Seneca S203RC-D User manual

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This document is property of SENECA srl. Duplication and reprodution are forbidden, if not authorized.
Contents of the present documentation refers to products and technologies described in it. All technical data
contained in the document may be modified without prior notice Content of this documentation is subject to
periodical revision.
SENECA s.r.l.
Via Austria, 26 – 35127 – PADOVA – ITALY
Tel. [phone] - Fax [phone]
For manuals and configuration software, please see www.seneca.it
Contents:
- General Specifications
- Technical Specifications
- Installation Rules
- Electrical connections
- Modbus connection rules
- DIP-switches settings
- Digital inputs
- Leds Signallings
- Factory Settings
Contents:
- General specifications
- Technical features
- Functioning
- Rogowski’s coil
- Electrical quantities
- Electrical connections
- LEDs signallings
- Serial interface
- Case and screw terminal numbers
- Front panel
- Display programming
Installation
Manual
Installation
Manual
Installation
Manual
Installation
Manual
S203RC-D
S203RC-D
Advanced Three-phase Network Analyzer
with display for Rogowski’s sensors
Serie S - Analizzatori di rete
EN
EN
SENECA
S

Communication port
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RS485 Baud rate: 1200..115200 baud. Protocol: Modbus RTU
Voltage input
Input
Up to 600 Vac, frequency 50 or 60 Hz
Class/Base Precision (1) Network Frequency: 50 or 60 Hz.Voltmeter : 0,5 %.
Amperometer : 0,5 %. Wattmeter : 0,5 %.
(1) Precisions are given in the following range:
(without error due to external Rogowski’s coil)
Type
Digital output for energy counter
Passive (it has to be powered on), no protection for short circuit
Range 50 mA / 28 V
Model S203RC-D is a complete three-phase network analyzer, with display, that can be use
only with Rogowski’s coil: up to 600Vac voltage range, max current equal to 2000 A
connected to the inputs.The instrument provides all the following electrical measurable
quantities: Vrms, Irms, Watt, VAR, VA, Frequency, Cos and Active Energy. All
measurements given above (except frequency) are available both single-phase and three-
phase.Measurements are read through serial communication both in floating point and
normalized format (except Frequency and Active Energy).It is possible the analog
retransmission of any Vrms, Irms, Watt and Cos quantity either single phase or three-
phase, or any phase chosen (by specific display or MODBUS registry). The module is also
distinguished by:
Communication configurability through software.
RS485 serial communication with MODBUS-RTU protocol, maximum 32 nodes.
Easy-wiring of power supply and serial bus by means of the bus housed in the DIN rail.
High precision: 0,5 % class.
Protection against ESD discharge up to 4 kV.
Measure input insulation: 4000 Vac towards all the other circuits.
Insulation between communication and power supply: 1500Vac.
Insulation between retransmitted output and power supply: 1500Vac.
Analog output signal settable in voltage or current.
Digital output for energy counter
All kind of insertion possible: single phase, Aron, four wires
Possibility to compensate errors caused by frequency change in places where network
frequency is not stable (frequency changes > 30 mHz).
GENERAL SPECIFICATIONS
TECHNICAL FEATURES
Vrms: 40..600 Vac; Cos>0,9
Irms: 0,4-100% Iprimary of Rogowski’s coil
USB Mini-USB, for programming (software Easy)
Output signal for S203RC-D current input:
• 100 mV correspond to 1000 A @ 50 Hz (sinusoidal)
• 120 mV correspond to 1000 A @ 60 Hz (sinusoidal)
Rogowski’s coil
features, supplied by
Seneca and calibrated
(accessory
RC-V400-100)
Max measurable current: 100 kA @ 50/60 Hz
Internal resistance: 30 Ohm / 400 mm
Accuracy after calibration: ± 1 % (see the chapter
«Rogowski’s coil»)
Linearity: ± 0.2 %

