHF console
closes after sensing a coolant flow of at least 1.25 gpm (4.7 l/m).

• Verify that the water chiller is plugged in and is ON.

• Verify that the water supply is connected to the water chiller

and is ON.

• Verify that there are no leaks from the water chiller to the RHF

console to the torch.

3.2. Flow switch FS1 in RHF console not functioning.

• Check cable, and wiring from REC3 of PCB1 to pins 7&8 of

RHF console cable connector for continuity.

• If wiring is OK and inlet coolant flow is OK, FS1 may need to be

replaced.

Repair and/or replace defective component(s), if necessary.

Problem

Possible Causes and Solutions

4. PLASMA GAS illuminated:

4.1. Plasma gas pressure too low.

This LED will extinguish when PS1 and PS2 (in O

2

mode) or PS1

(in N

2

mode) close after sensing plasma gas pressure of at least

80 psi (5.5 bar).

• Verify that incoming plasma gas pressure is 120 psi (8.2 bar)

for O

2

and 150 psi (10.3 bar) for N

2

.

• Check for gas leaks or loose gas connections if pressure is

inadequate.

4.2. PS1 and/or PS2 in gas console not functioning.

• Check wiring, cables and connectors from REC3 of PCB1 to

pins 14&15 of gas console cable receptacle.

If wiring is OK, and inlet gas pressure is OK, PS1 and/or PS2
may need to be replaced.

Repair and/or replace defective component(s), if necessary.

-

RHF D O O R

-

TRANSFORMER

-

COOLING WATER

-

PLASMA GAS

STATUS

-

RHF D O O R

-

TRANSFORMER

-

COOLING WATER

-

PLASMA GAS

STATUS

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