EMC-D3b
EMC-D3b-485
instructon manual
IM450-U v3.1
page 3
For a correct use of the device, the wiring diagram contained in the present manual, must be respected.
The connections are available on the screw terminal:
- auxiliary power supply:
The power supply is take from voltage inputs.
Are available 5 different auxiliary supply:
0 - 115V = 100-130V 50-60Hz (N-L1) (on request by single phase option)
0 - 230V = 220-240V 50-60Hz (N-L1) (on request by single phase option)
0 - 400V = 380-415V 50-60Hz (L1-L2) standard model
0 - 230V = 220-240V 50-60Hz (L1-L2) (on request)
0 - 115V = 100-130V 50-60Hz (L1-L2) (on request)
It’s possible, for example, to give an auxiliary power supply between phase and neutral, in a 4 wires system, or phase-
phase in a 3 wires system, without neutral or from a VT in a medium voltage application.
In the standard version the voltage is 400V and it’s taken between the phases L1-L2.
In the following table it’s possible to see the measurable voltage depending of the type of power supply.
power supply terminals
rated voltage
range of measurable voltage
VL1 - VL2
(phase to phase power supply for 3-phase networks)
400V
300÷500V phase to phase (175÷290V phase-neutral)
230V
175÷290V phase to phase (130÷170V phase-neutral)
110V
85÷145V phase to phase (50÷85V phase-neutral)
VL1-N
(phase-neutral power supply for single phase networks)
230V 175÷290V
phase-neutral
110V 100÷170V
phase-neutral
The standard version allows to apply the instrument at all the three-phase network 400V with or without neutral supplied.
For example for application on single phase 230V will need the L1-N / 230V. while for applications in medium voltage (for
example using external voltage transformer 15 / 0.1 kV phase to phase) will need the version L1-L2 / 110V.
- measuring voltage inputs:
4 screw terminals are available for the 3 phase plus neutral system network. The maximum voltage between phase to
phase must not overcome 500 Vrms
.
, depending always on the instrument's power supply.
In case of three phase application with or without neutral not distributed, it is enough not to connect the terminal N.
The transformation ratio of the external Potential Tranformer’s can be set on the instrument's SETUP menu (see
SeT
VT
ratio.
- measuring current inputs:
6 screw terminals are available for the connection of the external CT with secondary 5A. It is also possible to use 2 CT in
a three phase system (3Phase Aaron wiring system).
It’s compulsory to use external CT’s.
The transformation ratio of the external CT's can be set on the instrument's SETUP menu.
NOTE: It’s fundamental to respect the correct phase sequence. The connections between current and voltage phase inputs must not be
inverted (for example, CT placed on phase L1 must correspond to the I1 input) and at the same time it’s not correct to invert the S1 and
S2 terminals considering that the energy metering won't be reliable.
- digital input
On the terminal board 30 (DI+) and 32 (DI-) is available the digital input.
This input can operate in three differents mode:
- Sync:
can recognize pulse (minimum time = 200 mS) to syncronize the internal average period timer to an external
device; this property is available with the energy count mode ( refer to SETUP section) is set to
'TOTAL/PARTIAL' or to 'NORMAL';
- Reset
when a voltage pulse of minimum 1 second is applied, perform the reset of the only PARTIAL energy
counters of each energy type (kWhr, kVArhr, kVAhr); this property is available with the energy count mode
(refer to SETUP section) is set to 'TOTAL/PARTIAL';
- Disabled No operation is done depending the digital input status.
When the energy count mode ( refer to SETUP section) is set to 'TIME.BAND’ the counting is divided in T1 or T2 band
depending the status of digital input; SETUP of digital input is disabled;
Timeband T1 is selected when no voltage is applied, T2 when the input is powered
Each parameters (kWh, kVArh and kVAhr) have two counters T1 and T2, in which the energy is counted depending the
status of digital input.
