Emerson FB1100 - Connecting DC Power

FB1100 Flow Computer Instruction Manual
D301752X012
November 2023
Installation 31
Power connections are made through conduit fittings to the terminal plate. Remove the
rear cover for access to the terminal plate.
For solar power connections, refer to Section 2.12.4.
2.11.1 Connecting DC Power
DANGER
EXPLOSION HAZARD: Ensure the area in which you perform this operation is non-
hazardous. Performing this operation in a hazardous area could result in an explosion.
When power comes from an external DC supply, connect using the +DCIN and –DCIN
terminals. Use standard copper wire (#18 AWG minimum). The device supports 6V, 12V
and 24V power supplies. It accepts DC voltage from 5.7 to 30V; the amount of power
required varies depending upon the options used.
Figure 2-18. DC Power Connections
1
To External power supply
Note
If your flow computer does not power on, check that the polarity of the DC input voltage
wiring connections match Figure 2‐18. If you accidentally reversed the polarity of the
connectors, it triggers a polyfuse (positive coefficient temperature thermistor) to protect
the device from damage. Once the polarity is corrected, the polyfuse resets automatically
to allow for proper operation.