Version June 2020
16
EN
SPG 2.0 User’s Manual
O . M . I . S . A . S r l
Via Verga 9/11
20845 Sovico (MB), Italy
4.4.5 Heating Stage
After the bead build-up stage (1
st
LED in the welding diagram) was
completed, pressure must be decreased (2
nd
LED in the diagram). The
decreased pressure will then be applied for the entire duration of the
heat-soaking stage (3
rd
LED in the diagram), in which the pipe butts
continue to soak heat from the plate.
Important
If decreasing the pressure to heating pressure takes longer
than 10 sec, the welding process aborts and throws an
error.
The pressure decrease has to be observed on the display. It is under
the operator’s responsibility to respond to possible pressure fluctua-
tions.
The machine also moves on to the heating stage if the welder decreases
the pressure to a level below the heat-soaking maximum before the
countdown of the bead build-up stage is completely over – which may
happen if the bead is o.k. earlier than expected. However, such a pres-
sure decrease has to be quick. In these cases, the bead build-up time
shortened by the early decrease is saved to memory as the build-up
time for this welding and will be used as a reference.
Important
Full contact has to be continuously established between the
heating plate and the bead, even with lower pressure. While
heating, if contact between them is lost somewhere along the
circumference, welding has to be aborted and repeated.
If the control unit detects an error (such as insufficient pres-
sure not readjusted by the welder or excessive heating time),
it also aborts welding and displays an error message.
4.4.6 Change-over Stage
Info
An audible signal indicates the imminent change-over
d u r i n g t h e l a s t 1 0 s e c o n d s o f t h e h e a t - s o a k i n g
stage.
At the end of the heating stage, move the carriage apart. Then remove
the heating plate from in-between the pipes. The count-down of the
heating time has to be complete. It is prohibited to remove the pipe
butts away from the heating element early. Only when Dispay 28 shows
on the screen, it is acceptable to end the heating stage.
The change-over has to be followed immediately by the joining stage.
The change-over time given on the display must not be exceeded. If it
is, the welding is aborted automatically and an error is displayed.
4.4.7 Joining and Cooling Stage
Build the joining pressure while watching the value on the screen.
Building the joining pressure must correspond to a linear increase, as
predicted by the nominal values on the screen. The 5
th
LED of the dia-
gram on the hydraulic unit flashes. In the joining and cooling stage it
is particularly important to keep the pressure at the nominal level.
Important
Right after the end of the linear pressure ramp, at the very
beginning of the cooling, pressure may drop slightly for
technical reasons. The welder has to compensate for this drop
immediately. In this case, the first line of Display 30 reads,
“Keep the pressure.”
Depending on the welding standard used or on information provided
HEAT SOAK PHASE
Heating Time :148s
230°C MAX 5.0bar
229°C ACT. 3.5bar
Display 27
COOLING PHASE
Cooling time :1234s
230°C NOM. 16.5bar
229°C ACT. 16.5bar
Display 30
Build Joining Press.
230°C NOM. 16.5bar
229°C ACT. 14.5bar
Display 29
Remove plate
Change-over : 8 s
230°C MAX 5.0bar
229°C ACT. 3.5bar
Display 28
