gala gar GAR CONTINUOS 450 Manuel Technique D'instructions page 34

3.8 ADJUSTMENTS IN THE GAR CONTINUOS LINE EQUIPMENT.
The GAR CONTINUOS LINE equipment may only require the control unit to be adjusted.
adjustment is carried out in an operation prior to it leaving the factory. If for any reason, such as carrying out a
repair, one of the electronic plates of the control unit has to be adjusted, proceed as follows (See Figure 14, as well
as electrical drawing of the control system which can be seen in the appendices.):
Figure 14. Access to control system.
A
B
Adjustment of minimum and maximum current.
1 – Adjust the I2 trimmer of plate PM-1 in order to
max
verify that the voltage between pins 7 and 10 of CN1
of plate RE-243B are the ones corresponding to table
5. To do this, the equipment must be in vacuum. We
must check that the setpoint voltage that reaches the
control plate undergoes the variation expressed in the
table when the welding current potentiometer is moved
(10mV/A).
Table 5. Adjustment of the set point voltage.
EQUIPMENT
GAR CONTINUOS 450
GAR CONTINUOS 550
GAR CONTINUOS. Instructions Manual.
U
7-10 (CN1-RE-243B)
POTENTIOMETER POSITION
LOCAL INTENSITY
MINIMUM MAXIMUM
0 V 4.5 V
0 V 5.35 V
A)- Remove the screws from the front plate (mark A).
B)- Pull the front plate. The control unit will come out like
a drawer.
As you can see in the electrical drawing of the control
unit (found in appendices) the control unit is comprised of
two electronic plates:
Controls electronic plate PM-1.
Electronic control plate RE-243B.
2 – Place the equipment in TIG working mode and
take the current control LOCAL potentiometer to its
minimum position. Place the welding circuit in short-
circuit (First, switch off the machine).
3- Measuring the welding current, move the I2
trimmer of plate RE-243 until the welding current is
established at 5 or 6 A.
saturated areas, without adjustment, in the LOCAL
welding current potentiometer.
4- Increase the welding current value with the LOCAL
control potentiometer to the value expressed in table 6.
Table 6. Dial point. Adjustment of I2
EQUIPMENT
GAR CONTINUOS 450
GAR CONTINUOS 550
5- Measuring the welding current, move the I2
trimmer of plate RE-243 until the welding current is set
at the value of the dial selected.
Page 34
In principle this
min
Avoid the existence of
max
DIAL POINT
120 A
140 A
max