Version July 2014
EN
9
HÜRNER HST 300 Monofuse 2.0 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
5.5 Welding Process
The welding process is monitored for its entire duration applying
the appropriate welding parameters. The welding voltage, the resis-
tance, and the welding current are displayed in the lower line of the
screen.
5.6 End of Welding
The welding process ends successfully if the actual welding time cor-
responds to the nominal welding time and the buzzer can be heard
twice.
5.7 Aborted Welding Process
The welding process has failed if a plain-text error is displayed on the
screen and the audible signal buzzes continuously. An error has to be
acknowledged by pressing the STOP/RESET key.
5.8 Cooling Time
The cooling time as given in the fitting manufacturer’s instructions has
to be respected. Note that for that time the pipe fitting joint which is
still warm must not be subjected to an external force.
6
Dedicated Welding Unit Information
6.1 Displaying Characteristics of the Welding Unit
The key technical information on the welding unit itself is displayed
by pressing the
ð
key at the “Contact Fitting” screen. They are the
software version, the serial number of the unit, and the date of the
next scheduled maintenance. To quit this screen, press the STOP/RESET
key.
If the scheduled service is overdue, a service due message appears on
the screen as soon as the unit is plugged into the mains or genera-
tor power supply. This message has to be acknowledged by pressing
START/SET.
6.2 Measuring Resistance
When the START/SET key was pressed to initiate a welding process,
the resistance value of the fitting is measured. If the value is out of
the preset tolerance, the welding unit aborts welding and displays a
“Resistance Error” message. Furthermore, it displays the actual resis-
tance value measured for the connected fitting.
The reason for a resistance error may be poorly contacting and/or worn
connection terminals. Therefore, if this error occurs, check them for
proper fit and, if worn, replace them with new ones.
6.3 Overheating Switch
The welding process aborts if the temperature of the transformer in
the welding unit is too high. The overheating circuit breaker for the
transformer stops the welding if the temperature reading is too high
and the remaining welding time is longer than 800 seconds. The display
and the welding report will show an “Overheated” message.
6.4 Indication of Power Supply Failure at the Last Welding
The message “Power Supply Failure Last Welding” indicates that
