Hobart 6T28-600CL Operation And Maintenance Manual page 21

OM-2244 / Operation and Maintenance Manual
DCS-600 / Series 500082 / Solid State Transformer-Rectifiers
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1. TP1 SCR Gate Pulse from R10 Adjustment
2. TP2 SCR Gate Pulse from R9 Adjustment
3. R9 Balance Adjustment Phase 2 (TP2)
4. R10 Balance Adjustment Phase 3 (TP1)
5. TP8 Balance SCR Gate Pulse Phase1
6. R38 No Load Amp Off Set Null (TP14)*
7. R37 Over-voltage Trip Point
8. TP3 PC Board Common
9. TP4 +9.1 VDC Timer Voltage
10. TP5 +15 V Regulated Voltage
11 TP6 –15 V Regulated Voltage
12. TP7 +24 V Non regulated Voltage
13. TP14 Null at 0 A DC TP (R38)*
* Note TP14 provides amplified load amp reading for comparison with overload limit (TP20) and starting
amperage limit (TP21) set by R13 control on front panel.
Figure 6 Solid State Printed Circuit Control Board Test Points of GPU-600
December 15, 2014
23 24 7
13 19
8 9 10
18 17 16
14. R60 Overload Limit (TP20)
15. R109 28 V DC Output Calibration (TP13)
16. R101 5 V Reference Volt Adjustment (TP19)
17. R102 Voltage Slope Adjustment (TP17)
18. TP19 Reference Volt Test Point (R101)
19. TP17 Voltage Slope Test Point (R102)
20. TP15 Common, PC Board Volts
21. TPF SCR Gate Pulse Timer
22. TPE Gate Timer Output Phase 2
23. TPD Gate Timer Output Phase 3
24. TP13 Actual Output Volt (28.5 or 14.25)
25. TP20 Overload Limit (R60) Adjustment
26. TPL Overload Trip Summing Point
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Chapter 1-1
Page 9