Carlo Gavazzi PQT-90 - Manual (Page 26)

PQT-90 Instruction manual
Installation
Input features
52
59
49
PQT-90 Instruction manual
48
Installation
Optional modules connections
40
45
❑
RS485/422 (AR1034) Serial port
4-wire connection. Additional devices provided with
RS485/422 (that is RS 1,2,3,...N) are connected in parallel.
2-wire connection. Additional devices provided with
RS485/422 (that is RS 1,2,3,...N) are connected in parallel.
The termination of the serial output is carried out
only on the last instrument of the network, by
means of a jumper between (Rx+) and (T). We rec-
ommend you to use the 4-wire connection: by
means of the serial port the data are exchanged
faster.
■
Electrical diagrams
❑
Three-phase, 3/4 wires, Balanced load
Direct connection
(3-wire system) CT connection
(3-wire system)
CT and VT connection
(3-wire system) Direct connection
(4-wire system)