Installation; System Presentation; General - Selco ETG 402 Manuel D'instructions

2.4 Installation

Connection for MMA welding
The connection shown in the figure produces
reverse polarity welding. To obtain straight polarity
welding, reserve the connection.
- Connect (1) the earth clamp to the negative socket (-) (2) of
the power source.
- Connect (3) the electrode holder to the positive socket (+) (4)
of the power source.
Connection for TIG welding
- Connect (1) the earth clamp to the positive socket (+) (2)
ofthe power source.
- Connect the TIG torch coupling (3) to the torch socket (-) (4)
ofthe power source.
- Separately connect the torch gas hose connector (5) to the
gas main.
The protection gas flow can be adjusted using
the tap (6) normally found on the torch.
Connection for deseaming ARC-AIR
- Connect (1) the earth clamp to the negative socket (-) (2) of
the power source.
- Connect (3) the ARC-AIR holder to the positive socket (+) (4)
of the power source.
- Connect separately the connector on the air (5) pipe to the air
supply.

3 SYSTEM PRESENTATION

3.1 General

The ETG series rectifiers for coated electrode welding are power
sources with drooping characteristic with electronic adjustment
by means of thyristors. This system gives you a continuous con-
trol of the current, also during welding.
A special electronic circuit allows you to obtain a stable output
current by compensating for any variations in the mains supply
current.
All the ETG rectifiers are designed to perform the following
welding procedures:
- MMA
- TIG LIFT
- ARC AIR
and are provided with a series of functions for MMA welding:
- HOT START
- ARC FORCE
- ANTISTICKING
COMPRESSED
AIR
23