
EMS-96
Instruction Manual
IM1200-U v1.6
Pag. 7 / 48
In case of connection in a 3 phase network (without
neutral or with neutral not distributed) don’t connect the
N terminal.
WARNING: If the instrument has the TTA on the current
inputs, DON’T connect the S2 terminals to the earth.
This connection with only 2 CT allows to measure
accurately the three-phase currents.
WARNING: If the instrument has the TTA on the current
inputs, DON’T connect the S2 terminals to the earth.
This connection can be used with distributed and equal
loads.
It is possible to measure the current on one phase (using
only one CT). The unmonitored phase currents are
mathematically calculated.
The measurement of neutral current is optional.
WARNING: If the instrument has the TTA on the current
inputs, DON’T connect the S2 terminals to the earth.
In presence of multiple balanced loads in a three-phase
network, the instrument calculates the electrical
parameters checking a single phase current for each load,
allowing to limit the number of CT used.
WARNING: If the instrument has the TTA on the current
inputs, DON’T connect the S2 terminals to the earth.
Three-Phase, balanced loads, 4-Wires Configuration
Three-Phase, balanced multiple loads, 4-Wires Configuration
Three-Phase, 4-Wires Y Configuration
Three-Phase, 3-Wires Configuration. ARON insertion (2CT)
LOAD
N
L1
L2
L3
EMS
P2
S2
P1
S1
S1
S1
S2
S2
S2
S1
N
VL
3
VL
2
VL
1
In
I3
I2
S1
S2
I1
P1
S1
P1
S1
P1
S1
LOAD
L1
L2
L3
EMS
P2
S2
S1
S1
S2
S2
S2
S1
N
VL
3
VL
2
VL
1
In
I3
I2
S1
S2
I1
P1
S1
P1
S1
N
L1
L2
L3
LOAD
EMS
S1
S1
S2
S2
S2
S1
N
VL
3
VL
2
VL
1
In
I3
I2
S1
S2
I1
P2
S2
P1
S1
N
L1
L2
L3
N
L1
L2
L3
N
L1
L2
L3
LOAD
LOAD
LOAD
EMS
S1
S1
S2
S2
S2
S1
N
VL
3
VL
2
VL
1
In
I3
I2
S1
S2
I1
P2
S2
P1
S1
P2
S2
P1
S1
P2
S2
P1
S1