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Connections
Dimensions / case / display
Storage temperature
International
protection
-20 ..+85°C
IP20
Connections Screw terminals, 5,08 / 7,5 pitch
Dimensions 105 x 89 x 60 mm
Plastic UL 94 VO, grey color.
Standards
Reference standards :
EN61000-6-4 (electromagnetic emission, industrial environment).
EN61000-6-2 (electromagnetic immunity, industrial environment).
EN61010-1 (safety)
Case
Other Specifications
Environmental conditions
Voltage
Consumption
11 ..40 VDC
or 19 ..28 VAC @ 50 ..60 Hz
Max 2,5 W
Temperature
Humidity
-10 ..+65°C
30 ..90%
Voltage Output
Analog Output
0..10 Vdc, 0..5 Vdc, Min. load resistance: 2 k
Current Output
0..20 mA, 4..20 mA, Max load resistance: 500 
Transmission error
Response time
0,1 % (max range).
2 s (10%..90%)
Isolations
Insulation voltage 4000 Vac between the input and all the other circuits.
1500 Vac between power supply and communication.
1500 Vac between power supply and analog output.
Display Front LCD 2 lines x 16 characters alphanumeric (backlighted)
Thermal stability 100 ppm / K
Installation
Installation category II (up to 300 V)

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OPERATING LOGIC
The module measures the following electrical quantities: Vrms, Irms, Watt, VAR,
VA, Frequency, Cos and Active Energy, and provides the values in the
corresponding MODBUS registers.
In three-phase environments, measurements given above corresponding to any
phase are available, other than the three-phase value (except the frequency).
These measurements are rendered in both floating point and normalized format
(except Frequency and Active energy) between 0..+10000 (-10000 ..+10000 for
VAR e Cos). Active energy value is stored in memory and when the instrument is
switched off, the last value before switching is kept in memory.
The module output can transmit one of the following quantities: Vrms, Irms, Watt,
cos as either a current or voltage value. If the instrument is set for three-phase
measurements, it transmits automatically the three-phase value of the selected
measurement. However, via MODBUS register, the user can choose to transmit
the measurement corresponding to any phase: A, B, C.
The user can set through MODBUS the values MIN and MAX of the
measurement to transmit corresponding to 0% and 100% of the analog output.
For example, if the signal is transmitted as current 4..20 mA and the quantity to
transmit is voltage Vrms in the 10..300 V range, (therefore MIN=10, MAX=300),
then if Vrms measured is 10V, analog output will be 4mA, while if Vrms=300V
output will be 20mA. In the intermediate points the behaviour is linear. The analog
output values saturate at approximately 11 V for voltage output and at 22mA for
current output (analog output clamped at 110 %).
If network frequency oscillates more than 30 mHz from rated values (50 o 60 Hz),
it’s possibile to compensate errors on measurements of Power and Energy
caused by these variations. This option is selectable via MODBUS register. Vrms
and Irms measurements are not influenced by these variations.
When the module is switched on, the appropriate setting coefficients are
measured (depending on the choice of 50 or 60 Hz frequency). All the settings
made will be automatically loaded when the module is reset.
NOTE: without load connected to the S203RC-D, only the (displayed) voltage
and frequency assume a corrected value.
ROGOWSKI’S COIL
Rogowski’s coil have been designed for accurate non-intrusive measurement of
AC, pulsed DC or complex waveforms. To use in an appropriate way,
- wrap the ring on the conductor so that the arrow symbol (stamped in the ring) is
oriented in the same direction of the current in the conductor
- make sure that the connections are performed properly: the white output wire is
positive (+), the brown wire is the negative (-).

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Retransmission range
Reactive Power
Electrical Quantity Measurement Range
V rms 0..600 Vac
I rms
Active Power
Apparent Power
Cos
Frequency
0..1000 A
(0..1000 * 600)W
(0..1000 * 600)VAR
(0..1000 * 600)VA
0..1
40..70 Hz
CLOSURE HOOK
AND SYMBOL OF
CURRENT
DIRECTION
PHASE
CONDUCTOR
ROGOWSKI’s
COIL
Current
direction
in the
conductor
WIRE (+) WIRE (-)
SHIELD
(if present)
- For an more accurate measurement, place the cable conductor in a central
position with reference to the ring
- For a correct measurement, calibrate the Rogowski’s coil: write the calibration
coefficient to the corresponding Modbus register (refer to the user manual) or set it
using the menu on the display (see display programming manual).
Example: if the Rogowski’s coil feature is 90 mV / 1000 A, set the tarature register
(corresponding to the phase where the Rogowski’s coil is applied) with the value:
1000 / (90 · 10).
NOTE ABOUT ACCURACY: The device is provided with 0.5% accuracy.
Global accuracy is the sum between the device accuracy and the connected
Rogowski’s coil accuracy.

