ESAB Precision Plasmarc EPP-600, Инструкция по эксплуатации, Страница: 67 / 90

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sectIon 6 trouBleshootIng
6.9 current control pot and remote Vref
A Reference Voltage, Vref, is used to command the output current of the EPP-600. 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-L (+) and J1-J (-). The EPP-600 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 EPP-600 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 EPP-600 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.
EPP