ESAB DTE 255 - Page 9

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EV01 Cooling fan, DC unit (230V AC).
EV02, EV03 DTE 255: Cooling fans, AC unit (230V AC).
To check if the fans are electrically sound: disconnect the supply to the fans
and measure their resistance with an ohmmeter across terminal XT23. The
resistance must be 315Ω ±15Ω for the two f ans in parallel.
DTE 200: Supplied with only one fan (EV02) for the AC unit.
L01 Primary inductor.
L02 Secondary inductor.
L03 4 ferrite ring cores, included in TM01. Reduces transients to/from
transformer TM01.
L04 2 ferrite ring cores. Reduces transients to/from the mains.
L05 1 ferrite ring core. Reduces transients from the shunt.
Q01 -- Q02 DTE 200: I GBT modules, AC unit.
See Test and Fitting Instructions on page 63.
Q01 -- Q04 DTE 255: IGBT modules, AC unit.
See Test and Fitting Instructions on page 62.
Q05 IGBT module, DC unit. See Test and Fitting Instructions on page 61.
QF01 Main power supply switch.
R03 Current limiting resistor for C09.
R05 Resistor. With capacitor on AP09, forms a snubber circuit from positive t o
negative.
RS01 Shunt. 250A/60mV
ST01, ST03 Thermal sensors (PTC). Sensing the temperature at Q5 (ST01) and in
TM01 (ST03). When the temperature exceeds 50_C the fans run at high
speed. When it exceeds 75--80_C, welding is stopped until the t emperature
drops.
When the temperature is below 30_C, the. resistance of the PTC resistor is
between 50 and 150Ω..
ST02 Thermal switch (PTC). Sensing the temperature of the AC heat sink. When
it exceeds 75--80_C, welding is stopped until the temperature drops.
When the temperature is below 30_C, the resistance of the PT C resistor i s
between 50 and 150Ω..
TC01 Control transformer. Fuses included, see the circuit diagram.
TM01 Main transformer. Supplies the main current circuit. Has an additional
winding f or HF start voltage.