55
83503001 Rev G
5.2.2. Constant Current Mode
a) In constant current mode, the power supply regulates the Output Current at the
selected value, while the voltage varies with the load requirement.
b) While the power supply is operating in constant current mode, the CURRENT LED
on the front panel illuminates.
c) Adjustment of the Output Current setting 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 Output Current limit for
5 seconds after the adjustment has been completed. Then the VOLTAGE meter
will display “OFF”.
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
encoder knob to adjust the Output Current.
d) 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 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.
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 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 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.
Model
Max. OVP
Model
Max. OVP
8V
10V
15V
20V
30V
40V
10.0V
12.0V
18.0V
24.0V
36.0V
44.0V
60V
80V
100V
150V
300V
600V
66.0V
88.0V
110.0V
165.0V
330.0V
660.0V
Table 5-1: Maximum OVP setting levels
