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Single-pack controls use a pair of SCRs. Tri-pack controls use
three independent pairs of SCRs on one common base plate. The
unit has internal water cooling to minimize the external water
connections.
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This section describes the Secondary Current Interface Board
(abbreviated to SCIB).
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The Secondary Current Interface Board (SCIB) is an add-on
accessory to WTC’s kernel-based welding controls (i. e.,
MedWeld 3005, 200, etc.). The SCIB enables the welding control
to read secondary current. If the correct software is installed in
the weld timer, the SCIB can be used in any welding control
which fires the SCRs with 645 firing boards. This includes
cascade-firing controls and three-phase controls which use the
Firing Board Multiplexer (FBM).
The Secondary Current Interface Board (SCIB) installs in-line on
the cable which connects between the weld timer and the firing
board. The form factor of the SCIB includes mounting holes
which match those on the 645 firing board. Two connectors
accept cables to connect to the weld timer and the firing board.
The SCIB draws its power from the weld timer. No external
power source is required.
The SCIB uses an air-wound (Rowgowski) current-sensing coil to
measure secondary welding current. This sensing coil connects to
the SCIB via a 2-pin Phoenix connector.
The SCIB can measure AC or DC currents up to 100,000 A. For
AC currents greater than 25% of full-scale, the measurement
uncertainty of the SCIB itself is 1% of reading, plus the
measurement uncertainty of the current-sensing coil. For DC
currents greater than 25% of full-scale, of less than 0.5 sec
duration, the measurement uncertainty of the SCIB itself is 2% of
reading, plus the measurement uncertainty of the current-sensing
coil. Once installed and with self-calibration at recommended
intervals, repeatability of the current reading from the SCIB is
1 %.
Under software control from the weld timer, the SCIB can be
placed into several operating modes. These modes allow various
combinations of primary current, secondary current and power-
line voltage to be measured by the weld timer. The switch
between operating modes can be done at any time when current
is not flowing.
Содержание MedWeld 3005
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