Output Voltage On Resistive Load Operation Not Regular - Cebora SYNSTAR 200 M Manual De Servicio

♦ Check the conditions of the secondary diodes
group (D22 ÷ D29), inductor L7 and the corre-
sponding connections on the power board (45)
printed circuit (for inspection remove the ven-
tilation tunnel on power board (45)).
♦ Check the conditions of the TF5 power trans-
former on power board (45). If you notice
burn signs or deformities, replace it.
♦ Replace power board (45).
■ Check the wiring between J7 power board (45) and J1
panel board (48).
■ Check correct fixing and connections cleaning of the
INV board on power board (45) J4 connector.
■ Check condition of the inverter power components
(U8, U9, U10, U11, U12, U13, D13, D14, etc.) on power
board (45). If you notice any signs of burns or deforma-
tion, replace them.
3.3.9 Output voltage on resistive load operation not
regular.
OPEN CIRCUIT OUTPUT VOLTAGE TEST.
□ Output terminals C(+) and D(-) on power source = ap-
proximately +96 Vdc, depending on polarity reverser
position, with start button pressed.
YES
EN
♦ Carry out the test in par. 3.3.8.
For the following tests use a resistive load capable of with-
standing the maximum power source current. The appro-
priate values are shown in the table.
Resistive
Program
resistance
E71TGS
0.9 mm
OUTPUT VOLTAGE ON RESISTIVE LOAD TEST.
□ For this test, set the E71TGS 0.9mm MIG program in
"2 step" mode:
− press knob B for a time longer than 2 s to enter the
Service Functions menu;
− briefly press the knob B to access the program se-
lection page;
− rotate knob B to select E71TGS 0.9mm;
− briefly press the knob B to exit the program selec-
tion page;
− if necessary rotate knob B to select 2T;
− press knob B for a time longer than 2 s to exit the
Service Functions menu and save the selections;
26
Correct?
NO
NOTE
Power
load source out-
put current
0,12 Ω 200 Adc
− rotate knob B to select the maximum output current
(200 A).
□ Output terminals C and D on power source = values as
shown in the table, with start button pressed.
♦ Regular operation.
INVERTER POWER SUPPLY TEST.
□ Power board (45), R32 SHUNT(-) terminal (in proxim-
ity of inductor L3) and dissipater DISS2(+), voltage =
+395 Vdc approximately, with power source on resis-
tive load, in the table conditions (Vdc on DC-capaci-
tors, with boost converter working and power source
on resistive load).
♦ Perform tests of par. 3.3.1 with particular
♦ Replace power board (45).
■ Check the wiring between terminals VITE1 and
VITE2 on power board (45), polarity reverser and
power source output terminals C and D. If you find
loose connections, tighten and replace any damaged
components.
■ Check the wiring between J7 power board (45) and J1
panel board (48).
■ Check correct fixing and connections cleaning of the
INV board on power board (45) J4 connector.
■ Check condition of the inverter power components
(U8, U9, U10, U11, U12, U13, D13, D14, etc.) on power
Power
board (45).
source out-
■ Replace power (45) and/or panel (48) boards.
put voltage
24 Vdc
NO Correct?
YES
YES Correct?
NO
attention to the POWER SUPPLY TEST
concerning the boost converter and the pre-
charge circuits operation.
3302316/A