Hypertherm XPR170, Instruction Manual

Page: 265 / 438

Diagnostics and Troubleshooting
8
XPR300 Instruction Manual 809480 265
Measure the line voltage between the terminals inside the plasma power supply
It is necessary for the cutting system to have electric power to measure line voltage. Use extreme
caution if you do diagnosis or maintenance tasks when the plasma power supply remains plugged in
and the panels on the plasma power supply are removed.
1. Measure the line voltage between the terminals ( Figure 64 on page 266) in the following order:

U to V

U to W

V to W

Verify each line to ground.
2. Determine if the voltage between any 2 of the 3 lines is equal to the supply voltage.
3. If any 1 line is equal to or 10% greater than the other 2 lines, examine with the incoming electric
supply lines.

If the incoming electric supply lines are good, contact a licensed
electrician or the electric company that supplies electricity for more
information.
WARNING
ELECTRIC SHOCK CAN KILL
The plasma power supply contains dangerous electric voltages that can seriously injure or
kill you.
Even if the plasma power supply is turned OFF, you can still get a serious electric shock if
the plasma power supply remains connected to an electric power source.
Use extreme caution if you do diagnosis or maintenance tasks when the plasma power
supply remains connected to an electric power source and the outer cover or panels are
removed.
WARNING
ELECTRIC SHOCK CAN KILL
Voltages at the terminal block and contactors can cause injury or death.
When the line-disconnect switch is in the ON position, there is line voltage at the
contactor and the power distribution PCB.
Use extreme caution when you measure the primary power in these areas.