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4-2. 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 providing the protection level at
the load. Upon detection of an Over Voltage condition, the power supply output will shut down.
4-2-1. 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 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.
Table 5-1: Maximum OVP setting levels
Model (V)
Max. OVP (V)
Model (V)
Max. OVP (V)
6
7.5
60
66.0
8
10.0
80
88.0
12.5
15.0
100
110.0
20
24.0
150
165.0
30
36.0
300
330.0
40
44.0
600
660.
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.
4-2-2. Activated OVP protection indications
When the OVP is activated the power supply output shuts down. The VOLTAGE display shows "OUP" and the
ALARM LED blinks.
4-2-3. 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 OUTPUT 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. In this method the power supply
should be set to Auto-Restart mode.
◆
Refer to
"4-6. Output shut-off (SO) control via rear panel J1 connector"
.
3.4 Send OUT 1 command via the RS232/485 communication port.
4-3. Under voltage limit (UVL)
The UVL prevents adjustment of the output voltage below a certain limit. The combination of UVL and OVP functions,
allow the user to create a protection window for sensitive load circuitry.
4-3-1. Setting the UVL level
Setting the UVL can be made when the power supply output is Enabled (On) or Disabled (Off). To set the UVL level,
press the OVP/UVL button TWICE, so that the CURRENT meter shows “UUL”. The VOLTAGE meter shows the UVL
setting level. Rotate the VOLTAGE encoder knob to adjust the UVL level. The display will show
“UUL” and the
setting value for 5 seconds after the adjustment has been completed and then will return to it’s previous state. UVL
setting values are limited at the maximum level to approximately 5% below the Output Voltage setting. Attempting to
adjust the UVL above this limit will result in no response to the adjustment attempt. The minimum UVL setting is zero.
Содержание PU100-15
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