National Instruments CMS-9068, Поддержание работоспособности оборудования

Страница: 18 / 23

4. Tighten the connector screws.
Note
If you connect power to both the VI and V2 terminals, ensure that the voltage
difference between the two power inputs, measured at the controller power
connector, is at least 500 mV.
Note
The controller draws power from either the V1 or V2 terminals depending on
which terminal has a higher voltage. The controller does not draw power from both
terminals. The controller switches between the V1 and V2 terminals without
affecting operation.
Caution
The C terminals are internally connected to each other. If you use two
power supplies, ensure that they share a common ground.
Caution
The C terminals are internally connected to the controller 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 provides 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 in to the controller or while the power supply
is on.
Powering On the Controller
When you apply power to the CompactRIO device, the controller runs a power-on self test
(POST). The Power and Status LEDs turn on briefly. When the Status LED turns off, the
POST is complete. If the LEDs do not behave in this way when the device powers on, refer to
the information in this document about understanding LED indications.
Understanding LED Indications on the
Controller
The following figure shows the LEDs on the cRIO-9068.
Figure 14. LEDs on the cRIO-9068
POWER
STATUS
USER1
USER FPGA1
Maintaining NI CMS-9068, MMS-9068, and EMSA-9068 Hardware for an NI InsightCM Device | © National Instruments | 17