Look through the ventilation trusses on the front of the plasma power supply to see the magnetics fans
(254 mm / 10 inches) inside. It is not necessary to remove the external panels to see these fans. The
magnetics fans are near the front and bottom.
6. From the XPR web interface, make sure that the speed for each magnetics fan is in the permitted
range.
During normal operation, it can be difficult to see individual blades because of the fast speed of the fan
rotation. If you can easily see individual blades without the use of a strobe lamp, the rotation speed is
possibly too slow.
Fan type Permitted range of speed
Large fans (254 mm / 10 inches) 2,800 RPM – 3,400 RPM
Small fans (120 mm / 4.7 inches) 5,600 RPM – 6,400 RPM
7. If the speed of the fans is less than the permitted range, remove the electric power from the cutting
system.
8. Remove the front panel from the plasma power supply.
9. If you find obstructions, debris, or dust, use compressed air to remove the obstruction, debris, or dust
from the fans and from the magnetics area.
The magnetics area can collect large amounts of dust or debris. Multiple uses of compressed air is
often necessary to clean this area. Use personal protective equipment for protection from airborne
particulates and debris.
Make sure to keep fan rotation to a minimum during compressed air use. You can use a gloved hand to
hold a fan in position, if necessary.
10. If the magnetics fans have no visible obstruction, dust, or debris:
a. Disconnect the connector from the control PCB (for the magnetics).
b. Use a digital multimeter and the following connector-pin locations to measure the resistance
from each thermistor wire:
Thermistors are on the magnetics.
Diagnos-
tic codes
Thermis-
tor location
Location of thermis-
tor wires/connector
1st con-
nector pin
2nd con-
nector pin
580, 660, 671 Inductor 1A PCB 1 (plasma power supply) J1.4 pin 3 J1.4 pin 4
581, 661, 672 Inductor 1B PCB 1 (plasma power supply) J1.4 pin 5 J1.4 pin 6
582, 662, 673 Inductor 2A PCB 1 (plasma power supply) J1.4 pin 7 J1.4 pin 8
Diagnostics and Troubleshooting
8
339811530Instruction ManualXPR460
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