Dedicated Welding Unit Information; Displaying Characteristics Of The Welding Unit; Measuring Resistance; Overheating Switch - Hürner HCU 300 Bedienungsanleitung

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Dedicated Welding Unit Information

9.1

Displaying Characteristics of the Welding Unit

The key technical information on the welding unit itself is
displayed by holding the ð key down at the "Enter Fitting
Code" screen. They are the software version, the (serial)
number of the unit, the date of the next scheduled main-
tenance, and the number of currently available, unused
reports.
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 generator power supply. This message has to
be acknowledged by pressing START/SET.
9.2

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 entered as part of the read fitting
code. If the gap between the two values is smaller than
the acceptable tolerance given in the code, the welding
process starts. If the gap is greater than the preset tol-
erance, the welding unit aborts welding and displays a
"Resistance Error" message. 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.
9.3

Overheating Switch

The welding process aborts if the temperature of the
transformer in the welding unit is too high. The overheat-
ing 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.
9.4 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 extension cable, or a tripped
cut-out in the mounting box. The next welding operation
Version August 2017 HÜRNER HCU 300 User's Manual
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