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83
-
507
-
013 Rev. D
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 Output Current
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 e
n
coder knob to
adjust the Output Current.
4.
Adjustment resolution can be set to Coarse or Fine adjustment. Press the FINE button to select
between the Coarse an
d Fine resolution. The FINE LED turns On when the 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 current limit setting, the power supply wi
ll automatically switch to Constant Cu
r
rent mode. If
the load is decreased to less than the 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 su
p-
ply failure. The protection circuit monitors the voltage at the power supply sense points and thus pr
o-
vides the protection level at the load. Upon detection of an Over Voltage condition, the po
wer 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 shows “OUP”. The VOLTAGE meter
shows the OV
P 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 co
m
pleted, and
then will return to its previous state.
The minimum setting level is approximately 105% of the
set Output Voltage, or the value in Table 7
-
6, whichever is
hi
gher. The maximum setting level is shown in Table 5
-
1.
To preview the OVP setting, press the OVP/UVL pushbu
t-
ton so that the CURRENT display will show “OUP”. At this
time, the VOLTAGE display will show the OVP setting. A
f-
ter 5 seconds, the display will retu
rn to its previous state.
Table 5
-
1: Maximum OVP setting le
v
els
5.3.2
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.
5.3.3
R
esetting 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.
a) Press the OUT button.
b) 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.
c)
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 mode.
d) Send an OUT 1command via the RS232/RS485 communication port.
Model
Max.
OVP
Model
Max.
OVP
6V
8V
12.5V
20V
30V
40V
50V
7.5V
10.0V
15.0V
24.0V
36.0V
44.0V
57.0V
60V
80V
100V
150V
300V
600V
66.0V
88.0V
110.0V
165.0V
330.0V
660.0V