Earthing; Power Supply Via Generating Set; Commissioning; Start-Up - Selco UNISTEP Serie Instrucciones De Uso

Earthing

2.4.3
In order to protect users, the system must be correctly earthed.
The power supply voltage is provided with an earth lead (yellow
- green), which must be connected to a plug provided with
earth contact.
WARNING
* The electrical system must be made by skilled technicians
with the specific professional and technical qualifications
and in compliance with the regulations in force in the
country where the equipment is installed.
* The welding power source supply cable is provided with a
yellow/green wire that must ALWAYS be earthed. This yel-
low/green wire must NEVER be used with other voltage
conductors.
* Verity the existence of the earthing in the used plant and
the good condition of the socket/s
* lnstall only plugs that are homologated according to
the safety regulations.

2.4.4 Power supply via generating set

The system can be powered by a generating set on condition
that it guarantees a stable power supply voltage of ±15% with
respect to the rated voltage value declared by the manufacturer,
in all possible operating conditions and at the maximum power
that can be delivered by the power source.
Normally we recommend using generating sets
with power twice that of the power source if sin-
gle-phase and 1.5 times the power if three-phase.
You are advised to use electronic control genera-
ting sets.

2.5 Commissioning

The earth cable must be connected as near the
area to be welded as possible.
Before welding , check the condition of the electric
cables and of the torch, and if they are damaged
repair or change them.

2.5.1 Start-up

For commissioning of the system, follow the instructions below:
a) Disconnect the power supply from the power source.
b) Open the right-hand side cover.
c) Connect the power cable (1) of the cable bundle to the posi-
tive pole of the terminal block to change polarity (see

"Changing the welding polarity").

d) Connect the signal cable (2) to the connector on the front of
the power source.
e) Tighten the inlet cable grips.
f) Close the right-hand side cover.
2.5.2 Changing the welding polarity
This device permits welding of any welding wire on the market
via easy selection of the welding polarity (direct or inverse).
Direct polarity: the power cable from the cable bundle must be
connected to the negative pole of the terminal block (negative
in torch). The other two terminals must be connected together
with the connection bridge.
Inverse polarity: the power cable from the cable bundle must
be connected to the positive pole of the terminal block (positi-
ve in torch). The other two terminals must be connected toge-
ther with the connection bridge.
To change the polarity, open the right-hand cover, remove the
three fastening screws, select the required polarity as per the
attached diagram, secure the three screws on the terminal block
and close the power source.
Fig.2
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