Maintenance and Troubleshooting SR-45i User’s Manual
output busbar (wire #9). Leave the positive voltmeter lead connected to the
positive side of C7.
13.
Turn on the power supply and give the system a start command. When the
red D.C. Power light illuminates, the voltmeter should read +230 VDC. If
the voltage is correct, the chopper is working properly. Check for open
wires between the chopper output and the Torch Minus connection on the
I/O p.c. board (skip the rest of this test).
14.
Remove the start signal and measure the voltage between P1-9 and P1-10 on
the chopper pc board. It should read 120 VAC. If the voltage is not correct,
make the measurement with P1 disconnected from the chopper. If the
voltage is correct with the chopper disconnected, replace the chopper. If the
voltage is still not correct, check the primary and secondary voltages of the
control transformer TR3, the auxiliary contacts of CON1, and fuse F3.
15.
a. If the voltage between P1-9 and P1-10 were correct in step 14, move the
negative lead of the voltmeter to P1-5. Connect the positive lead of the
voltmeter to P1-4. Apply primary power to the unit (a start signal is not
required). The voltage on P1-4 should measure approximately 5.8 VDC.
If P1-4 measures 5.8 VDC, go to step d.
b. If the voltage between P1-4 and P1-5 did not measure 5.8 VDC in step a,
unplug P2 from the logic-regulator p.c. board. If P1-4 still does not
measure 5.8 VDC, go to step c. If P1-4 now measures 5.8 VDC, measure
the voltage between TP2 and TP6 on the logic-regulator p.c. board. If
TP6 measures 10.5 VDC, replace the logic-regulator p.c. board (skip the
rest of this test). If TP6 measures 0 VDC, check the continuity from the
current feedback shunt SH1, through RP2, and back to P4 on the logic-
regulator p.c. board. If both of the lines are good, replace the logic-
regulator p.c. board (skip the rest of this test).
c. If P1-4 did not measure 5.8 VDC in step b, unplug the chopper connector
P1 and measure the continuity between the two wires connected to pins 4
and 5 (leave P2 unplugged from the logic-regulator p.c. board). If the
two wires are not shorted together, replace the chopper (skip the rest of
this test).
d. Unplug P4 from the logic-regulator p.c. board. The voltage on P1-4
should drop to approximately .8 VDC. If it does not, measure the voltage
between TP2 and TP6 on the logic-regulator p.c. board. If TP6 measures
0 VDC, check the continuity in the lines between the logic-regulator p.c.
board and the chopper. If the lines are good, replace the logic-regulator
p.c. board.
16.
a. Move the positive lead of the voltmeter to P1-2. Leave the negative lead
connected to P1-5. Apply primary power to the unit (a start signal is not
required). P1-2 should measure 4.25 VDC. If P1-2 measures 4.25 VDC,
go to step c.
b. If P1-2 did not measure 4.25 VDC in step a above, unplug P2 from the
logic-regulator p.c. board. If P1-2 now reads 4.25 VDC, replace the
logic-regulator p.c. board. If P1-2 still does not read 4.25 VDC, check
the continuity in the lines between the logic-regulator p.c. board and the
5-12
Содержание SR-45i
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