Hypertherm Powermax30 XP Service Manual - Manual (Page 139)

Powermax30 XP Service Manual 808150 Revision 1 139
6 – Power Supply Component Replacement
Replacing the pressure switch
1. Complete the following procedures:
a. Set the power switch to OFF (O), disconnect the power cord from the power source, and disconnect the gas
supply.
b. See Remove the power supply cover on page 88.
2. Disconnect the ground wire that is attached to the clip on the air filter/regulator’s brass “T” fitting.
3. Disconnect the red and black wires from the pins on the pressure switch.
4. Use a 1-1/16 inch wrench or large adjustable wrench to remove the pressure switch from the brass elbow fitting on
the air filter/regulator assembly. (See Figure 74 on page 140.)
5. Apply a small drop of thread sealant to the middle threads of the new pressure switch. Do not apply thread sealant to
the threads at the end of the pressure switch that will be inserted into the air filter/regulator assembly.
 If applied too heavily, excess amounts of thread sealant can contaminate the gas line.
6. Tighten the new pressure switch into the brass elbow fitting. Turn the pressure switch until its pins are horizontally
aligned. Verify the pressure switch is angled up at approximately 45°. (See Figure 74 on page 140.)
7. Press the black wire’s connector onto the pressure switch pin that is nearest the center panel.
8. Press the red wire’s connector onto the pressure switch pin that is farthest from the center panel.
9. Reconnect the ground wire to the clip on the brass “T” fitting with a torque setting of 11.5 kg-cm (10 inch-pounds).
10. Complete the following procedures:
a. See Install the power supply cover on page 89.
b. Reconnect the gas supply and power cord, and set the power switch to ON (I).
Kit number Description
228688 Kit: Pressure switch
CAUTION!
Never use PTFE tape on any joint preparation. Use only a liquid or paste thread sealant on male
threads.