Miller ICE-27T 소유자 매뉴얼 - 페이지 24

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6-4. DC Bus Voltage Check

Tools Needed:

Torx 25

OM-225 216 Page 20

Y 440 Volts DC can be present on the capacitor bus

and significant DC voltage can remain on

capacitors after unit is Off. Always check the

voltage on inverter assembly as shown to be sure

the input capacitors have discharged before

working on unit.

Y Turn Off welding power

source,

and

input power.

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

discharged before working

on unit.

Remove wrapper from unit (see

Section 6-3).

Circuit Board PC1

Voltmeter

TP5 Pin 5

TP5 Pin 1

Y Check DC bus voltage before

servicing. Set multimeter to

read voltage. Check voltage

between TP5 pins 1 and 5. Volt-

age should read 5 volts DC or

less.

If the capacitor voltage does

not drop to near zero after

several minutes, use a bleeder

resistor of between 200 and

500 ohms, at least 10 watts,

and #16 AWG 600 volts ac in-

sulation rated wire to discharge

the capacitor(s).

Typical Bleeder Resistor

An example of a typical bleeder

resistor is shown on this page.

Proceed with job inside unit.

Reinstall wrapper when finished.

Typical Bleeder Resistor

200 to 500 ohm, 10 watt

wire wound resistor

#16 AWG 600 Volts AC

Insulation Rating

disconnect

Ref. 804 506-B