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The so-called automode is a tool for monitoring the
duration of the bead build-up stage and moving on
automatically from the bead build-up to the heating
Info
stage by decreasing the applied pressure. However,
this requires that the automode was enabled in the
configuration menu. In this case, with enabled au-
tomode, Display 23 is shown. Then, to use that bead
build-up time saved at the last welding operation,
press START/SET. Pressing STOP/RESET will cancel the
automode for bead build-up. If the bead build-up is
automode-managed, the build-up time is displayed
as a countdown, and from 10 sec prior to when pres-
sure must be decreased, the audible signal can be
heard.
At the start of the bead build-up stage, place the heating
element ("hot plate") between the pipe butts. The display
tells you so. If the heating element is not sufficiently hot at
this point, an information message on the screen asks you
to wait a little longer.
Then close in the movable carriage using the carriage mov-
er lever and wait for the weld bead to reach the required
height or width, depending on the selected welding stan-
dard. Observing the bead is also highly recommended in the
automode, even though the bead height is not indicated
on the screen during an automode-managed bead build-up
stage.
4.3.5
Heating Stage
After the bead build-up stage (1
gram on the control unit) was completed, pressure must be
decreased (2
LED in the diagram). The decreased pressure
nd
will then be applied for the entire duration of the heat-
soaking stage (3
rd
butts continue to soak heat from the plate.
When the bead build-up stage is not automode-managed,
the pressure is decreased either with the manual pressure
release valve or with the START/SET key, and the decrease
has to be monitored on the display. When the START/SET
key is used, the hydraulic and control unit keeps the heat-
ing pressure below the required maximum throughout the
heating stage by re-opening the release valve as needed if
the pressure rises. If the welder uses the pressure release
valve, this automatic control is not available. In this case, it
is the operator's responsibility to compensate for potential
pressure fluctuations.
The machine also moves on to the heating stage if the weld-
er 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.
24
EN
LED in the welding dia-
st
LED in the diagram), in which the pipe
Weld Control 250 User's Manual
O . M . I . S . A . S r l
Via Verga 9/11
20845 Sovico (MB), Italy
****
AUTOMODE
****
Use last bead
build-up time?
RESET
SET
Display 23
Put in heat. plate
222°C
NOM.
16.5bar
221°C
ACT.
0.5bar
Display 24
Bead Height
:2.0mm
Bead Build Time:68 s
230°C
NOM.
16.5bar
229°C
ACT.
12.5bar
Display 25
HEAT SOAK PHASE
Heat Soak Time :148s
230°C
MAX
5.0bar
229°C
ACT.
3.5bar
Display 26
Version November 2022_1
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