11
HF pulse generator HF-DC1/42 and ZGP1/8.0-42
11/1
Before all work on the pulse generator, switch off the supply voltage and remove the mains
plug! Repairs by electricians only.
11.1
Technical data
Type HF pulse generator
HF-DC 1/42
ZGP 1/8.0-42
Nominal input voltage
42VAC
42VAC
Permissible deviation
+/- 10%
+/- 10%
Rated frequency
50/60Hz
50/60Hz
Rated input power
5VA
12VA
Rated output peak voltage
8kV
8kV
11.2
Application
Pulse generators for installation in current sources or electrical cabinets serve for non-contact
ignition of the arc for welding with direct current.
Optimum ignition characteristics are only ensured with torch tube package lengths up to
max. 8m.
11.3
Maintenance
The internal pulse generator, designed to ignite and stabilise the arc, delivers high-voltage ignition
pulses whose power is to be applied without losses to the electrode.
However, any dirt, dust, moisture, oil etc. reduces the insulating properties of the required air and
creep gaps. It must therefore be ensured that the equipment is looked after and kept clean by
regular maintenance.
This also applies particularly to the torches (often heavy contamination in the area of the grip).
Contamination here often becomes noticeable when the HF leads to "electrification". In principle, the
applied HF is safe (high frequency characteristics, so-called skin effect), but can lead to startled
reactions. When the HF becomes noticeable, it takes routes which reduce the power at the gap
between the electrode and the workpiece. It is therefore essential to ensure that the torches are
clean and looked after!
The pulse generator itself is maintenance-free.
11.4
Safety precautions
Due to the very short ignition pulses (< 1 µsec), the pulse voltage is not dangerous. However,
unexpected "electrification" can cause alarm. Therefore, wear suitable protective clothing for
welding (in the Federal Republic of Germany, to UVV/VBG 15). Use only well-insulated welding
torches and electrode holders. Perform work on welding torches and replace the electrode only
when the current source is switched off.
