Emerson Process Management ControlWave EFM 3808 - Manual (Page 96)

2-44 / Installation & Operation CI-ControlWave EFM
Figures 2-29 and 2-30 detail the RS-232 and RS-485 wiring connections required between
the ControlWave EFM and the Model 3808 Transmitter.
Up to eight (8) Model 3808 Transmitters can be connected to a ControlWave EFM via a
half duplex RS-485 Network. An illustration of this network is provided in Figure 2-31.
2.3.9 Power Wiring & Distribution
Power may be provided from a rechargeable 12V lead-acid battery (used in conjunction with
a 30W Solar Panel (with a built-in Regulator) or a user supplied external bulk dc power
supply (4.5 to 16Vdc). A Power Distribution Board is required if the unit is equipped with
an external radio/modem, or 21Vdc Power Supply Board, or Digital to Relay I/O Board (or
any combination of them) and bulk power is supplied from an external bulk dc source.
Figure 2-32 - Pwr. Distribution Bd. and Other Options - Snap Track Mounting
ControlWave EFM Terminal Blocks utilize compression-type terminals that accommodate
up to #14 AWG wire. A connection is made by inserting the wire’s bared end (1/4” max) into
the clamp adjacent to the screw and then securing the screw. The wire should be inserted
fully so that no bare wires are exposed to cause shorts. If using standard wire, tin the bare
end with solder to prevent flattening and improve conductivity. Allow some slack in the
wires when making connections. The slack makes the connections more manageable and
helps to minimize mechanical strain on the terminal blocks.