Operation Procedure; Voltmeter; Output Current Limit - Hobart 6T28-600CL Operation And Maintenance Manual

OM-2244 / Operation and Maintenance Manual
DCS-600/ Series 500082 / Solid State Transformer-Rectifiers

3) Operation Procedure

a) Input Control Functions
(1) Turn on S1 input contactor switch (1-1, 10, Figure 4).
(2) Verify that only the amber input power light (1-1, 12, Figure 4) glows. If the light glows, no
problems exist requiring service.
b) Output Control Functions
(1) Hold the S2 output contactor switch (1-1, 11, Figure 4) in the up "CLOSE" position long enough
for the green output contactor light (1-1, 13, Figure 4) to glow.
(2) Release S2 switch to the middle "ON" position.
(3) Verify that M1 DC ammeter (1-1, 2, Figure 4) does not read excessive amperage.
(4) The DC power supply should continue to deliver power until the S2 switch is placed in the down
"OFF" position or one of the other control functions turn the unit "OFF".

4) Voltmeter

a) Verify on the M2 DC voltmeter (1-1, 3, Figure 4) that the DC output voltage level is correct. If not, turn
off power supply, disconnect your load, and refer to Service, Chapter 2 for instructions.

5) Output Current Limit

a) If the DC ammeter continuously reads more than 600 A DC after start-up, immediately turn R13
current limit control (1-1, 8, Figure 4) down to continuous operation current point, normally 600 A DC.
This may prevent input fuse blowing and automatic overload trip out.
b) If R13 has no effect or if the output current cannot be decreased to about 200 A DC at the R13
minimum position, a faulty SCR device or control circuit malfunction is indicated requiring power
supply repair. Refer to Chapter 2 for service instructions.
December 15, 2014 Chapter 1-3
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