
EMS-96
Instruction Manual
IM1200-U v1.6
Pag. 26 / 48
Measure
Setup
Measure
Transform ratio
Transform Ratio
Range
Default
CT ratio
1 ÷ 5000
1
It’s the ratio between the primary and the secondary circuit of the external current transformers.
I-D ratio
1 ÷ 5000
1
4
th
current input transform ratio.
VT ratio
1 ÷ 5000
1
It’s the ratio between the primary and the secondary circuit of the voltage transformers.
Setup
Measure
Time window
Time window
Range
Default
Upgrade time [minutes]
1 / 2 / 3 / 5 / 6 / 10 / 12 / 15 / 20 / 30 / 60
15
The time used to calculate the average, maximum, minimum values and the expected power.
Type
shifting / fixed
shifting
The type of the window to calculate the average values and expected power.
Setup
Measure
Frequency
Frequency
Range
Default
Fundamental [Hz]
50 / 60
50
Select the base frequency of the inputs (voltages and currents).
Phase monitored
L1 / L2 / L3
L1
It’s the phase that will be monitored to detect of SAG and to read the actual frequency.
Setup
Measure
SAG
SAG (option)
Range
Default
Threshold [RMS voltage]
30 ÷ 400
210
If the voltage value drops below the setting, the software considers the event as SAG.
Time [ms]
1 ÷ 1000
32
If the voltage value drops below for a time greater than the setting, the software considers the event as SAG.
Fig.1: Sag parameters
Fig.2: Sag Explanation
A sag is defined as an under voltage condition that persists for more than one period of base frequency. A shorter under voltage
condition is called a dip (see Fig. 2). The occurrence of sag could announce an impending loss of power.
To set the sag register
the voltage must be under the
Threshold
value for a minimum time defined in
Time
.
Setup
Measure
Wiring/Conventions
Wiring/Conventions
Range
Default
Type of wiring
3 phase [4 or 3 wires] / ARON / balanced 3-phase / 3-ph
multiload balanced / single-phase / 1-phase multiload /
multi single-phase / 2-phase 3 wires
3 phase [4 or 3 wires]
See table below.
Neutral current
Measured / Computed
See below
On this item appears
Measured
if the CT is present or
Computed
if the CT is not present. The user can change the set showed.
Power factor convention
SIGN / IEC / DIN IEEE
SIGN
See the following picture for details on the selected configuration.
Powers measurement
W, VAr / mW, mVAr
W, VAr
It allows to modify the basic unit of measure of the powers (showed and read by the communication interface).
Energy measurement
kWh, kVArh / MWh, MVArh
kWh, kVArh
It allows to modify the basic unit of measure of the energies (showed and read by the communication interface).