KLP073008
3-5
To define a virtual model, proceed as follows. (To establish a virtual model using SCPI com-
mands, use VOLT:LIM:HIGH (see PAR. B.49) and CURR:LIM:HIGH (see PAR. B.37), respec-
tively.)
1. If the status display shows
SET
, tap either the
CURRENT
or
VOLTAGE
controls to take the
unit out of setpoint mode (status display goes from
SET
to blank)
2. . Using a thin tool (e.g., a paper clip), press the
FUNCTION
switch repeatedly until the status
display reads
VIRT
. The
DC VOLTS
and
DC AMPERES
displays show the programmed
maximum voltage and current of the virtual model. To exit without changing the virtual
model, continue to press
FUNCTION
until Status display is blank. To change the values pro-
ceed to step 3.
3. Press the
DC OUTPUT
switch once. The status display shows
PASS
(password) (see PAR.
4.5) and the Current Display shows
0000
. Rotate
CURRENT
control to select a number from
0-9. Tap
CURRENT
control to advance to next digit. Repeat this process until all four digits
have been selected. Tap
DC OUTPUT
switch to accept the number. When the password is
accepted, the status display reads VIRT; proceed to step 4.
4. Rotate
VOLTAGE
and
CURRENT
controls until desired values appear in
DC VOLTS
and
DC AMPERES
displays. Pressing and holding the control in while turning provides a finer
adjustment resolution. Under no conditions will the power supply accept limits beyond its
maximum ratings of voltage and current. For models with -1200 suffix, as the primary param-
eter is increased, the power supply will automatically decrement the secondary parameter as
necessary to maintain maximum output power at 1200 Watts. Maximum current shown on
DC AMPERES
display is automatically limited to 1200W maximum.
5. Press
DC OUTPUT
switch to accept virtual model settings. The unit displays
done
, then
resets and repeats the power on sequence, showing the new virtual model parameters while
the status display flashes
VIRT
. Then the default protection limits (based on selected virtual
model settings) are displayed while the status display shows PROT. Last, the unit is placed
in setpoint mode with the voltage and current displays reset to 0 volts, minimum amps.
NOTE: Accepting a new virtual model resets the setpoints to zero Volts and minimum
Amperes (see NOTE, PAR. 3.2.1) and resets the OVP and OCP values to 120% of vir-
tual model maximum. If DIP switch position 3 is enabled, stored values of voltage and
current are cleared when the virtual model settings are saved.
3.2.6
SETTING VOLTAGE OR CURRENT
The
VOLTAGE
and
CURRENT
controls adjust output voltage and current limit, respectively,
when the unit is in constant voltage (CV) mode and adjust voltage limit and output current,
respectively, when the unit is in constant current (CC) mode. The mode (CV or CC) is deter-
mined by the load together with the programmed settings. As long as the voltage across the
load produces a current that is less than the programmed Current setpoint, the unit operates in
CV mode (voltage programmed to voltage setpoint, current limited by current setpoint). If the
load changes to the point that current through the load reaches the current setpoint, the unit
automatically enters CC mode (current programmed to current setpoint, voltage limited by volt-
age setpoint).
Output voltage or current can be set at the front panel in two ways: Real-time adjustment (PAR
3.2.6.1) or Setpoint adjustment (PAR. 3.2.6.2).
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