CARLO GAVAZZI EM330 Instrucciones De Instalacion Y Uso página 4

11 11
T T
13 13
B+ B+
12 12
A- A-
GND 14 GND 14
Fig. 12
Connection diagram (Fig. 3–Fig. 13)
Figure
Three-phase system current, 4-wire, unbalanced load and three current transformers (TA). 315 mA fuse
Fig. 3
(F).
Three-phase system current, 4- wire, unbalanced load, three current transformers (TA) and three
Fig. 4
voltage transformers (TV)
Three-phase system current, 3-wire, unbalanced load and three current transformers (TA). 315 mA fuse
Fig. 5
(F).
Three-phase system current, 3-wire, unbalanced load, three current transformers (TA) and two voltage
Fig. 6
transformers (TV)
Two-phase system current, 3-wire and two current transformers (TA). 315 mA fuse (F).
Fig. 7
Fig. 8 Two-phase system current, 3-wire, two current transformers (TA) and two voltage transformers (TV)
Auxiliary power supply
Fig. 9
Digital input. Open contact = tariff 1, closed contact = tariff 2.
Fig. 10
Pulse output (two possible connections)
VDC: external voltage (direct current)
Out: output contact (transistor PNP open collector)
Fig. 11
GND: ground output contact (transistor PNP open collector)
Open collector outputs: the load resistance (Rc) must be designed so that the closed contact current is
under 100 mA (V
RS485 Modbus with Master
Note: additional instruments with RS485 are connected in parallel. The serial output must only be
Fig. 12
terminated on the last network device connecting terminals B+ and T. For connections longer than
1000 m or networks with more than 160 instruments, use a signal repeater.
Fig. 13 M-Bus with Master
8021422 | EM330
Modbus
Master
B+
A-
GND
is equal to 1 V dc). DC voltage (V
on
11
PC 12
M+ M-
Fig. 13
Description
) must be less than or equal to 80 V.
off
M-Bus
Master
11
12
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PC