Emerson Rosemount 700XA Reference Manual page 146

Table 9: Backplane Test Points and Associated GC Components (continued)
Test Point
I 24V (Regulated)
24V (Regulated)
17V5
12V
5V1
3V4
FVIN
FVGND
The input voltage range for the DC/DC power supply is between 21 and 30 volts. The input range for AC/DC power supply is 90 -
264 volts (auto-ranging).
Voltage light-emitting diodes (LEDs)
A set of LEDs can be found above the test points .
These LEDs are a quick way to visually inspect the voltage status of some of the gas chromatograph's (GC's) electrical components.
The following LEDs are associated with the following GC components:
Monitoring the detector(s) and columns temperature
Use MON2020 to monitor the temperature of the detector(s) and columns to determine if the GC is thermally stable.
When connected to the GC via MON2020, select Hardware → Heaters to access this function.
146
GC Component
Isolated voltage (loop power)
GC power
Preamp (input for the bridge circuit)
Optional I/O cards
System chips
System chips
Field voltage input
Field voltage ground
VIN (fuse open)
1 RTN - 24 loop
(Power)
24V regulated (GC
power)
17V (Input for the
preamp)
12V (Input for the
I/O cards0
5V1
3V4
Power ON
Glows red when the fuse has blown or been removed;
otherwise, it is not lit.
Glows green when the power supply for the analog outputs is
functioning properly; otherwise it is not lit.
Glows green when the GC power is functioning properly;
otherwise, it is not lit.
Glows green when the power supply for the preamp is
functioning properly; otherwise, it is not lit.
Glows green when thee optional ROC expansion card's power
supply is functioning properly; otherwise, it is not lit.
Glows greeen when the system chip's 5.1 V power supply is
functioning properly; otherwise, it is not lit.
Glows green when the 3.4 V power supply for the system chips
is functioning properly; otherwise, it is not lit.
Note
Some boards have different shades of green for this LED.
Glows green when the GC is on; otherwise, it is not lit.
July 2020
Tolerances
24 V (±2.4 V)
24 V (±2.4 V)
17.5 V ±0.5 V
12 V ±0.6 V
5.1 V ±0.25 V
3.4 V ±0.15 V
0 V ± 3 V
21 V ± 30 V
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