Rockwell Automation 1797-IRT8 FLEX Ex Thermocouple/RTD/mV Input Module User Manual - Manual (Page 72)

Publication 1797-6.5.2 - February 2001
A-6 Specifications
Wiring Methods
•
Wiring method 1 - Each channel is wired separately.
•
Wiring method 2 - Multiple channels in one cable, providing each
channel is separated in accordance with the National Electric Code
(NEC).
Table 1
Table 2
€ The entity concept allows interconnection of intrinsically safe
apparatus with associated apparatus not specifically examined in
combination as a system when the approved values of V
oc
and I
sc
or V
t
and I
t
of the associated apparatus are less than or equal to V
max
and I
max
of the intrinsically safe apparatus and the approved values of C
a
and L
a
of the associated apparatus are greater than C
i
+ C
cable
and L
i
+ L
cable
respectively for the intrinsically safe apparatus.
ó Simple apparatus is defined as a device which neither generates
nor stores more than 1.2V, 0.1A, 20
µ
J, or 25mW.
ì Wiring methods must be in accordance with the National Electric
Code, ANSI/NFPA 70, Article 504 and 505. For additional information
refer to ANSI/ISA RP12.6.
ö This module, 1797-IRT8, must be used with terminal base
1797-TB3 or 1797-TB3S.
ú Terminals 36 and 49 shall not be connected.
÷ WARNING: Substitution of components may impair intrinsic
safety.
Wiring
Method
Channel Terminals V
oc
(V) I
sc
(mA)
V
t
(V) I
t
(mA)
Groups C
a
( µ F) L
a
(mH)
1 and 2 Any one
channel e.g.
ch0
0(+), 1(H), 2(L),
3(-)
9.0 37.0 - - A, B 3.0 20.0
C, E 9.0 60.0
D, F, G 24.0 160.0
37, 38, 39
(CJC0)
or
46, 47, 48
(CJC1)
9.0 1.0 - - A, B 3.0 1000.0
C, E 9.0 1000.0
D, F, G 24.0 1000.0
0(+), 1(H), 2(L),
3(-)
37, 38, 39
(CJC0)
or
46, 47, 48
(CJC1)
- - 9.0 38.0 A, B 3.0 20.0
C, E 9.0 60.0
D, F, G 24.0 160.0
Terminals V
t
(V) I
t
(mA) Groups C
a
(
µ
F) L
a
(
µ
H)
Male Bus
Connector
5.8 400 A-G 3.0 3.0