Hypertherm Powermax125 Service Manua - Manual (Page 150)

150 Powermax125 Service Manual 808070
8 – Troubleshooting and System Tests
Test 1 – Voltage input
Symptom: Voltage fault (0-60-0, -1 or -2)
 Check the line voltage at the top of the power switch (S1) with the switch in the OFF (O) position.
 Check the input voltage to the input diode bridge with the switch in the ON (I) position.
 The AC voltage between any 2 input wires should equal the line voltage.
 If there is proper voltage to the power switch and low voltage to the input diode bridge, replace the power switch.
 Check the output voltage of the input diode bridge.
 Output VDC = Line Voltage x 1.414 VDC.
 All values are ±15%.
Figure 20
 Wire colors may vary in power cords not purchased from Hypertherm.
3-phase
L1 Black (CSA)
Brown (CE)
L2 White (CSA)
Black (CE)
L3 Red (CSA)
Gray (CE)
PE Green (CSA)
Green/Yellow (CE)
LV
LV LV
3 inputs to GRD LV/1.732LV
LV x 1.414 Black wire
Ground
(GRD)
LV – incoming line voltage