KEPCO EL Series Electronic Load Operator Manual P/N 243-1295 Firmware Version 4.00 to 4.xx - Manual (Page 38)

3-2
SERIES EL 071414
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 ON/OFF switch to ON. All fans turn on, then turn off after 10
seconds except for the right rear fan. The unit performs power-up testing which should take
about 30 seconds to complete. If power-up testing is successful, 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
• (EVHI) appearing in the VOLTS display indicates the established voltage limits
were exceeded at the remote sense point.
• (EVLO) appearing in the VOLTS display indicates the UUT voltage (at the
remote sense point) dropped below the internally set low voltage limit.
• (ECUR):appearing in the CURR display indicates the UUT current has
exceeded the current protect setting. The default current protect setting is 105% of rated
current.
• (EPWR) appearing in the PWR display indicates the UUT power has
exceeded the power protection point. The default power protection setting is 101% of
rated power.
• (EHOT) appearing in the PWR display indicates that the temperature of one
or more of the power dissipating Power MOSFETs 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.)