Emerson Rosemount 3490 Series Reference Manual page 25

Reference Manual
00809-0100-4841
Table 3-1: Connection Terminal Descriptions (Wall-mount Control Unit)
Terminal
1
2
3
4-6
7-9
10-12
13-15
16-18
19-21
22-24
25-27
28-29
30
(2)
31
(2)
32
(1) Mains-powered control unit only
(2) Direct current (dc) powered control unit only.
Cable glands for the IP-rated wall-mount unit
The five cable-entry positions are pre-drilled to accept M20 cable glands. The Rosemount
3493 Control Unit has a data download socket factory pre-fitted in one of these cable-
entry positions.
Two cable glands, rated IP65 and suitable for cable with outside diameter 4 to 7 mm, are
supplied for use with the mains supply and transmitter cable. M20 blanking plugs are
supplied for the other three cable entry positions.
All glands and blanking plugs are supplied in a plastic bag. The installer must fit these, or
suitable equivalents, in place of the transit red-caps, to ensure weatherproofing of the
control unit.
The white sealing washers (supplied in the plastic bag) must be fitted on the outside of the
enclosure under the blanking plugs.
Related information
RS232 connections
Cable gland and conduits for the NEMA 4X-rated wall-mount
unit
The Rosemount 3493 Control Unit has a data download socket factory pre-fitted.
Emerson.com/Rosemount
Function
Loop supply
Current input
Cable screen Earth
RS232
Current output
Digital input 1 and 2
Relay 1
Relay 2
Relay 3
Relay 4
Relay 5
(1)
Mains input
I.S. Earth/Ground
Negative
Positive
Installation
January 2021
Terminal marking
24V
Iin
(Earth symbol)
RX-TX-0V
24V-Iout-0V
IN1-IN2-0V
NO-COM-NC
NO-COM-NC
NO-COM-NC
NO-COM-NC
NO-COM-NC
L-N
(Earth/Ground symbol)
-
+
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