HURNER Hydraulic 250 Manual De Instrucciones página 22

4 Operation
4.1 Start of Operation, Switching the Machine on
Before the control unit is turned on, check the oil level of the
hydraulic and control unit and top up with HF-E 15 hydraulic
oil as needed.
Important
The surfaces of the heating element have to be free of grease
and clean, or they have to be cleaned.
Important
Make sure all connectors are tight in their sockets and note
that operation on a worksite is only acceptable if the power
Important supply has earth-leakage circuit breakers.
After the power supply cord was connected to the mains power supply
or a generator, the machine is ready for operation.
It has to be ensured that the voltage of the power source the
machine is connected to corresponds to the rated voltage of
the machine. Also the following has to be respected when
using extension cables:
Caution
For 230 V power: wire section 2.5 mm² = max. 75 m long
Using the Integrated Heating Element Temperature Control
When the machine was connected to the power supply, the control
electronics runs an auto-test of the three-digit 7-segment display
screen. This is indicated by three short flashes of all segments. After
the test, the software switches to control mode, which is recognizable
from the display now showing a number. This number corresponds to
the currently set nominal temperature of the heating element.
As long as the actual temperature of the heating element is not equal
to the required nominal temperature (lower or higher), the display
screen flashes. This indicates in most cases that the heating element
is heating up. When the nominal temperature is reached, providing it
is reached within the specified tolerances and time delays, the display
screen stops flashing and the heating element can be used.
The value of the nominal temperature can be changed using the
DECREASE/INCREASE TEMPERATURE keys, either by pressing them re-
peatedly or by holding them down. The settable temperatures range
from 190°C through 250°C. When this setting was changed, the screen
starts flashing again, until the heating element has reached the new
nominal temperature. The new value is saved to memory and can be
used again after the machine is switched on again. To see the current
actual temperature of the heating element, hold down both tempera-
ture keys. A dot in the lower right-hand corner of the display indicates
that the actual temperature is showing.
4.2 Welding Process Overview
The welding process proper, after pipe butt facing and pipe align-
ment check, has the following four stages, or phases, which are also
illustrated by the time-and-pressure diagram below.
• Bead Build-up Stage – In this stage, t
are pressed against the heating element and heated to the tem-
perature of it; to ensure consistent bead formation, do this at
drag pressure (P ) plus P
t
Appendix.
10
EN
wire section 4.0 mm² = max. 100 m long
in the diagram, the pipes
1
from the welding value tables in the
1
HÜRNER Manual Hydr. 250 User's Manual
H Ü R N E R S c h w e i s s t e c h n i k G m b H
Nieder-Ohmener Str. 26
35325 Mücke, Germany
Version October 2020