54
83503001 Rev G
5. LOCAL OPERATION
5.1.
Introduction
This Chapter describes the operating modes that are not involved in programming and
monitoring the power supply via its serial communication port (RS232/RS485) or by remote
analog signals. Ensure that the REM/LOC LED on the front panel is Off, indicating Local
mode. If the REM/LOC LED is On, press the front panel REM/LOC button to change the
operating mode to Local.
For information regarding Remote Analog Programming, refer to Chapter 6.
For information regarding usage of the Serial Communication Port, refer to Chapter 7.
5.2.
Standard Operation
The power supply has two basic operating modes: Constant Voltage Mode and Constant
Current Mode. The mode in which the power supply operates at any given time depends
on the Output Voltage setting, Output Current setting and the load resistance.
5.2.1. Constant Voltage Mode
a) In constant voltage mode, the power supply regulates the Output Voltage at the
selected value, while the load current varies as required by the load.
b) While the power supply operates in constant voltage mode, the VOLTAGE LED on
the front panel illuminates.
c) Adjustment of the Output Voltage can be made when the power supply output is
enabled (Output On) or disabled (Output Off). When the output is enabled, simply
rotate the VOLTAGE encoder knob to program the output voltage. When the output
is disabled, press the PREV button and then rotate the VOLTAGE encoder knob.
The VOLTAGE meter will show the programmed Output Voltage for 5 seconds after
the adjustment has been completed. Then the VOLTAGE meter will display “OFF”.
d) Adjustment resolution can be set to coarse or fine resolution. Press the FINE button
to select between the lower and higher resolution. The FINE LED turns On when
the resolution is set to FINE.
NOTE
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 Output Current setting.
NOTE
The maximum and minimum setting values of the output voltage are limited by
the Over Voltage protection and Under Voltage limit setting. Refer to Section 5.3
and 5.4 for more details.