Saf-Fro PRESTO 300MV Instructions For Use Safety And Maintenance Download Page 10

Page: 10 / 94

EN-10

$!/=!$Q%

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Idle mode for:

VRD ON at end of welding: this function reduces the voltage at

the output leads.

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machine is overheated and the output has been disabled.

| X !

Defectiveness for:

Fault in supply / control stage.

Fault in output stage.

Power inverter broken.

Ref.15. With red LED lit, use the Encoder control knob to adjust the welding

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normally is turned ON; it’s OFF only when the Hot Start or Arc
Force function is activated.

Ref.16. Yellow LED will turn ON when the machine is overheated and the

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occurs when the duty cycle of the machine has been exceeded.
Leave the unit ON to allow the internal components to cool. When
the yellow indicator turn OFF, normal operation is again possible.

$!/j!$Q% < +$!/& '

Force to be set from 0 to 75 in steps of 1 by the Encoder Control
<$!&!Zj@ '!"
$!?!" '<
welding is not being carried out.

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Start to be set from 0 to 99 in steps of 1 by the Encoder Control
<$!&!Z Z!"
$!?!" Z<
welding is not being carried out.

Ref.19. Welding process selection key: MMA or TIG with Lift Arc.

Fig.8

6 - HUMAN INTERFACE (HI) PRESENTATION

6.1 - CONTROLS AND OPERATIONAL FEATURES

The

HUMAN INTERFACE (HI)

is located on the front panel of the unit

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}      }
                ~
IN CONJUNCTION WITH ONE OF THE INPUT VOLTAGE LEDS
~~
MAINS CONNECTED TO THE UNIT.

For all front panel switch pad controls: press
switch pad to turn on light and enable function.

At times the information on the state of the unit
are given simultaneously by two LEDs; read
section 6.2. below.

The following pre-settings and visualizations are available (see
Fig.8):

Ref.2.

Ammeter display actual amperage while welding. Meter also
displays preset parameters for any of the following units of measure
when they are active: Amperage, Hot Start. Arc Force and VRD. The
corresponding LED, will also illuminate.

Ref.3. Encoder Control Knob: use it in conjunction with applicable front

panel function switch pad to set values for that function.

Ref.10. Green LED blinks in conjunction with Ref.11. with abnormal input

voltage or phase loss.

Ref.11. Red LED lights up or blinks in conjunction with Ref.10. with

abnormal input voltages or phase loss.

Ref.12. Selection key for two functions:

Arc length: to set the arc length in MMA welding process, press each
+<{

L = soft arc: for welding with a low spatter presence.

M = crisp arc: for welding with an increased arc stability.

conditions or with cellulosic & aluminum electrodes.

VRD: some national regulations or special work environments
require the use of reduced no-load voltage. To set the VRD function
ON or OFF press the key once for 5 sec. When activated the VRD
function is signaled on the display with the letters “Urd” each time
the unit is powered; if the function comes deactivated, on the display
disappear one by one the letters “Urd”. As default from factory the
device is OFF.

Ref.13. Selection key for two functions:

ZQ"{ZQ" <
LED is illuminated and use in conjunction the Encoder Control Knob
to set values for that function.

Remote control: allows operator to use remote amperage control
if desired. Connect the remote control device to the remote 10
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activate or deactivate the device press the key once for 5 sec.

Attention: the maximum welding current from remote will be
that set with the Encoder Control Knob (Ref.3).

HUMAN INTERFACE (HI) PRESENTATION