Signal/Supply Connection; Standard Application - ABB TTH300 Instructions Manual

Electrical connection
4.3

Signal/supply connection

4.3.1

Standard application

Fig. 9
A Transmitter
When connecting transmitters and power supplies, observe the following specification:
U
Mmin
Where
U
Mmin
U
Smin
R :
Ltg
For HART functionality, use power supplies or SPS input cards with HART mark. If this is not
possible, the interconnection must have a resistance ≥ 250 Ω (< 1100 Ω).
The signal line can be connected with or without ground. When connecting the ground (minus
side), make sure that only one side of the contact is connected to the equipotential bonding
system.
14 - 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
B Power supply / SPS input with supply
TTH300
Control room
CI/TTH300-EN