cRIO-9012/9014 Operating Instructions and Specifications
6
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reverse-voltage protection. Complete the following steps to connect power
supplies to the controller.
1.
Connect the positive lead of the power supply to the V1 or V2 terminal
of the COMBICON power connector shipped with the controller, and
tighten the terminal screw. Figure 4 shows the terminal screws, which
secure the wires in the screw terminals, and the connector screws,
which secure the power connector on the controller.
Figure 4.
COMBICON Power Connector
2.
Connect the negative lead of the power supply to one of the C terminals
of the power connector and tighten the terminal screw.
3.
Optionally, you can connect the positive lead of another power supply
to the other V terminal and the negative lead to one of the C terminals.
You must install the ferrite across both pairs of wires.
4.
Install the power connector on the front panel of the controller and
tighten the connector screws.
Note
The controller draws power from
either
V1 or V2 depending on which terminal has
a higher voltage. It does not draw power from both terminals. The controller switches
between V1 and V2 without affecting operation.
Caution
The C terminals are internally connected to each other. If you use two power
supplies, make sure that they share a common ground.
Caution
The C terminals are internally connected to the controller chassis to prevent a
faulty ground connection from causing the chassis ground to float. If you reverse the input
voltage, the positive input voltage is connected directly to the chassis. The controller
has built-in reversed-voltage protection, but reversed voltage can damage connected
peripherals if the chassis ground is not reliably connected to earth ground.
Caution
Do not tighten or loosen the terminal screws on the power connector while the
power connector is plugged into the controller or while the power supply is on.
1
Terminal Screws
2
Connector Screws
C
V2
C
V1
2
1
2
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