Hobart 6T28-600CL Operation And Maintenance Manual page 18

OM-2244 / Operation and Maintenance Manual
DCS-600 / Series 500082 / Solid State Transformer-Rectifiers
(6) Overload/Overvoltage Light (Figure 4 Item 6)
The overload/overvoltage trip light turns on whenever one of the following system faults occur:

The output voltage has exceeded 31.5 V DC.

The output current has exceeded 2125 to 2200 A DC.
This light is an LED assembly.
(7) DC Ammeter (Figure 4 Item 7)
The DC ammeter has a 0 to 2000-amp scale. It actually measures the mill volt drop across the
R11 ammeter shunt that corresponds to the scale calibration. The scale range is so much more
than the rated output because the unit is capable of providing much more current for short
durations (engine starts).
(8) Input Power Light (Figure 4 Item 8) (amber)
This light is connected across the coil of the contactor, so it turns on when that contactor has
been energized.
(9) Output Contactor Light (Figure 4 Item 9) (green)
This light is connected across the coil of the output contactor, so it turns on when that contactor
has been energized.
(10) Input Power On-Off Switch (Figure 4 Item 10)
This switch turns the input contactor on and off. The control transformer T2 supplied power to the
input contactor coil through this switch and fuse F8. The input contactor connects the input power
to the power transformer primary windings through the voltage changeover board.
(11) Output Contactor Close-On-Off Switch (Figure 4 Item 11)
The S2 output contactor close-on-off switch has a spring loaded up position for the "close" mode,
a middle position for "on" mode, and a bottom position for the "off" mode. The output contactor
connects the DC output power to the output cable. To turn the output contactor on, move the
output contactor switch to the "close" position and then release it to the center "on" position. To
turn the output contactor off, move the output contactor switch to the "off" position.
(12) Emergency Stop Switch (CE certified units only – not shown)
This switch is located in the lower right corner. Press to shut off the GPU.
December 15, 2014 Chapter 1-1
Page 6