ABB TTF300 - Explosion Protection Marking (Multiple Types)

Electrical connections
24 - EN TTF300 CI/TTF300-EN
s
4.5.2 HART functionality
Panel Control room
AB
+
-
U
M
+
U
S
-
R
Ltg
A00095
R
250
Fig. 14
A Transmitter B Supply isolator / PCS input with supply
Adding resistance R
250
increases the minimum supply voltage:
U
Mmin
 U
Smin
+ 0.022 A x (R
Ltg
+ R
250
)
Where
U
Mmin
: Minimum operating voltage of transmitter
U
Smin
: Minimum supply voltage of supply isolator / PCS input
R
Ltg
: Line resistance between transmitter and supply isolator
R
250
: Resistance of resistor for HART functionality
For HART functionality, use supply isolators or PCS input cards with a HART mark. If this is not
possible, a  250  (< 1100 ) resistor must be added to the interconnection.
The signal line can be operated with or without grounding. When establishing a ground
connection (minus side), make sure that only one side of the terminal is connected to the
equipotential bonding.
s
4.5.3 PROFIBUS PA and FOUNDATION Fieldbus H1 functionality
Panel Control room
AB
+
-
U
M
+
U
S
-
R
Ltg
A00094
Fig. 15
A Transmitter B Segment coupler
When connecting these components, observe the following condition:
U
Mmin
 U
Smin
+ 0.012 A x R
Ltg
Where
U
Mmin
: Minimum operating voltage of transmitter
U
Smin
: Minimum supply voltage of supply isolator / PCS input
R
Ltg
: Line resistance between transmitter and supply isolator