Hypertherm Powermax 125 Service Manual

Powermax125 Service Manual 808070 209
9 – Power Supply Component Replacement
Replacing the input diode bridge
1. Complete the following procedures:
a. See Disconnect the power and gas supply on page 166.
b. See Remove the power supply cover on page 172.
c. See Remove the component barrier on page 173.
d. See Remove the DSP board on page 203.
e. See Remove the power board on page 205.
2. Remove the 2 mounting screws from the input diode bridge brackets, and remove the input diode bridge from the
heatsink. See Figure 76 on page 215.
3. Clean the area where the input diode bridge was mounted using isopropyl alcohol to remove the old thermal grease
from the heatsink.
4. Apply a 0.0762 mm (0.003 inch) layer of thermal grease, about the thickness of a sheet of paper, evenly to the input
diode bridge mounting surface.
5. Mount the input diode bridge to the heatsink by hand-tightening the 2 supplied mounting screws.
6. Step-torque the 2 mounting screws to the proper torque value as shown in Figure 76 on page 215.
7. Complete the following procedures:
a. See Install the power board on page 206.
b. See Install the DSP board on page 203.
c. See Install the component barrier on page 173.
d. See Install the power supply cover on page 172.
e. Reconnect the power and gas supply.
Kit number Description
128746 Kit: Powermax105/125 input diode bridge

Hypertherm Powermax 125 Specifications

General

Output Current	30-125 A
Input Power	15.2 kW
Open Circuit Voltage	300 VDC
Gas Supply	Clean, dry, oil-free air or nitrogen
Input Power Cable Length	10 ft (3 m)
Rated Output Current	125 A
Gas Type	Air or nitrogen
Cutting Capacity	1-1/4 inch (32 mm)
Pierce Capacity	1 inch (25 mm)
Input Voltage	200-600 V, 3-PH
Duty Cycle	100% @ 125 A
Certifications	CSA
Maximum Clean Cut Thickness	1-1/4 inch (32 mm)
Cooling Method	Fan-cooled
Torch Options	Hand