Hypertherm HD3070 Plasma Arc Cutting System w/ Automatic Gas Console User Manual

Page 198

Advertising
background image

HD3070 with Automatic Gas Console

Instruction Manual

5-73

16

MAINTENANCE

8. If chopper still does not output 280V after completing step 7, there may be a problem with the control signal or

the chopper module. The chopper drive signal comes from control board 1XPCB3 as an analog level from 0 to
+8 VDC, which varies the duty cycle and subsequent output current of the chopper. These analog signals are on
pins 5 & 6 of REC3 on control board 1XPCB3. See Figure 6-2 for location of 1XPCB3.

To determine if there is a problem with the chopper module or control board 1XPCB3, proceed as follows:

• Ensure that high frequency is still disabled (see step 1).

• Place voltmeter across output terminals of chopper (positive lead to (+) WORK and negative lead to

(-) TORCH and press the START command.

• If the voltmeter reads +280 VDC, then replace control board 1XPCB3.

• If the voltmeter reads 0 volts, then replace chopper module.

Advertising