Emerson FB3000, Instruction Manual

Page: 32 / 96

Emerson FB3000 RTU Instruction Manual
D301851X012
May 2022
20 Installation
Table 2-3. Extended Backplane Supported Configurations
Voltage
(Control/Loop)
Max number of 3MIX12
Personality Modules installed
Max number of 3MIX12 Personality
Modules with loop power enabled
30V 31 26
24V ≤ V < 30V 31 21
12V≤ V < 24V 21 10
10.5V≤ V < 12V 18 8
The number of mixed I/O modules that can be supported by the FB3000 loop power connectors
varies depending upon the RTU’s external power supply.
For example, if you have a 12V installation, you can see by referring to Table 2-3 that although you
can install up to 21 mixed I/O modules among the base and extension chassis, only 10 can be
powered through the RTU’s loop power connections; you must power the other 11 through a
separate external power supply. Similarly, if you have a 24V installation, and you install the
maximum of 31 mixed I/O modules; the RTU’s loop power can only power 21 of them; you must
power the remaining 10 through a separate external supply.
Figure 2-14: External Power Connections
1 Input power from external power supply (power for RTU)
2 Loop power from external power supply (power for field devices)
Note: If your installation includes multiple chassis, wire power only to the left-most (base) chassis.
Note:
If your FB3000 does not power on, check that the polarity of the DC input voltage wiring
connections match
Figure 2
‐
14 . If you accidentally reversed the polarity, it triggers an internal fuse
and switch to protect the device from damage. Once the polarity is corrected, the switch will reset
automatically to allow for proper operation.