Weld334m - User’s manual
7
1.2.5
Phase synchronising for welding
To have correct welding operation, the device is to be synchronised with the same power
phase as the SCRs it is piloting.
Considering the power supply features of the device, synchronising may take place in a
different manner, depending on the following cases:
•
If powered from the Ac mains, it is sufficient for the transformer powering the device
to be connected with the same power phase as SCRs.
•
If powered from a power line other than that of SCRs or DC powered, the sync. signal
must be taken from the power side through an insulation transformer. For the use of
the external synchronism, see paragraph 3.4
The non-observance of these rules will cause
serious malfunctioning.
1.2.6
Programming unit
Great care is to be paid to the switching on and off of the HCM 4300 HHT graphic
programming unit.
The input port can be damaged both because of a short circuit during the connection work
and further to electrostatic charges. Put the HHT metal casing in touch with that of the
Weld334m before installing the connector. This will discharge the static charge.
Make sure no foreign bodies, such as metal chips or slags, fall inside the connector.
Any damage to the HCM 4300 HHT graphic programming unit and to the Weld334m,
resulting from tampering or deliberate disregard, will void the guarantee.
1.2.7
Connecting the Weld334m with the WMS central network
To centralise the welding zones, GF WELDING has developed a program called WMS
(Welding Management System). All control devices installed in a given welding zone can be
accessed directly through a serial line linked to a PC.
The program permits interacting with all control devices and, at the same time, controlling
the whole welding process of the zone concerned.
Communication is performed through: the WMSNet associated to an RS485 multidrop
network, or PROFIBUS FMS or ETHERNET TCP/IP.
The serial port of the device has been designed to operate in industrial environment where
a number of pulse and electric disturbances are present. To protect the input stages, these
are fitted with disturbance suppression circuits, whereas the output stages provide signals
ensuring nearly disturbance free level.
For the application of the welding control devices in the WMSNet, PROFIBUS FMS or
ETHERNET TCP/IP centralising network, refer to the relevant specifications.
While implementing the line, a few practical requirements are to be observed by the user.
•
Avoid long common paths of line cables with power cables. Do not forget this
warning specially when planning the lines and the network.
•
Limit the network cable length to the minimum required. (Respect the RS485,
PROFIBUS or ETHERNET requirements for length).
In addition, the best results are achieved if the following is taken into consideration:
•
Terminate the line as specified in the installation manual of the network card.
•
Connect all controls with the network interface card (daisy connection) so to have
only one line of transmission.
•
The cable is to comply with the relevant RS485, Profibus or Ethernet specifications.
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