Vogt Tube-Ice HFO10, Руководство по обслуживанию

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A-3
Notes
•
If the SELECT button is pressed and no parameters are changed by pressing the UP or DOWN arrow keys,
the DTP-3 will automatically return to a display showing the line voltage.
•
New settings are saved in permanent memory when the display returns to showing the line voltage.
New settings may be verified by pressing the SELECT button to scroll through the parameters.
•
To prevent tripping on a one (1) volt change, the DTP-3 automatically calculates cut-in voltages for the
return from undervoltage conditions. The cut-out out voltage is always based on user voltage and
tolerance settings, while the cut-in voltage is 3% closer to the nominal voltage setting. This quality is
referred to as hysteresis. This is to help reduce oscillation that may occur on a weak power distribution
system. When the load is switched off due to undervoltage, the line voltage will increase. Without
hysteresis, the monitor would switch the load back on, the line voltage would again drop, and cause
continuous on-off-on cycling.