CEBORA S.p.A.
19
3.3.7
- In open circuit operation, the output voltage is not regular.
WARNING
FOR THESE TESTS
DISCONNECT THE CONNECTOR J4
ON HF BOARD (42) TO
PREVENT HIGH FREQUENCY GENERATION.
OPEN CIRCUIT VOLTAGE OUTPUT TEST.
Output terminal – (AB)(-) and output te (AC)(+) of the power source = voltages
according to the table.
Process Voltage
Condition
TIG - DC
+53 Vdc, fig. 5.2.1a
Start button pressed
TIG - AC
-28 Vdc, fig. 5.2.1b
Start button pressed
Correct?
NO
Correct?
Correct?
YES
♦
Regular operation.
CURRENT TRANSDUCER (5) POWER SUPPLY TEST.
Control board (40), terminals 3(+) and 2(-) = +15 Vdc; terminals 1(+) and 2(-) = -15 Vdc,
approximately.
YES
NO
♦
Check the wiring between current transducer (5) and J4 control board (40).
♦
With power source off, temporarily disconnect the connector J4 from control
board (40) and check the resistance between terminals 3 and 2 and terminals 1 and
2 of the patch connector disconnected from J4. Correct values = approximately 30
- 40 Kohm. If incorrect, replace current transducer (5).
♦
With AC/DC selector switch (30) in the “0” position, power the power source
with J4 on control board (40) disconnected and check the voltage on J4 of control
board (40), terminals 3(+) and 2(-) = +15 Vdc; terminals 1(+) and 2(-) = -15 Vdc.
If incorrect, replace control board (40).
♦
Replace current transducer (5) and/or control board (40).
CURRENT OUTPUT TEST WITH OPEN-CIRCUIT POWER SOURCE.
Control board (40), connector J4, terminals 4(+) - 2(-) = 0 Vdc, +/- 20 mVdc, with start button
pressed (output current signal with open-circuit power source).
YES
NO
♦
Check the wiring between current transducer (5) and J4 control board (40).
♦
With power source off, temporarily disconnect J4 from control board (40) and
check the resistance on terminals 4 and 2 of J4 on control board (40) =
approximately 9 Kohm. If incorrect replace control board (40).
♦
Make sure there are no leaking or short-circuited components connected to the
power source output terminals.
♦
Replace current transducer (5).
♦
Replace control board (40).
3.302.221
15/01/07
Summary of Contents for TIG 250 AC-DC
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