ABB TTF350 Inbetriebnahmeanleitung Seite 50

Electrical connection
4.5.1.1 Standard application with HART functionality
Fig. 9
A Transmitter
Adding resistance R250 increases the minimum supply voltage:
U
Mmin
Where
U
Mmin
U
Smin
R :
Ltg
R
250
18 - EN
Field
≤ U
+ 0.02A x (R
Smin Ltg
: Minimum operating voltage of transmitter (refer to technical data for transmitter)
: Minimum supply voltage of power supply / SPS input
Line resistance between transmitter and power supply
: Resistance for HART functionality
B Power supply / SPS input with supply
+ R )
250
TTF350
Control room
CI/TTF350-X1