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WELDERS ITEM 8201N ÷ 8214N
EDITION: MAY 2008 PAGE 16 OF 32
4.2.2 LOW FORCE SQUEEZE PNEUMATIC CIRCUITS ADJUSTMENT
(OPTIONS 8238-8239)
On request, the welder can be equipped with a pneumatic circuit enabling the low force squeeze,
useful especially for projection welding and with light alloys. The pneumatic circuit functioning
varies according to the used pneumatic cylinder:
SINGLE STAGE (STANDARD)
DOUBLE STAGE (OPTION 8235)
The head low force descent is obtained by
supplying both the cylinder lower and upper
chamber. When the descent is over (after the
1° SQUEEZE) the back pressure is removed
in order to obtain the welding force.
The head low force descent is obtained by
supplying both the cylinder lower chamber and
one of the cylinder upper chambers. When the
descent is over (after the 1° SQUEEZE) the
back pressure is removed and the other upper
chamber is supplied in order to obtain the
welding force.
The electrodes force adjustment is carried out by means of the pressure regulator REG1. This
carries out the pressure P1 adjustment, displayed by pressure gauge MAN1, modifying both the
welding and the squeeze force.
Upon demand, it is possible to have a proportional valve EVP to adjust the working pressure
directly from the control unit and to combine a proper pressure value to each program. Assures
constant and accurate working pressure.
The reached force values, concerning the different pressure values showed on the pressure
gauge, are listed in the following table:
PRESSURE
CYLINDER
∅
125
(STANDARD)
CYLINDER
∅
125
×
2
(OPTION 8235)
bar
kPa
FORCE in daN
FORCE in daN
0,5
50
61
103
1
100
122
207
2
200
245
414
3
300
368
621
4
400
490
828
5
500
613
1035
6
600
736
1242
The head descent speed adjustment is carried out by means of the flow regulator RFL2; the rise
speed adjustment is carried out by means of flow regulator RFL1. The flow regulator RFL3 must
be used in order to carry out the double stroke descent speed adjustment.
