National Instruments RMX-4120 User Manual page 105

Figure 4-3. Load Connections for Parallel Operation
Master unit
Slave unit 1
Slave unit 2
Complete the following steps to connect the load for parallel operation.
1. Turn off all the RMX programmable power supplies that you want to connect in parallel.
2. Remove the OUTPUT terminal covers.
3. Connect the load cables to the output terminals of the master unit and the slave units.
4. Connect the load cables of the master unit and slave units to the load through a relay
terminal block.
Use load cables that have sufficient current capacity. Use load cables of equivalent length
and cross-sectional area to connect each power supply to the relay terminal block, and wire
the cables so that they are as short as possible (50 cm or less). Also, make the connection
from the relay terminal block to the load block as short as possible.
Wire the J1 connector signal cables and the load cables as far apart as possible.
5. Connect the output terminals (positive or negative) of the master unit and the slave units to
the chassis terminals.
Connect the same polarity output terminals on the master unit and slave units. If you are
using the units under floating conditions, do not connect the terminals.
6. Attach the OUTPUT terminal covers.
If you have a third and fourth slave unit, connect them in the same manner.
Output terminal
Chassis terminal
Output terminal
Chassis terminal
Output terminal
Chassis terminal
RMX Programmable Power Supplies User Manual
Relay terminal
block
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Load