Checking The Open-Circuit Voltage - Fronius Transpocket 1500 Erdstrom Serviceanleitung, Ersatzteilliste

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Checking the

- Shift the mains switch to the "O" position and unplug the machine from the mains

minimum

- Connect the shunt and power resistor to the welding sockets of the power source

welding

- Set the welding-current dial to Minimum

amperage

(continued)

Open the housing (see the section headed: "Opening the housing")

- Plug the machine into the mains and shift the mains switch to the "I" position

- Select the welding process "rod-electrode welding"

- Measure the minimum welding current using the shunt and power resistor

- Adjust the potentiometer (2) - Fig.3 - on the LCA15 board, until the exact value for

- I

It is recommended to measure the open-circuit voltage as a peak value. For taking this

Checking the

measurement, use the specially designed measuring circuit.

open-circuit

voltage

In the drawing, the measuring circuit can be found beneath the heading "Variant 1:

Measuring the peak value using the measuring circuit".

Alternatively, if the measuring circuit is no longer available, the RMS value can be

measured.

Variant 1: Measuring the peak value using the measuring circuit

Fig.5

- Set up the measuring circuit as shown in the illustration above

- Shift the mains switch to "O" and unplug the machine from the mains

- Connect the measuring circuit, together with the voltmeter, to the welding sockets

- Plug the machine back into the mains and shift the mains switch to "I"

- Set the welding-current dial to Maximum

- Select the welding process "rod-electrode welding"

- Peak value of open-circuit voltage = approx. 92 V

If the open-circuit voltage is not within the tolerance range, this may mean that the

LCA15 board or the potentiometer are faulty.

Warnung! An electric shock can be fatal. This test is performed with the power

source switched on and the housing opened up. As long as the power source is

plugged into the mains, do NOT under any circumstances touch the power

source or any of its components. Follow these instructions even after

unplugging the power source from the mains. The capacitors are still charged -

and still very dangerous!

the maximum welding current (10 A) is reached

= 10 A

min

Note! The RMS value can only be of any help in detecting a defect in the

power source in the event of very severe deviations from the desired value.

1N4007 or

equivalent