34
CHAPTER 5
LOCAL OPERATION
5.1 INTRODUCTION
5.2 STANDARD OPERATION
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.
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.
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
illuminates.
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
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 FINE button to select between the lower and higher resolution. The FINE LED turns On
when the resolution is set to FINE.
5.2.1 Constant Voltage Mode
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 protection and Under Voltage limit setting.
Refer to Sec.5.3 and 5.4 for more details.
NOTE
NOTE
5.2.2 Constant Current Operation
1. In constant current mode, the power supply regulates the output current at the selected value,
while the voltage varies with the load 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 limit 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 current limit for 5 seconds after the adjustment
has been completed. Then the VOLTAGE meter will display "OFF".
35
- Enabled output, power supply in Constant Voltage mode: Press the PREV 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, and then will return to
show the actual load current.
- Enabled output, power supply in Constant Current mode: Rotate the CURRENT encoder
knob to adjust the current limit.
4. Adjustment resolution can be set to Coarse or Fine adjustment. Press the FINE button to
select between the Coarse and Fine resolution. The FINE LED turns On when the resolution
is set to FINE.
If the power supply operates in Constant Voltage mode, while the load current is increased to greater
than the current limit setting, the power supply will automatically switch to Constant Current mode. If
the load is decreased to less than the current limit setting, the power supply will automatically switch
back to Constant Voltage mode.
The OVP circuit protects the load in the event of a remote or local programming error or a power
supply failure. The protection circuit monitors the voltage at the power supply sense points and thus
providing the protection level at the load. Upon detection of an Over Voltage condition, the power
supply output will shut down.
The OVP can be set when the power supply output is Enabled (On) or Disabled (Off). To set the OVP
level, press the OVP/UVL button, so that the CURRENT meter shows "OUP".
The VOLTAGE meter shows the OVP setting level. Rotate the VOLTAGE encoder knob to adjust the
OVP level. The display will show "OUP" and the setting value for 5 seconds after the adjustment has
been completed and then will return to it's previous state.
The minimum setting level is approx. 105% of the set output voltage, or the value in Table 7-6,
whichever is higher. The maximum setting level is shown in Table 5-1.
5.2.3 Automatic Crossover
5.3.1 Setting the OVP level
5.3 OVER VOLTAGE PROTECTION (OVP)
Table 5-1: Maximum OVP setting levels
5.3.2 Activated OVP protection indications
5.3.3 Resetting the OVP circuit
When the OVP is activated the power supply output shuts down. The VOLTAGE display shows
"OUP" and the ALARM LED blinks.
To reset the OVP circuit after it activates:
1. Reduce the power supply Output Voltage setting below the OVP set level.
2. Ensure that the load and the sense wiring is connected properly.
3. There are four methods to reset the OVP circuit.
3.1 Press OUT button.
3.2 Turn the power supply Off using the AC On/Off switch, wait until the front panel display turns
Off, then turn the power supply On using the AC On/Off switch.
3.3 Turn the power supply output Off and then On using the SO control (refer to sect.5.7). In this
method the power supply should be set to Auto-Restart mode.
3.4 Send OUT1 command via the RS232/485 communication port.
60V
80V
100V
150V
300V
600V
66.0V
88.0V
110.0V
165.0V
330.0V
660.0V
Model
Max.
OVP
6V
8V
12.5V
20V
30V
40V
7.5V
10.0V
15.0V
24.0V
36.0V
44.0V
Model
Max.
OVP
To
preview
the
OVP
setting,
press
OVP/UVL
pushbutton so that the CURRENT display will show
"OUP". At this time, the VOLTAGE display will show the
OVP setting. After 5 seconds, the display will return to
it's previous state.
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Summary of Contents for Genesys GENH6-100
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