Test Procedure - Hobart 6T28-600CL Operation And Maintenance Manual

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

3) Test Procedure

Follow the table steps in this section to verify that the PC board is functioning properly. If the voltage
readings to the PC board common are not within specification, attempt to correct the reading by adjusting
the applicable control. Be certain the operating conditions are exactly as stated in the table.
If the board does not adjust, check the leads, fuses (F2-F7), and connectors. If no external problems are
found, the PC control board is faulty. Replace it with a known good board.
After replacing the board, recheck the voltages. In some cases, minor adjustments may be required for
optimum calibration. If the replacement board shows the same magnitude of error and lack of adjustment
control, it is possible that the control board is not at fault. The voltages in the following table are all
referenced to pc board common, which is Test Point 3 (TP3) and Test Point 15 (TP15). Connect the
negative voltmeter lead to either of those test points.
TEST TEST
STEP POINT CONDITION
1
TP5 Open circuit: no load
2 TP6 Open circuit: no load
Open circuit:
3 TP7
TP4
4 Open circuit: no load
TPD Open circuit: no load
5 TPE Open circuit: no load
TPF Open circuit: no load
TP1
With a 100 A load,
adjust R9 and R10
carefully for lowest
6 TP2
ripple voltage
(typically 100 to 160
TP8
December 15, 2014
TEST
MEASUREMENT
+ 15 VDC ± 5%
+ 24 VDC ± 10%
no load
+ 10 VDC ± 10%
+ 3.3 VDC + /-10%
+ 3.3 VDC ± 10%
+ 3.3 VDC ± 10%
-8.2 VDC ± 10%
(measured with no load)
-8.2 VDC ± 10%
(measured with no load)
mV).
-8.2 VDC ± 10%
(measured with no load)
VOLTAGE
- 15 VDC ± 5%
TEST
DESCRIPTION
Checks (+) voltage regulator output set
by U4.
Checks (-) voltage regulator output set
by U5.
Checks unregulated control voltage
needed for 1 and 2
Checks gate pulse timer volts supply
set by CR9
Checks gate pulse timer operation
before phase balancing and
amplification
Checks gate pulse timer operation
before phase balancing and
amplification
Checks gate pulse timer operation
before phase balancing and
amplification
Checks gate pulse timer operation and
balance adjustment
Checks gate pulse timer operation and
balance adjustment
Checks gate pulse timer operation and
balance adjustment.
Chapter 2-2
Page 5