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ELECTRIC CONNECTIONS
ARON
Three-Phase
without Neutral
POWER SUPPLY
25
26 11 ÷ 40 VDC
19 ÷ 28 VAC
2.5 W GND
A
B
32
31
33
RS 485
SINGLEPHASE
Phase Neutral
VG
A
N
22212019
181716151413
Rogowski’s
coil ZL
x
+-+-+-
VG
A
C
B
22
21
2019
181716151413
ZL
x
x
+-+-+-
VG
A
C
B
22212019
181716151413
N
ZL
x
x
x
+-+-+-
3 WIRES
Three-Phase
without Neutral
VG
A
C
B
22212019
181716151413
N
ZL
x
x
x
+-+-+-
VG
A
C
B
22212019
181716151413
N
ZL
x
x
x
+-+-+-
There is no
insulation between
RS485 and the
analog output
4 WIRES
Three-Phase
with Neutral
Note: Connect the shield of the Rogowski’s coil at
negative (-), so one of the terminals 14, 16, 18, 22.
Terminals 14, 16 18 and 22 are internally connected.

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Segnalazione tramite LED
Blinking
(RED)
ON
(GREEN)
Blinking
(RED)
STATUS
The module is power on
Data are being transmitted through the
RS485 comm. port
LEDs signallings
ERR
PWR
TX
RX
LED
Segnalazione tramite LED
LEDs signallings
Voltage
VA
+
Active current (1)
External power supply
current (2)
There is no insulation between RS485 and the analog output.
34
35
35 34
36 36
+
Data are being received through the
RS485 comm. port
At least one of the active phases’ voltage
is less than 40 Vac
ON
(YELLOW)
DIGITAL OUTPUT
The module has a digital output: each pulse corresponds to a given number
of increments about to the energy counter. Imax=V/R=50 mA, Vmax=28V. For more
informations, see the display settings manual.
For detailed information on RS485 serial interface, consult the documentation provided by
the website www.seneca.it, in the section Prodotti/Serie Z-PC/MODBUS TUTORIAL.
SERIAL INTERFACE
Digital output
29
30
I
R
V
ANALOG OUTPUT
The module provides a programmable, analog output in voltage (0..10 Vdc) or active and
passive current (0..20 mA). We recommend using shielded cables for the electric
connections.
Segnalazione tramite LED Segnalazione tramite LED
Programming
The communication parameters have the following default values:: baudrate=38400, no
parity, bit number=8, bit stop=1. These values can be modified by display or Modbus protocol.
To program the device, download the free software Easy Setup from the website
www.seneca.it.

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FRONT PANEL
S203RC-D
OK
MENÙ
ESC
A)MEASURE CONFIG
Disposal of Electrical & Electronic Equipment (Applicable throughout the European Union and other European
countries with separate collections programs). This symbol, found on your producr or on its packaging, indicates
that this product should not be treated as household waste when you wish to dispose of it. Instead, it should be
handed over to an applicable collection point for the recycling of electrical & electronic equipment. By ensuring this
product is didposed of correctly, you will help prevent potential negative consequences to the environment and
human health, which could otherwise be caused by inappropriate disposal of this product. The recycling of materials
will help to conserve natural resources. For more detailed information about the recycling of the product, please
contact your local city office, waste disposal service of the retail store where you purchased this product.
For detailed information on display programming, consult the documentation provided by the
website www.seneca.it.
DISPLAY PROGRAMMING
CASE AND SCREW TERMINAL NUMBERS
TX RX
PWR
ERR
For communication
debugging, remove
the terminals cover to
see the internal LEDs.
26 25 22 21 20 19
10 11 12
SSENECA
S203RC-D
13 14 15 16 17 18
36 35 34 33 32 31 30 29 28