ESAB MultiPower 460 Pulse Manual de instrucciones descargar pdf (Pagina 44)

SECTION 5 MAINTENANCE

I. Troubleshooting

If the power source is operating improperly, the following troubleshooting information may be used to locate the source

of the trouble.

Check the problem against the symptoms in the following troubleshooting guide (Table 5-1.) The remedy for the problem

may be quite simple. If the cause cannot be quickly located, open up the unit and perform a simple visual inspection of all

the components and wiring. Check for proper terminal connections, loose or burned wiring or components, blown fuses,

bulged or leaking capacitors, or any other sign of damage or discoloration.

Inspect the diode to determine if it is of the “ straight polarity “ or “reverse polarity” type. Refer to the following ﬁgure for

typical marking of diode polarity. It is essential that a replacement diode be of the same polarity as the one removed.

Reverse

Polarity

Diode

Anode

Stud

Straight

Polarity

Diode

Cathode

Stud

Positive side

of bridge

Positive side

of bridge

Negative side

of bridge

Negative side

of bridge

A = Anode

K = Cathode

Pigtail

H. Procedure for Checking Diodes

Usually when a diode fails, it becomes a short circuit. A simple diode test uses the resistance circuits of a multimeter; the

diode should show better conductivity in one direction than in the other.

TEST AS FOLLOWS:

Set the mulitmeter on the low resistance range.

Connect one lead to the stud and one lead to the pigtail. Read the Resistance.

Reverse the leads and read the resistance. It should show a higher resistance in the “blocking” direction than in

the “conducting” direction. If it shows a very low, resistance (or zero resistance) in both directions, the diode is

shorted. If it does not show continuity in either direction, the diode is open.

As stated above, it is essential that a replacement diode must be of the same size, type, and polarity as the one it replaces.

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ESAB MultiPower 460 Pulse Manual de instrucciones Pagina 44