Connection Check - CARLO GAVAZZI EM340 Instrucciones De Instalacion Y Uso

Connection diagram (Fig. 5–Fig. 9)
Figure
Fig. 5 Three-phase system current, 4-wire. 315 mA fuse (F).
Three-phase system current, 3-wire
Fig. 4
Two-phase system current, 3-wire. 315 mA fuse (F).
Fig. 3
Fig. 6 Digital input. Open contact = tariff 1, closed contact = tariff 2.
Pulse output (two possible connections)
VDC: external voltage (direct current)
Out: output contact (transistor PNP open collector)
Fig. 7
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. 8
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.
M-Bus with Master
Fig. 9

Connection check

The analyzer checks whether connections are correct and signals any faults.
The check can be disabled using the Install parameter, see
Initial assumptions
The check is based on some initial assumptions on the system to be measured. Specifically, it is assumed that each
system phase is characterized by:
a load with PF>0.766 (<40°) power factor if inductive or PF>0.996 (<5°) if capacitive
l
current at least equal to 10% rated current (65A)
l
Controls and signals
Following are the controls in the order in which they are run and corresponding signals:
Control
Voltage order
Current direction *
NOTE *: control only run if the imported and exported energies are measured separately (Measure = b).
8021424 | EM340
is equal to 1 V dc). DC voltage (V
on
Description
) must be less than or equal to 80 V.
off
"Parameters (Fig. 13)" on page 8.
©2014 | CARLO GAVAZZI Controls SpA| 4
Signal
+ of the involved phase
of the involved phase