Miller XMT 456CV Kullanıcı El Kitabı - Sayfa 32
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6-3. Removing Case and Measuring Input Capacitor Voltage
1
Tools Needed:
5/16 in.
OM-203 034 Page 28
4
Typical Bleeder Resistor
1
2
+ lead to lower right
terminal, − lead to
upper right terminal
25 to 1000 ohm,
5 watt resistor
#16 AWG 1000 volts DC
insulation rating, approx.
3 in. (76 mm) leads
3
!
Turn Off welding power
source, and lockout/tagout
input power before pro-
ceeding.
!
Significant DC voltage can
remain on capacitors after
unit is Off. Always check the
voltage as shown to be sure
the input capacitors have
discharged before working
on unit.
1
Outside Handle Screws
To loosen top, remove two outside
handle screws from both handles
and all side bolts.
2
Interconnecting Board PC2
3
Voltmeter
Measure the DC voltage across the
screw terminals on RC3 and RC5
as shown until voltage drops to near
0 (zero) volts.
.
If the capacitor voltage does
not drop to near zero after sev-
eral minutes, use a bleeder re-
sistor of between 25 and 1000
ohms, at least 5 watts, #16
AWG 1000 volts DC insulating
rating wire to discharge the ca-
pacitor(s) .
4
Typical Bleeder Resistor
An example of a typical bleeder re-
sistor is shown on this page.
Proceed with job inside unit. Rein-
stall right side panel when finished.
802 260 / 801 536