ABB TTH300 Inbetriebnahmeanleitung Seite 39

4.3.1.1 Standard application with HART functionality
Fig. 10
A Transmitter
Adding resistance R250 increases the minimum supply voltage:
U
Mmin
Where
U
Mmin
U
Smin
R : Line resistance between transmitter and power supply
Ltg
R : Resistance for HART functionality
250
CI/TTH300-X1
Field
≤ U
+ 0.02A x (R + R
Smin Ltg
: Minimum operating voltage of transmitter (refer to technical data for transmitter)
: Minimum supply voltage of power supply / SPS input
B Power supply / SPS input with supply
)
250
TTH300
Electrical connection
Control room
EN - 15