ESAB ESP-600C Manuel D'instruction page 329

section 6 troubleshootinG
6.9 current control pot and remote vref
The ESP-600C operates through a single continuously adjustable output current range from 50A through 600A using either
the Current Potentiometer, on the front panel, or a remote current reference signal, Vref, fed into connector, J1.
The reference voltage, Vref, is used to command the output current of the ESP-600C. Vref is a DC voltage that can come from
either the Current Control Potentiometer on the front panel or from a remote source. In the "Panel" position, S2, the Panel
/ Remote switch selects the Current Control Potentiometer. In the "Remote" position, the Panel/Remote switch selects the
Vref fed into J1-C (+) and J1-D (-). The ESP-600C Output Current, I (out), will follow Vref with the following relationship:
I(out) = (80) x (Vref)
The Control PC Board contains two inputs for Vref: High Speed; and Normal. When the negative of the Vref signal is fed
into the High Speed input (P8-3), the ESP-600C will respond to a change in Vref within 10 mS. When the negative of the
Vref signal is fed into the Low Speed input (P8-1), the ESP-600C will respond to a change in Vref within 50 mS. The slower
response of the "Normal" input helps filter electrical noise sometimes encountered in industrial environments.
J1-D J1-C
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