Rosemount 3491 - Page 25

Reference Manual
00809-0100-4841, Rev. AA
May 2007
3-7
Rosemount 3490 Series
Cable gland and conduit notes for NEMA4X-rated Wall Mount
It is the responsibility of the user to ensure suitable cable glands or conduit
connections are used when wiring to the 3490 Series Control Unit to maintain
the enclosure integrity.
Protective earth cables must be connected to at least one of the bonding
points on the inside of the enclosure. Bonding between conduit entries is not
automatic and must be provided as part of the installation.
Model 3493 has a data download socket factory pre-fitted.
NOTE:
In Intrinsically Safe systems, apparatus connected to the 3490 Series Control
Unit must not be supplied from a voltage greater than 250V r.m.s. or 250V dc.
Figure 3-2.
Connection terminals layout
(mains powered wall mount unit)
(DC powered version has slightly different layout i.e. terminals 31 and 32 replace terminals 28 and 29).
Transmitter connections are on the left side of the terminals enclosure.
The Intrinsically Safe Earth (terminal 30) must be connected to a
High Integrity Earth if the transmitter connected to terminals 1 and 2 is sited in
a hazardous area.
Table 3-1. Connection
descriptions for wall mount unit
10 11 12
0VIN2IN1
789
24V I out 0V
456
RX TX
0V
13
16
14
17
15
18
NO COM NC
NCCOMNO
25 26 27
NO COM NC
19
22
20
23
21
24
NO COM NC
NCCOMNO
1
24V I in
2 3
FUSE 200mA (T)
28
L
N
29 30
IS EARTH
Terminal Function Layout
1 Loop supply 24V
2 Current input Iin
3 Cable screen Earth (Earth symbol)
4-6 RS232 RX-TX-0V
7-9 Current output 24V-Iout-0V
10-12 Digital input 1 and 2 IN1-IN2-0V
13-15 Relay 1 NO-COM-NC
16-18 Relay 2 NO-COM-NC
19-21 Relay 3 NO-COM-NC
22-24 Relay 4 NO-COM-NC
25-27 Relay 5 NO-COM-NC
28-29
(1)
(1) Mains powered control unit only.
Mains input L-N
30 I.S. Earth (Earth symbol)
31
(2)
(2) DC powered control unit only.
Negative -
32
(2)
Positive +