ESAB A2281 Feeder on Fabricator 281 Troubleshooting instruction

TECHNICAL

BULLETIN

Date: 01-11-08

Product: A2281 Feeder on Fabricator 281 By: Jorge Santana

Subject: ON/OFF switch

7977847PKD

Summary: Green indicator going out

THERMAL ARC TECHNICAL SUPPORT

Phone: 1-800-462-2782

Fax: 1-603-298-7402

www.thermadyne.com

Form 0004

82 Benning Street

West Lebanon, NH 03784

1-603-298-5711

Fax: 1-800-221-4401

“Exceeding Customer Expectations Through Performance Excellence"

Valued Thermadyne Service Provider,

It has come to our attention that in some cases the Green Light (LED) in the ON/OFF switch of the

A2281 Feeder may go out.

The reason of this situation is that the LED did not have a reverse diode. On the negative half cycle of

the AC waveform, the LED could see reverse voltages higher than its maximum PIV (Peak Inverse Voltage).

With the addition of the reverse diode, the maximum PIV will be limited to the forward voltage drop

of the diode.

Nevertheless this situation WILL NOT

interfere nor affect with the functionality of the equipment.

All switches going forward will have the correct diode and resistor to prevent lamp failure.

Any new stock you receive from Thermal Arc on the p/n

7977847PKD will be to the latest spec.

Please do not hesitate to contact us if you have any questions.

For More information Contact:

Green LED

Reverse Diode

Resistor

Reverse Diode & Resistor installed

“inside” the 7977847PKD switch.