KEPCO KLP Series (older -1200 models) Operator Manual - Manual (Page 44)

3-4
KLP073008
3.2.4 CHECKING VOLTAGE/CURRENT SETPOINTS
CAUTION: WHEN THE OUTPUT IS DISABLED, THE DC VOLTS AND DC AMPERES DIS-
PLAYS SHOW THE ACTUAL OUTPUT VOLTAGE AND CURRENT. BEFORE
ENABLING THE OUTPUT ALWAYS CHECK THE SETPOINTS TO AVOID POS-
SIBLE DAMAGE TO THE LOAD.
Check the voltage and current set points by tapping either the VOLTAGE or CURRENT control.
The status display reads SET, and the DC VOLTS and DC AMPERES displays show the stored
setpoints.
To accept the displayed value, tap the associated adjustment control again. To change the
value, rotate the control (press the control in while rotating for fine adjustment), then tap the
adjustment control again to accept the new setting.
NOTE: Before changing the setpoint, note the displayed setpoint. If you decide not to change
the value after rotating the control, you must rotate the control to the value noted, then
tap the adjustment control to accept.
3.2.5 DEFINING A VIRTUAL MODEL
The virtual model is defined by establishing a maximum programmable voltage and current for
the unit within the 1200W power limitation and the maximum voltage and current ratings listed in
Table 1-1. Once established, the unit will not accept programmed values beyond these values
whether from the front panel in local mode, or from the digital (GPIB, or RS232) or analog input
ports in remote mode. The virtual model settings are password-protected (see PAR. 4.5).
NOTE: Decreasing full scale voltage and/or current does not improve programming resolution.
A multitude of possible 1200W power supplies may be emulated by defining the maximum volt-
age and current. For example, some of the possible power supplies that a KLP 36-48-1200 can
emulate are: 36V, 33A (1200W), 25V, 48A (1200W), 30V, 40A (1200W), 35V, 30A (1050W).
Refer to Table 1-1 and Figure 1-2 for the acceptable operating regions for each model. Units
without the -1200 suffix can be also be configured to reject programming values that exceed
user-defined limits, however the maximum output power of 1200 Watts can only be achieved at
the rated maximum values of voltage and current.
Whenever a virtual model is set, overvoltage and overcurrent protect limits (see PAR. 3.2.7) are
reset to 120% of the new maximum value. Also, if position 3 of the Analog I/O DIP switch is set
to recall previous setpoint values upon power-up (see Table 2-2 and PAR. 3.2.6.3), the previous
setpoint value is cleared so that the initial powerup after changing the virtual model will be at 0V,
minimum A. In addition, the following parameters should be checked to ensure that there are no
settings outside the range permitted by the new maximum programmable voltage and current:
• User-programmed sequences (see PAR. 3.3.1.1)
• Storage of User-programmed Active Settings (see PAR. 3.3.1.1)
• User-determined output Sequences (see PAR. 3.3.1.2)
• External Triggers: VOLT:TRIG and CURR:TRIG values (see PAR. 3.3.1.3).
• Sequences programmed using LIST commands.