KEPCO KLR Series User Manual - Manual (Page 47)

KLR091313
3-7
3.2.7 CHECKING VOLTAGE/CURRENT SETPOINTS
CAUTION: BEFORE ENABLING THE OUTPUT ALWAYS CHECK THE SETPOINTS TO
AVOID POSSIBLE 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 (see PAR. 3.2.4 to set coarse/fine preference), then tap the adjustment
control again to accept the new setting. If you decide not to change the value after rotating the
control, the previous setpoint value will be restored after about 20 seconds of inactivity, then tap
either adjustment control to accept. If a fault has been configured for AUTO recovery, the status
display flashes >AUTO for one second upon leaving Setpoint mode (see PAR 3.2.17.3.2).
3.2.8 PASSWORD PROTECTED FUNCTIONS
Certain functions, such as system configuration and calibration, can only be changed from the
front panel after entering the unit password. Refer to PAR. 4 to change the password. Table 4-1
shows the factory default password for each model.
1. The status display shows PASS (password) and the display shows 0000 with the left-most
character blinking. Rotate CURRENT control to select a number from 0-9. Tap CURRENT
control to advance to next digit.
2. Repeat this process until all four digits have been selected. Tap DC OUTPUT switch to
accept the number. If password is incorrect, the status display reads “ERR”. Repeat this step
to enter the correct password, or press the FUNCTION switch to exit.
3.2.9 DEFINING A LIMIT MODEL
The limit model is defined by establishing a maximum programmable voltage and current for the
unit within the maximum voltage and current ratings listed in Table 1-2. 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, RS 232, or LAN) or analog input ports in remote mode.
NOTE: Decreasing full scale voltage and/or current does not improve programming resolution.
Whenever a limit model is set, overvoltage and overcurrent protect limits (see PAR. 3.2.11) are
reset to 120% of the new maximum value (except where necessary to maintain minimum values
as noted in PAR. 3.2.11). 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. 3.2.10.3), the previous setpoint value is
cleared so that after changing the limit model the initial powerup will be at 0 Volts, minimum cur-
rent. In addition, the following parameters which are not accessible from the front panel (see
PAR. 3.3.2) should be checked to ensure that there are no settings outside the range permitted
by the new maximum programmable voltage and current.
• Storage of User-programmed Active Settings (Save/Recall).
• User-determined output Sequences.
• External Triggers: VOLT:TRIG and CURR:TRIG values
• Sequences programmed using LIST commands.