Miller Electric Axcess 450 Manuel du propriétaire télécharger pdf (Page 44)

OM-250 720 Page 38

9-3. Removing Cover and Measuring Input Capacitor Voltage

! Turn Off welding power

source, and disconnect

input 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.

Turn Off welding power source, and

disconnect input power.

Remove cover

1 Power Interconnect Board

PC2

2 Voltmeter

Measure the DC voltage across the

+ bus terminal and − bus terminal on

PC2 as shown until voltage drops to

near 0 (zero) volts. Measure input

capacitor voltage on both inverter

assemblies before proceeding.

. 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).

3 Typical Bleeder Resistor

An example of a typical bleeder

resistor is shown on this page.

Proceed with job inside unit.

Reinstall cover when finished.

Tools Needed:

8 mm (5/16 in.)

802 985 / 248 977-A

+ lead to left bus terminal, − lead to right bus terminal

Typical Bleeder Resistor

#16 AWG 1000 volts DC

insulation rating, approx

76 mm (3 in.) leads

25 to 1000 ohm, 5

watt resistor

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 63 64

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Miller Electric Axcess 450 Manuel du propriétaire Page 44

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