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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 illuminates when the adjustment resolution is set to FINE.
5.2.3
Automatic Crossover
If the power supply operates in Constant-Voltage mode, while the load current is increased to greater than the
Output current limit setting, the power supply will automatically switch to Constant-Current mode. If the load is
decreased to less than the Output current limit setting, the power supply will automatically switch back to
Constant-Voltage mode.
5.3 OVER-VOLTAGE PROTECTION (OVP)
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 provides the protection
level at the load. Upon detection of an Over-Voltage condition, the power supply output will shut down.
5.3.1
Setting the OVP level
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 displays "OUP". The VOLTAGE meter will display the
OVP setting level. Rotate the VOLTAGE encoder knob to adjust the OVP level. The CURRENT meter will show
"OUP" and the OVP setting value for 5 seconds after the adjustment has been completed, and will then return to
its previous operating state.
The minimum OVP setting level is approximately 105% of the
set Output voltage, or the value in Table 7-6, whichever is
higher. The maximum OVP setting level is shown in Table 5-1.
To preview the OVP setting, press the OVP/UVL button so that
the CURRENT meter displays "OUP". At this time, the
VOLTAGE meter will display the OVP setting. After 5 seconds,
the front panel display will return to its previous state.
5.3.2
Activated OVP protection indications
When the Output OVP is activated the power supply output shuts down. The VOLTAGE meter displays "OUP"
and the ALARM LED blinks.
5.3.3
Resetting the OVP circuit
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 are connected properly.
3. There are four methods to reset the OVP circuit.
3.1 Press the 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.
3.4 Turn the power supply output OFF and then ON using the SO control (refer to Section 5.7). In this
method the power supply should be set to Auto-Restart (AUTO) mode.
3.4 Send an "OUT1" command via the RS-232/RS-485 serial communication port.
5.4 UNDER VOLTAGE LIMIT (UVL)
The Output UVL prevents adjustment of the Output Voltage below a user-set limit. The combination of Output
UVL and OVP functions allow the user to create a protection window for sensitive load circuitry.
5.4.1
Setting the Output UVL level
Setting the Output UVL can be made when the power supply output is Enabled (ON) or Disabled (OFF). To set
the Output UVL level, press the OVP/UVL button TWICE so that the CURRENT meter displays "UUL". The
VOLTAGE meter will also display the UVL setting level. Rotate the VOLTAGE encoder knob to adjust the
Output UVL level. The CURRENT meter will display 'UUL" and the UVL setting value for 5 seconds after the
adjustment has been completed and will then return to its previous operating state. Output UVL setting values
are limited at the maximum level to approximately 95% of the Output voltage setting. Attempting to adjust the
Output UVL above this limit will result in no response to the adjustment attempt. The minimum Output UVL
setting is zero.
Model
10V
16V
20V
30V
40V
Table 5-1: Maximum OVP setting levels
44
83-517-000 Rev. A
Max.
Model
OVP
8V
10.0V
12.0V
19.0V
100V
24.0V
150V
36.0V
300V
44.0V
600V
Max.
OVP
60V
66.0V
80V
88.0V
110.0V
165.0V
330.0V
660.0V
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