Version November 2015
6
EN
HÜRNER HCU 300 mini 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
2.5 Opening the Unit
Caution
The cover of the product may be removed only by special-
ized staff of the manufacturer or of a service shop properly
trained and approved by it.
2.6 Extension Cables on the Worksite
To extend power cord length, use exclusively properly approved exten-
sion cables that are labeled as such and have the following conductor
sections:
up to 20 m: 1.5 mm² (2.5 mm² recommended); Type H07RN-F
over 20 m:
2.5 mm² (4.0 mm² recommended); Type H07RN-F
Caution
When using the extension cable, it has always to be rolled
off completely and lie fully extended.
2.7 Checking the Product for Damage
Before every use of the product, check safety features and possibly
existing parts with minor damage for proper function. Make sure that
the push-on connection terminals work properly, that contact is fully
established, and that the contact surfaces are clean. All parts have to
be installed correctly and properly conform to all conditions in order
for the product to function as intended. Damaged safety features or
functional parts should be properly repaired or replaced by an ap-
proved service shop.
2.8 Data Interface Cover Cap
The dust cap for the interface has to cover the port during operation,
in order to keep humidity and contaminations away.
2.9 Power Supply Specifications
2.9.1 Mains Power Supply
Utility suppliers’ wiring requirements, occupational safety rules, ap-
plicable standards, and national codes have to be respected.
Caution
When using power distributions on the worksite, rules for the
installation of earth-leakage circuit breakers (RCD) have to
be respected, and operation requires an installed breaker.
Generator or mains power fuse protection should be 16 A (slow blow).
The product has to be protected against rain and humidity.
2.9.2 Generator Power Supply
The required nominal generator capacity as determined by the power
supply requirement of the largest fitting to be welded depends on
the power supply specifications, the environment conditions, and the
generator type itself including its control/regulation characteristics.
Nominal output power of a generator 1-phase, 220 - 240 V, 50/60 Hz:
d 20 ....... d 160
3.2 kW
d 160 ...... d 180
4 kW mechanically regulated
5 kW electronically regulated
Start the generator first, then connect the welding unit. The idle volt-
age should be set to approx. 240 volts. When turning the generator
off, disconnect the welding unit first.
Important
The working output power of the generator decreases by
about 10% per 1,000 m of altitude. During the welding pro-
