KEPCO KLR Series User Manual - Manual (Page 48)

3-8
KLR091313
To define a limit model, proceed as follows.
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 once so that the status dis-
play reads LMT. The DC VOLTS and DC AMPERES displays show the programmed maxi-
mum voltage and current of the limit model. To exit without changing the limit model, rotate
either VOLTAGE or CURRENT control until Status display reads EXIT, then tap DC OUT-
PUT switch. To change the limit model limits proceed to step 3.
3. Tap the DC OUTPUT switch once. The status display shows PASS. Enter the unit password
(see PAR. 3.2.8) and tap DC OUTPUT switch to accept the number. When the password is
accepted, the limit model settings in the DC VOLTS and DC AMPERES displays begin blink-
ing.
4. Rotate VOLTAGE and CURRENT controls until desired values appear in DC VOLTS and
DC AMPERES displays. Tap the associated control to change digits. Pressing and holding
the control in while turning changes adjustment resolution (see PAR. 3.2.4). Under no condi-
tions will the power supply accept limits beyond its maximum ratings of voltage and current.
5. Press DC OUTPUT switch to accept limit model settings. The unit displays done.
NOTE: Accepting a new limit model resets the setpoints to zero Volts and minimum Amperes,
resets the OVP and OCP values and, if DIP switch position 3 is enabled, clears stored
setpoints of voltage and current as described above.
3.2.10 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
3.2.10.1) or Setpoint adjustment (PAR. 3.2.10.2).
3.2.10.1 REAL-TIME VOLTAGE/CURRENT ADJUSTMENT
Rotating the associated control will change the output voltage or current in real-time only if the
output is enabled. If the unit is in constant voltage mode (CV indicator lit) the DC VOLTS display
shows the actual output voltage as the VOLTAGE control is rotated. Similarly, if the unit is in
constant current mode (CC indicator lit) the DC AMPERES display shows the actual output cur-
rent as the CURRENT control is rotated.
NOTE: If the unit is in CV mode, rotating the CURRENT control will affect the current limit even
though the DC AMPERES display does not change since it is showing actual output
current. Similarly, rotating the VOLTAGE control while in CC mode affects the voltage
limit. To change the limits to a precise value, refer to PAR. 3.2.10.2, Setpoint Adjust-
ment.