Miller AlumaPower 450 MPa Manuale d'uso - Pagina 40
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8-3. Removing Case and Measuring Input Capacitor Voltage In 400 VAC Models
Tools Needed:
5/16 in.
OM-257219 Page 34
.
A complete Parts List is available at www.MillerWelds.com
4
Typical Bleeder Resistor
1
2
400 VAC input:
+ lead to lower
terminal, − lead to
upper terminal
25 to 1000 ohm,
5 watt resistor
#16 AWG 1000 volts DC
insulation rating, approx.
3 in. (76 mm) leads
3
3
!
Turn Off welding power
source, and disconnect in-
put power.
!
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
Right Side Panel
To remove panel, remove screws
securing panel to unit.
2
Interconnect Board PC2
3
Voltmeter
Measure the DC voltage across the
screw terminals on PC2 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.
Ref. 277764-A / Ref. 256682-B