KEPCO EL Series Electronic Load Operator Manual P/N 243-1295 Firmware Version 3.12 (Unit Rev 2) - Manual (Page 36)

3-2
SERIES EL 070110
3.3 TURNING THE UNIT ON
1. Connect the load to the UUT (Unit Under Test) (see PAR. 2.6.2)
2. Connect the load to mains power (see PAR. 2.6.1)
3. Connect the load to a computer system
4. Press the front panel POWER switch to ON. The LOAD switch lights green (steady). If it is
illuminated Red a Fault condition exists that must be corrected prior to using the load (see
PAR. 3.3.1).
5. Ensure the computer control system is turned on and communication with the Series EL
Electronic Load is established. Current status of the Series EL Electronic Load modules is
shown by front panel displays.
6. When the unit is first turned on, the LOAD setting and remote computer commands
(INPUT/OUTPUT) are initialized for zero current draw. Setpoints, mode, limits, and other set-
tings remain from prior work. The load is shipped in CI mode and set for 0 Amperes.
7. When first initiating a load, it is advisable to make a “Test run” at a nominal load level (e.g.,
10% of the expected parameter setting). This allows the user to ensure all connections are
properly made and results are as expected when engaging the load.
3.3.1 ERROR CONDITIONS
FALT blinking in the AMPS or KW display indicates the associated parameter (current or power)
exceeded established limits.
• HI: Alternating with a voltage measurement in the VOLTS display indicates the estab-
lished voltage limits were exceeded at the remote sense point. (Note: the voltage
measurement continues to be displayed as long as the UUT is connected.)
• LO: Alternating with a voltage measurement in the VOLTS display indicates the UUT
voltage (at the remote sense point) dropped below the internally set low voltage
limit.
• HOT Indicates that the temperature of one or more of the power dissipating Power MOS-
FETs exceeded safe operating limits. (Note: this may cause either a reduction of
the load maximum current/power handling ability or a complete inability to use the
load depending on the degree of overheating.)
3.4 SELECTING THE MODE AND SETPOINT
To select a mode and setpoint for the controlled parameter (current, power, voltage, resistance
or conductance) prior to drawing current from the UUT, verify that the LOAD pushbutton indica-
tor is green (steady) and proceed as follows:
1. Depress and hold the CONTROL knob for 3 seconds. The LOAD pushbutton indicator goes
from green to off. Rotating the CONTROL knob sequentially selects the operating mode in
the order: CV, CI, CP, CR, CS, SHORT and OFF (see Table 3-1). Release CONTROL to set
mode.