WTC Technitron T2050 - Re-calibrating the T2050; Primary Current Control Setup

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Before shipment, your T2050 control was tested and calibrated by
Technitron. It was calibrated on a 480 V line, welding at values
near 140 primary and 13,000 secondary A. Voltage and currents
were calibrated to the values at the time of the final test. Primary
current was calibrated on 1 kA. maximum range; secondary
current, on 20 kA. maximum range.
These three calibration values are stored in non-volatile memory.
Therefore, re-calibration is not necessary. Re-calibration of
current is necessary ONLY if making a change to the current
range. Re-calibration may be (but normally is not) necessary if
the firmware is changed (U7 PROM) or if the current transformer
(CT) or toroid coil is replaced.
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Primary current control is "turned on" by programming a
transformer Turns Ratio of 1 or higher. You must have a current
transformer (CT) with a 0.2 ohm burden resistor across its
terminals connected to TS4. Technitron normally installs the CT.
The primary current range control is by "W" jumpers W1 – W4,
where
W4 on = 200 A. max @ 99% AVC Mode
W3 on = 1,000 A. max @ 99% AVC Mode (normal)
W2 on = 2,000 A. max @ 99% AVC Mode
W1 on = 3,000 A. max @ 99% VAC Mode
If the Turns Ratio readout is 1, the control will be in primary A. If
the number is above 1, the readout will be primary A. multiplied
by the transformer Turns Ratio entered (secondary).The
maximums listed above are the values before transformer turns
multiplication.