KEPCO EL Series Electronic Load Operator Manual P/N 243-1295 Firmware Version 3.12 (Unit Rev 2) - Manual (Page 39)

SERIES EL 070110
3-5
• 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.
3.8.5 MASTER/SLAVE CONTROLS AND INDICATORS
Controls and indicators function as described for a single unit, however controls are only active
on the Master Load. Indicators on the Master Load are for Master/Slave configuration. Indica-
tors on the Slave indicate individual Slave Load current and power and Slave status (VOLTS
display reads SLAU). Slave LOAD switch indicators show engaged (amber) or disengaged
(green) status of each slave. Fault indications are displayed on each slave, as well as the mas-
ter.
3.8.6 MASTER/SLAVE OPERATING NOTES/CAUTIONS/WARNINGS
Be sure to read and follow the operating instructions described for a single unit and observe all
Cautions and Warnings. A Master/Slave Load configuration is capable of extremely high power
and extremely high currents, thus suitable precautions should be taken when using the Load.
• Use optimal damping (see PAR. 3.11 for setup instructions to optimize damping set-
tings), otherwise use factory default settings.
• Interconnect UUT and Load with cabling designed to minimize inductance. Remember
that rapidly-changing high-currents combined with inductance produces high-voltage
spikes (spikes that can easily damage equipment including the EL Load).
• To minimize spiking and current surges when using computer-controlled remote opera-
tion, the best sequence is:
1. Select Mode (e.g. MODE CURR).
2. Select very low value set point (e.g. CURR 0.2).
3. Engage Load (INPUT ON).
4. Slew Load to desired operating set point (e.g. CURR 105).
3.8.7 MASTER/SLAVE DISCONNECT
Once units have been operated in a Master/Slave configuration, they must be reconfigured to
restore normal standalone operation. This may be accomplished either from the front panel, or
via a computer interface.
From front panel: Turn power off to all units, then remove all master/slave cables. Power up all
units, wait two minutes, then turn power off and then back on to all units.
From computer interface: At master unit send cal:slavemode 0. After three seconds, send
*RST. Disconnect all master/slave cables and then either send *RST to each unit or cycle power
to each unit off and then back on.