83-517-000 Rev.
A
43
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 (RS-232/R-S485) 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 limit setting and the load resistance.
Constant-Voltage Mode
5.2.1
1. 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.
2. While the power supply operates in Constant-Voltage mode, the
VOLTAGE LED
on the front panel stays
illuminated.
3. 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
iew 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
”.
4. 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
illuminates when the adjustment resolution is set to
FINE
.
Constant-Current Mode
5.2.2
1. In Constant-Current mode, the power supply regulates the Output current at the selected value, while the
load voltage varies with the load requirement.
2. While the power supply is operating in Constant-Current mode, the
CURRENT LED
on the front panel stays
illuminated.
3. Adjustment of the Output current limit can be made when the power supply output is Enabled (Output ON) or
Disabled (Output OFF).
-
Disabled output (OFF):
Press the
PREV
iew button and then rotate the
CURRENT
encoder knob.
The
CURRENT
meter will show the programmed current limit for 5 seconds after the adjustment
has been completed. Then the
VOLTAGE
meter will display “
OFF
”.
-
Enabled output, power supply in Constant-Voltage mode (ON):
Press the
PREV
iew button
and then rotate the
CURRENT
encoder knob. The
CURRENT
meter will display the programmed
current limit for 5 seconds after the adjustment has been completed, and then will return to display
the actual load current.
-
Enabled output, power supply in Constant-Current mode (ON):
Rotate the
CURRENT
encoder
knob to adjust the Output current limit.
NOTE
If after completing the adjustment, the display shows a different value than
the setting, the power supply may be at the Output current limit setting.
Check the load condition and the power supply Output current limit setting.
NOTE
The maximum and minimum setting values of the Output voltage are limited
by the Over-Voltage-Protection and Under-Voltage-Limit settings.
Refer to Sections 5.3 and 5.4 for more details.
