Instruction manual

Instruction Manual
760006-A
September 2001
Rosemount Analytical Inc. A Division of Emerson Process Management Description and Specifications 1-7
Model NGA 2000 Platform
Variable and I/O Modules can still send ac-
curate data to external recording devices. If
the controller loses contact with an Ana-
lyzer, it indicates this fact with the phrase
“No Data” replacing the normal Analyzer
reading.
c. Power Input Module/Power Supply
Power can be supplied to all NGA 2000
components through the Power Input Mod-
ule, which plugs into the Backplane. Exter-
nal line voltage (85 to 264 VAC, 50 to 60
Hz) is supplied to the Power Input Module
and conditioned for usage by other NGA
2000 components. See Figure 1-3 and Fig-
ure 1-10.
The Power Supply Board also plugs into the
Backplane and conditions incoming power
for usage by all modules (only one Analyzer
module). The Power Supply Board provides
+24 VDC at 5A.
Alternatively, the user may supply regulated
24 VDC directly to the Platform through the
Power Input Module. If multiple Analyzer
modules are used, a larger 30 A Bulk Power
Supply is required to power the system.
If the user initially applies AC power and
then applies DC power, the DC circuitry as-
sumes control, and all components may
continue operating without interruption but
may reset depending on the current draw. If
the user initially applies DC power, applica-
tion of AC power will have no effect. DC
power will remain in control. If both AC and
DC power have been applied, removal of
DC power will reset the system, and AC cir-
cuitry will then assume control.