Weld334m - User’s manual
6
•
The lead run through by current is to be placed in the middle of the thoroid.
•
The sensor is to be placed as far as possible away from any edges or elbows of the
secondary lead.
•
As for the turn formed by the secondary circuit, it is necessary to mount the sensor
in a position so that the distance between the go and return conductor be the
maximum possible one.
As for the sensor connections, the following requirements are to be adhered to:
•
The connection cable is to be tightly twisted and screened and is to be run as short
as possible. In any case, its laying is to be done as far as possible away from sources
of electrical or magnetic disturbances and it must not be run in parallel with the cable
for welding component (primary + secondary).
•
The cable screen must be bonded on only one side of the welding control, whereas
no sensor end is to be bonded.
•
Accurately avoid joints or provisional connections between the sensor and the
connector of the welding control in order to minimise any inductive and capacitive
effects. If possible, minimise the quantity of interruptions (terminal boards and/or
plugs).
•
Do not use fuses on the current sensor conductors.
The rules cited above are to be observed by all users carrying out installations and wiring
as well as by those who design and manufacture electric switchboards in cabinets,
transformers and other equipment which are someway associated or associable to current
sensors. The non-observance of these rules entails loss of accuracy and repeatability in the
welding process with constant current control device. In addition, this could cause serious
malfunctioning.
•
It is recommended to use current sensors featuring 150 mV/kA /1k
Ω
sensitivity
and with a 20-25 Ω
internal resistor (these can be ordered from GF WELDING S.p.A.)
•
The Weld334m permits using up to 6 sensors in series (one at a time is active when
welding). The quantity of sensors connected is to be set on the welding device (see
Programming manual, Setup chapter).
1.2.4
Power supply
Depending on the configurations, the Weld334m input can be both direct current and
alternated current (See operating characteristics).
One assumes that power supplied to the system is «clean», meaning it is free from
electrical disturbances and showing no voltage drops.
In case of AC, it is recommended to use a power/insulation transformer with earthed
electrostatic shielding.
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