Red-D-Arc EXTREME 360, Техническое руководство

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PRE-POWER CHECKS
TM-229 409 Page 19 Extreme 360
Ref. 803 721-B / 907 161
6-3. Measuring Input Capacitor Voltage
Y Turn Off welding power
source, and disconnect input
power.
Remove cover
1
Power Interconnect Board
PC2
2 Voltmeter
3 Capacitor C12
Measure the dc voltage across
C12 (+) Positive Terminal and C12
( − ) Negative Terminal on PC2 as
shown until voltage drops to near
0 (zero) volts.
4
Capacitor C13
Measure the dc voltage across
C13 (+) Positive Terminal and C13
( − ) Negative Terminal on PC2 as
shown until voltage drops to near
0 (zero) volts.
.
If the capacitor voltage does not
drop to near zero after several
minutes, use a bleeder resistor
of between 25 and 1000 ohms,
at least 5 watts, #16 AWG 1000
volts dc insulating rating wire to
discharge the capacitor(s) .
5 Typical Bleeder Resistor
An example of a typical bleeder re-
sistor is shown on this page.
Proceed with pre-power flowchart.
Y
Significant DC voltage can
remain on capacitors after
unit is Off. Always check the
voltage as shown to be sure
the input capacitors have dis-
charged before working on
unit.
1
2
Positive (+) lead to C12 (+) terminal,
Negative ( − ) lead to C12 ( − ) terminal
3
1
2
Positive (+) lead to C13 (+) terminal,
Negative ( − ) lead to C13 ( − ) terminal
4
Test Equipment Needed:
Typical Bleeder Resistor
25 to 1000 ohm,
5 watt resistor
#16 AWG 1000 volts dc
insulation rating, approx.
3 in (76 mm) leads
5