4.4 LOCAL OPERATION
4.4.1 Introduction
4.4.2 Constant Voltage Operation
This paragraph describes the operating modes not involved in programming the power supply via it’s
serial communication port. Operation utilizing the front and rear panel are described in this paragraph.
For information regarding serial port usage, please refer to chapter 5.
The REM LED on the front panel indicates whether the power supply is in Local or Remote mode. The
extinguished LED indicates Local operation. If the LED illuminates, the REM pushbutton (fig.4-1, item
8),should be pressed to change the operating mode to Local.
1. In constant voltage mode, the power supply maintains the output voltage at the selected value while
the load current varies as required by the load.
2. While the power supply is operating at constant voltage, the CV LED on the front panel illuminates.
3. For coarse output voltage adjustment, press V/A consecutively, until the V LED illuminates, and
the VOLTS display shows FA_V. The AMPS display will show the output voltage setting value.
Rotate the ADJUST knob to set the output voltage. At this mode, approx. 6 turns are required to
adjust the entire range. Approx. 3sec after the adjustment, the display returns to show the actual
voltage and current.
3. For coarse output current adjustment, press V/A consecutively, until the A LED illuminates, and
the VOLTS display shows FA_A. The AMPS display will show the output current setting value.
Rotate the ADJUST knob to set the output current. At this mode, approx. 6 turns are required to
adjust the entire range. Approx. 3sec after the adjustment, the display returns to show the actual
voltage and current.
4.4.3 Constant Current Operation
NOTE
NOTE
4. For fine adjustment of output voltage, press V/A consecutively until the V LED illuminates and the
VOLTS display shows SL_V.The AMPS display will show the output voltage setting value. Rotate
the ADJUST knob to set the output voltage. At this mode the adjustment resolution is maximal.
Approx 3sec. after the adjustment, the display returns to show the actual voltage and current.
4. For fine adjustment of output current, press V/A consecutively until the A LED illuminates and the
VOLTS display shows SL_A. The AMPS display will show the output current setting value. Rotate
the ADJUST knob to set the output current. At this mode the adjustment resolution is maximal.
Approx 3sec. after the adjustment, the display returns to show the actual voltage and current.
1. In constant current mode the power supply maintains the output current at the selected value, while
the load voltage varies with the load requirement.
2. While the power supply is operating at constant current, the CC LED on the front panel illuminates.
If after completing the adjustment the display shows a different value than the setting, the power
supply may be at current limit. Check the load condition and the power supply current limit setting.
The maximum and minimum setting values of the output voltage are limited by the over voltage and
under voltage protection settings. Refer to par. 4.4.5 and 4.4.6 for details.
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