When RMX programmable power supplies are shipped from the factory, the connector is attached to the sensing terminals. RMX programmable power supplies are supplied with a connector cover that fits over the entire sensing, J1, and J2 connectors. For safety reasons, be sure to attach the connector cover when you use the RMX programmable power supply. If they are damaged or lost, contact NI.

Figure 17. Connector Cover
Figure 18. Terminal Connector
Caution Risk of electric shock and damage to internal circuits.

Never wire the sensing terminals while the POWER switch is turned on.

Use sensing cables that provide reinforced or double insulation with a capacity greater than or equal to the isolation voltage of the RMX programmable power supply. For uncovered sections of the shielded cables, use insulation tubes to secure reinforced or double insulation with a capacity greater than or equal to the isolation voltage of the RMX programmable power supply.

The sensing terminals are at approximately the same electric potential as the negative output terminal. Insert the cables so that the wire strands do not touch the chassis when they stick out of the sensing terminal. Also, insert the cables so that the stripped wires do not stick out of the terminal.

Even if you turn the output off or turn the POWER switch off, if the bleeder on/off setting (CF11) is set to oFF, the voltage that was present when the output was on will remain at the output terminals. Set the bleeder on/off setting to on before you touch the sensing terminals.

Regardless of whether local sensing or remote sensing is used, be sure to attach the sensing terminal cover before turning the POWER switch on.

If the sensing cables come loose, the output voltage will rise several volts. To prevent voltage output exceeding the voltage setting, set an appropriate OVP trip point.

When you are finished with remote sensing, return to local sensing mode.

Figure 19. Sensing Cable Connections
Table 2. Sensing Terminals and Functions

Terminal

Function

-S

Negative remote sensing terminal.

-LS

Negative local sensing terminal connected to the negative output terminal.
—

Not connected.

+LS

Positive local sensing terminal connected to the positive output terminal.

+S

Positive remote sensing terminal.

Sensing cable: AWG28 to AWG16
Sensing cable AWG28 to AWG16