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83
-
5
15
-
0
00
Rev.
B
36
-
Enabled output, power supply in Constant Voltage mode: Press the PREV button and then r
o-
tate the CURRENT encoder knob. The C
URRENT meter will show the programmed Output
Current for 5 seconds after the adjustment has been completed, and then will return to show
the a
c
tual load current.
-
Enabled output, power supply in Constant Current mode: Rotate the CURRENT encoder
knob to adj
ust the Output Current.
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.
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 will automatically switch to Constant Cu
r
rent mode. If
the load is decreased to less than the current limit setting, t
he 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 volt
age 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 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 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 settin
g 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
higher. 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 CU
RRENT display will show “OUP”. At this
time, the VOLTAGE display will show the OVP setting. A
f-
ter 5 seconds, the display will return to its previous state.
Table 5
-
1: Maximum OVP s
etting levels
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
Resetting the OVP circuit
To reset the OVP circuit after it activates:
1.
Reduce the pow
er 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 switc
h, 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 Section 5.7).
In this method the power supply should be set to Auto
-
Restart mode.
3.4
Send an OUT 1command via the RS232/RS485 communication port.
Model
Max.
OVP
Model
Max.
OVP
8V
10V
1
6
V
20V
30V
40V
10.0V
12.0V
1
9.0
V
24.0V
36.0V
44.0V
60V
80V
100V
150V
300V
600V
66.0V
88.0V
110.0V
165.0V
33
0.0V
660.0V