Hypertherm Powermax45 Service Manual - Manual (Page 104)

TroubleshooTing and sysTem TesTs
5-28
powermax
45 Service Manual
Test 9 – pressure transducer
Test the pressure transducer to ensure that the system is receiving the proper gas pressure.
1. Turn ON the power.
2. Check the voltage between pins 1 and 2 of J5 for 200–240 V CSA and 230 V CE power supplies or pins 1 and 2
of J6 for 400 V CE and 480 V CSA power supplies. It should read approximately 0.2 V if there is no gas pressure.
If the gas pressure is within system tolerances, the circuit should read approximately 3.3 V.
The minimum acceptable gas pressure varies by torch type, torch lead length, and mode switch setting as shown
in the following table.
Normal Continuous pilot arc gouging
Handheld, 6.1 m (20 feet) 3.45 bar (50 psi) 3.45 bar (50 psi) 1.72 bar (25 psi)
Handheld, 15.24 m (50 feet) 3.80 bar (55 psi) 3.80 bar (55 psi) 2.07 bar (30 psi)
Mechanized, 7.62 m (25 feet) 3.45 bar (50 psi) 3.45 bar (50 psi) 1.72 bar (25 psi)
Mechanized, 10.7 m (35 feet) 3.45 bar (55 psi) 3.45 bar (50 psi) 1.72 bar (25 psi)
Mechanized, 15.25 m (50 feet) 3.80 bar (55 psi) 3.80 bar (55 psi) 2.07 bar (30 psi)
Test 10 – power switch trip coil
The 200 –240 V CSA and the 230 V CE power supplies have over-voltage protection on the power switch in the form
of a mechanical trip coil. If voltage provided by the incoming circuit is greater than the maximum voltage, the trip coil will
switch OFF the power supply.
If the power supply appears to be shutting down unexpectedly, test the power switch:
1. With the power switch in the OFF position, disconnect the electrical power.
2. Move the power switch to the ON position. If the switch stays in position, the trip coil mechanism is functioning
properly. If it does not stay in the ON position, replace the power switch.