Aborted Welding Process; Cooling Time; Returning To The Start Of Parameter Input; Dedicated Welding Unit Information - Hürner HST 300 aquatherm 2.0 Manuel Utilisateur

a q u a t h e r m G m b H
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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 will be displayed at the end of the welding process
and will be counted down to zero. This countdown can be acknowl-
edged and canceled at any time by the STOP/RESET key. However, note
that for that time the pipe fitting joint which is still warm must not
be subjected to an external force.
5.9

Returning to the Start of Parameter Input

After welding is finished, disconnecting the welded fitting from the
unit or pressing the STOP/RESET key will reset the unit back to the
start, i. e., entering the component size.
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 and the serial number of the unit. To quit this screen,
press the STOP/RESET key.
6.2

Measuring Resistance

When the START/SET key was pressed to initiate a welding process,
the resistance value of the fitting is measured and compared to the
value that matches the entered component diameter. If the gap be-
tween the two values is smaller than the acceptable tolerance, the
welding process starts. If the gap is greater than that tolerance, the
welding unit aborts welding and displays a "Resistance Error" mes-
sage. Furthermore, it displays the actual resistance 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,
unless the remaining welding time is short enough to warrant that
there will not be any damage or hazard. The display and the welding
report will show an "Overheated" message. While the temperature is
excessive, it is impossible to start a new welding operation.
6.4

Indication of Power Supply Failure at the Last Welding

The message "Power Supply Failure Last Welding" indicates that
the previous welding aborted because of a power supply failure.
The reason may be too weak a generator or too long or too thin an
Version July 2014 HST 300 aquatherm 2.0 User's Manual
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