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83
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507
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013 Rev. D
34
CHAPTER 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. E
n
sure
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 informat
ion 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 C
urrent
Mode. The mode in which the power supply operates at any given time depends on the Output Vol
t-
age setting, Output Current setting and the load resistance.
5.2.1 Constant Voltage Mode
1.
In constant voltage mode, the power supply regulates the Output V
oltage at the selected value,
while the load current varies as required by the load.
2.
While the power supply operates in constant voltage mode, the VOLTAGE LED on the front panel
illuminates.
3.
Adjustment of the Output Voltage can be made when the power suppl
y 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 VO
LTAGE meter will show the programmed Output
Voltage for 5 seconds after the adjustment has been completed. Then the VOLTAGE meter will
display “OFF”.
4.
Adjustment resolution can be set to coarse or fine resolution. Press FINE button to select b
e
tween
the low
er and higher resolution. The FINE LED turns On when the resolution is set to FINE.
5.2.2 Constant Current Mode
1.
In constant current mode, the power supply regulates the Output Current at the selected value,
while the voltage varies with the loa
d requirement.
2.
While the power supply is operating in constant current mode, the CURRENT LED on the front
panel illuminates.
3.
Adjustment of the Output Current setting can be made when the power supply output is enabled
(Output On) or disabled (Output Off).
-
Disabled output (Off): Press PREV button and then rotate the Current encoder knob. The
CURRENT meter will show the programmed Output Current limit for 5 seconds after the adjus
t-
ment has been completed. Then the VOLTAGE meter will display “OFF”.
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 a
nd 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 se
t
ting.
Refer to Sections 5.3 and 5.4 for more details.