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 1-2
Page 5
(1) Make sure electrical service is off.
(2) Connect the input power cables to the input power source.
(3) Connect the grounding conductor to a proper ground.
(4) Leave the electrical service turned off.
e) Connect the Output Cable
Wheel-mounted GPUs are generally shipped with the output cable already installed. For bridge-
mount or stationary GPUs, the customer must supply and connect the output cable. To connect the
output cable, follow these steps:
(1) Route the cable through the side panel and under the cable clamp.
(2) Connect the positive output lead to the positive output terminal of Output Contactor K2.
(3) Connect the negative output lead to Ammeter Shunt R11.
(4) Tighten the cable clamp.
Figure 4 Output Connections
f) Check GPU No-Load Operation
A no-load check should be made before the GPU is connected to an aircraft. Proceed as follows.
(1) Replace the top panel.
(2) Apply input power to the GPU from the input power source.
(3) On the front panel of the GPU, turn on the input power switch.
(4) Verify that the amber input power light turns on.
(5)
Hold the output contactor switch up in the “Close” position until the green output contactor light
turns on.
(6)
Release the output contactor switch to the middle “On” position.
(7) Verify that the voltmeter shows the proper voltage.