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The wires connected to the firing card connector J3 (1L1 and 1L2
without an isolation contactor, or 1L1, 1L2 and 2L2 with an
isolation contactor) originate across the 380/480/600 VAC supply
voltage. These wires carry the zero-crossing logic signal. This
signal synchronizes the weld processor with the supply.
They also provide the voltage-to-frequency logic signal which the
weld processor card uses to measure line voltage.
The current coil generates a voltage signal which is proportional
to the measured current. This signal enters the firing card via
connector J4. The signal is converted to the current-to-frequency
logic signal, which the weld processor board uses to measure the
welder’s current.
The firing card receives a logic-level firing signal through its J2
connector from the weld processor card. This signal is optically
coupled to a high-voltage circuit on the firing card, and controls
the SCR wired through the firing card connector J1.
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The firing card also outputs a group of logic level signals from the
various connections at the welder’s primary circuit. The weld
processor uses these signals to:
•
Find the zero-degree phase angle point on the supply power
as a reference for its phase-angle measurements
•
Measure the line voltage, current and power factor
•
Adjust the firing phase angle, based on the voltage or current
(depending on the firing mode) and the power factor and
•
Check for shorted or misfiring SCR(s).
All of these signals are transmitted over firing card connector J2
and weld processor card connector J3.
Содержание MedWeld 3005
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