Hobart GPU-600 Series, Operation And Maintenance Manual

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OM-2244 / Operation and Maintenance Manual
DCS-600/ Series 500082 / Solid State Transformer-Rectifiers
December 15, 2014 Chapter 2-2
Page 1
Section 2 Calibration and Test of PC Control Board
IMPORTANT
Before attempting to make tests and adjustments on the GPU, READ THIS ENTIRE
SECTION to become familiar with the proper procedures.
1) General
This section describes the test points, test values, and adjustment locations for testing and adjusting the
printed circuit board that controls the GPU. The control board is mounted on a hinged panel. To access
the board for measurements and adjustments, open the panel so that the board is accessible from the
front of the GPU and you do not have to work next to hazardous voltages.
Use the Test Procedure (Part 3 of this section) to determine if the circuit board is operating properly. ITW
GSE recommends calibration of the PC board at the factory, but the calibration procedure is included in
this section (Part 4) in case field calibration is necessary. Faulty control boards should be returned to the
manufacturer for repair.
WARNING
Electric shock and arcs can kill or injure! Use caution to inspect or test the printed
circuit control board while the equipment is running. The voltages on the printed
circuit board are safe; however, removing the top panel exposes people to
dangerous voltages. When working with the circuit board, rotate the panel out to
move the board away from internal parts.
2) Circuit Board Components
This section is provided to help you locate test points and controls on the circuit board and understand
their functions. Figures 2 and 3 show the locations of test points and adjustment potentiometers for
possible field adjustment. Table 1 shows the functions of the test points and adjustments.