APS 6RL Series, Operation Manual

Page: 196 / 204

DCS SERIES OPERATION MANUAL
SECTION 8: MASTER/SLAVE OPERATION
Entire Contents Copyright

2018 by Adaptive Power Systems, Inc. (APS) • All Rights Reserved • No reproduction without written authorization from APS.
6RL Series Regenerative DC Load Operation Manual Page 196 of 204
8.3.2 Connecting Units to a 2QO Test Systems
There are several ways to connect a source(s) and a sink(s)
to create a 2Quadrant test system:
Configuration A: Load, power supply and one E.U.T.
This is the most common configuration. The nominal values for U,I
and P of the two units should match, such as 6RL03-170-80 and
DCS80-170. The system is controlled by the power supply set to
“Master”mode in the setup menu, even if there are no slave DC
power supplies.
Configuration B: Multiple loads and supplies, one E.U.T.
The combination of load units and power supply units each create
a power block. Here it is also necessary to match the nominal
values, especially the voltage of the two systems, i.e. an 80 Vdc
input of the loads to a max. 80 VDC Input of the power supplies. The
max. number of 16 units cannot be exceeded. Regarding the Share
bus connection, all load units must be slaves, while one of the DC
Supplies has to be set as a master.
8.3.3 2QO Operation Unit Settings
Regarding 2QO operation where the Share bus connection is sufficient, the load unit(s) are
required to set the “Master-slave mode” parameter to SLAVE or OFF (unless part of a M/S
system of loads) in. The option “DCS/ 6RL system” must be activated for the master load of a
possibly configured M/S system of loads.
On any of the power supplies, preferably PSU 1, master-slave mode must be activated (setting
“MASTER”), even if there is only one power supply.
For safety of the connected E.U.T and to prevent damage to it, we recommend to adjust
supervision thresholds like OVP, OCP or OPP on all units to the desired levels, which will then
switch off the DC Input resp. the DC input in case of excessive voltage, current or power.
8.3.4 Restrictions
After all electronic loads have been connected to the Share bus with one power supply as
master, they cannot limit their input voltage anymore to what you adjust as “U set” on the unit.
The correct voltage level comes from the master unit and has to be adjusted there.
8.3.5 Application example
Charging and discharging a battery with 24 V/400 Ah, using configuration A from above.

Power supply DCS80-170-4 3U with: I
Set
= 40 A (charging current, 1/10 of capacity), P
Set
= 5000 W.

Electronic load 6RL03-170-80 set to: I
Set
= max. discharging current of the battery (e.g.
100 A), P
Set
= 3500 W, plus probably UVD = 20 V with event type “Alarm” to stop
discharging at a certain low voltage threshold.

Assumption: battery has a voltage of 26 V at test start.

DC input(s) and DC Input(s) of all units switched off.