KEPCO EL Series Electronic Load Operator Manual P/N 243-1295 Firmware Version 3.87 to 3.xx - Manual (Page 42)

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SERIES EL 022013
3.11 OPERATION OF MASTER/SLAVE CONFIGURATIONS.
Up to 15 Series EL Electronic Loads may be paralleled for additional current handling capability.
All units must have the same voltage rating. One load is designated as the Master, and the rest
are designated as slaves. Refer to PAR. 2.6.3 for connections.
A Master/Slave combination responds to an *IDN? query with the *IDN string from first the Mas-
ter and then the Slave(s).
3.11.1 POWER UP
Turn on power to all loads connected as Master/Slave. The units will go through power-up and
reset cycles until all slaves are recognized (this may take a few minutes). NOTE: Power-up time
can be reduced by powering up the slaves 10 to 20 seconds before powering up the master.
• The LOAD button on each Slave Load turns green once the Load completes its diagnos-
tic tests.
• The VOLTS display on the Slave(s) reads SLAU (Slave).
• The LOAD button on the Master Load turns green once the Master Load 1) completes its
diagnostic routine, 2) interrogates the Slave(s) for Master-Slave connection eligibility
and ratings, 3) establishes the overall Master-Slave Load configuration.
3.11.2 LOCAL (FRONT PANEL) OPERATION
The Load can be operated from the Master front panel as described in the previous paragraphs
for a single unit. Only the Master Load front panel is active.
3.11.3 REMOTE (COMPUTER) OPERATION
If a computer is connected to the Master Load of a master/slave configuration in terminal display
mode, the information shown in Figure 3-2 is displayed at startup (boot).The Master-Slave con-
figuration responds to the SCPI command set described in Appendix A and B.
3.11.4 INDICATIONS DURING MASTER/SLAVE OPERATION
The Master Load displays:
• AMPS: Total Current drawn by the Master/Slave configuration
• VOLTS: Voltage applied to each of the Loads
• KW: Total power in kW drawn by the Master/Slave configuration
Slave Load(s) display:
• AMPS: Current drawn by the individual Slave
• VOLTS: reads SLAU showing unit is a slave connected to Master.
• KW: Power in kW drawn by the individual Slave.