SENECA R203 Installation Manual

Preliminary Warnings

WARNING: Indicates conditions or actions that put the user's safety at risk.

ATTENTION: Indicates conditions or actions that might damage the instrument or connected equipment. The warranty becomes null and void in case of improper use, tampering, or failure to follow instructions.

WARNING: This entire manual must be read before operation. The module is intended for use by qualified electricians only. Specific documentation is available via the QR-CODE shown on page 1.

The module requires repair and replacement of damaged parts by the Manufacturer. It is sensitive to electrostatic discharges; take appropriate measures during operation.

Electrical and Electronic Waste Disposal: Applicable in the European Union and other countries with recycling programs. The symbol on the product or packaging indicates it must be surrendered to an authorized collection center for recycling.

Documentation Reference: R203

Contact Information:

• Company: SENECA s.r.l.
• Address: Via Austria, 26 – 35127 – PADOVA – ITALY
• Tel: +39.049.8705359
• Fax: +39.049.8706287
• Technical Support: support@seneca.it
• Product Information: sales@seneca.it

This document is the property of SENECA srl. Copies and reproduction are prohibited unless authorized. Data may be modified or supplemented for technical and/or sales purposes.

Document Identifier: MI00551-8-EN

Module Layout and Signals

Module Dimensions: Approximately 106.6 mm (width) x 90.0 mm (height) x 32.2 mm (depth).

Weight: 170 g.

Enclosure: UL94-V0 self-extinguishing PC/ABS material, black.

Signals via LED on Front Panel

Technical Specifications

Certifications: CE mark. Declaration of Conformity available at: https://www.seneca.it/products/r203/doc/CE_declaration

Insulation: Diagram illustrates voltage ratings for Analog Input, Analog Output, Digital I/O, PWR, USB, and RS485 connections, indicating rated withstand voltage.

Environmental Conditions:

• Temperature: -25°C to +55°C
• Humidity: 30% to 90% non-condensing
• Storage Temperature: -30°C to +85°C
• Degree of Protection: IP20

Assembly: Mounts on DIN rail 35mm IEC EN60715, or wall/panel with screws.

Connections: Screw terminals with 5 mm, 7.5 mm, and 3.5 mm pitch (RS485). Supports cable section <2.5 mm².

Power Supply:

• Voltage: 90 ÷ 264 Vac @ 50 ÷ 60 Hz
• Max. Absorption: 2.8 W, 5.4 VA
• It is advisable to insert a delayed 1 A fuse.

Communication:

• RS485: Baud rate: 1200 ÷ 115200 baud (refer to user manual for details).

Ports: USB: Micro-USB port for programming.

Input Voltage:

• Voltage: up to 600 Vac, frequency 45 ÷ 65 Hz
• Minimum voltage: 5 V (F.S. 150 Vac); 20 V (F.S. 600 Vac)

TA / TA (mV) Analogue Inputs:

• Current Input: for CT: 1 ÷ 5 Full scale.
• Voltage Input: for CT with voltage output or Rogowski: up to 333 mV full scale.
• Base prec. (*): Network frequency: 50 ÷ 60 Hz. Voltmeter: 0.2 %. Ammeter: 0.2%, Wattmeter: 0.5%.

(*) See the user manual for error limits.

Rogowski Analogue Input:

• Class / base prec. (*): Network frequency: 50 ÷ 60 Hz. Voltmeter: 0.5 %. Ammeter: 0.5%, Wattmeter: 1 %.
• Conversions: 100 mV corresponds to 1000 A @ 50 Hz (sinusoidal); 120 mV corresponds to 1000 A @ 60 Hz (sinusoidal).
• Maximum measurable current: 3 kA @ 50 Hz; 2.5 kA @ 60 Hz.
• Precision after calibration: ± 1 % (see chapter “Rogowski sensor”).
• Linearity: ± 0.2 %.

(*) Accuracy is guaranteed for CosФ > 0.9; Vrms: 40 ÷ 600 Vac; Irms: 0.4 - 100% Rogowski current (excluding error due to external Rogowski sensors). See the user manual for error limits.

Analogue Output:

• Voltage: 0 ÷ 10 Vdc, minimum load resistance: 2 kΩ.
• Current: 0 ÷ 20 mA, 4 ÷ 20 mA, max. load resistance: 500Ω.
• Transmission error: 0.1% of maximum field.
• Response time: 1 s (10% ÷ 90%).
• Temperature drift: 100 ppm/K.

Digital Input: For technical specifications, see electrical connection diagrams on page 5.

Digital Output: For technical specifications, see electrical connection diagrams on page 5.

Counters: Number of counters: 2 at 32 bits; maximum speed: 5KHz.

Installation Category: Category III (up to 600 V) in a direct connection.

Rogowski Sensor

The Rogowski sensor is a ring-shaped device designed for measuring AC, impulsive, or complex waveforms.

For correct use:

• Wrap the ring on the conductor so that the arrow symbol is oriented in the same direction as the conductor current.
• Ensure connections are made correctly.
• For more precise measurement, place the conductor cable centrally within the ring.
• For correct measurement, calibrate the Rogowski sensor by writing the calibration coefficient in the corresponding Modbus register (refer to user manual).

Example: If the sensor has a characteristic of 90 mV / 1000 A, set the calibration register to 1000 / (90 * 10).

Note on Accuracy: The product has a nominal accuracy of 0.5%. Total accuracy is the sum of the device's accuracy and the connected Rogowski sensor's accuracy.

Diagram Description: Illustrates a phase conductor cable with current flow. A Rogowski sensor ring is positioned around it, featuring a closing hook and a symbol indicating current direction. The diagram also shows conductor (+) and (-) terminals, and an optional screen connection.

Electrical Connections

Power Supply: Connected to terminals 40 and 41. Voltage must be 90 ÷ 264 Vac, 50 ÷ 60 Hz. It is advisable to insert a delayed 1 A fuse.

RS485: Terminals B (23), A (24), GND (25). No isolation between RS485 and analogue output.

Analogue Output:

• Provides voltage output (0 ÷ 10 Vdc) or programmable active/passive current (0 ÷ 20 mA).
• Screened cables are recommended for electrical connections.
• No isolation between RS485 and retransmitted output.
• Outputs require programming for correct use.

Digital Output:

• Two digital outputs (DO1, DO2).
• Capacity: Imax = 50 mA, Vmax = 28V.
• Reversible polarity (*). Refer to user manual for functions.

Digital Input:

• Two digital inputs (DI1, DI2).
• Activated with voltage from 12 to 24 V.
• Reversible polarity (*). Refer to user manual for functions.

Wiring Diagrams

CAUTION: Installation must be carried out by qualified personnel. Verify device plate data against network data. Inaccuracies in wiring can cause false measurements or damage. Grounding of TA sensors is possible with negative cable connection. Current measurement requires current transformers. It is advisable to insert a delayed 1 A fuse.

Connections for Rogowski Sensors

Single-Phase (with load division): Diagram shows Volt. Input, L1, L2, L3, N, and terminals 43-55 connected for Rogowski sensor input.

Three-Phase: 4 wires: Diagram shows Volt. Input, L1, L2, L3, N, and terminals 43-55 connected for Rogowski sensor input.

Three-Phase: 3 wires: Diagram shows Volt. Input, L1, L2, L3, N, and terminals 43-55 connected for Rogowski sensor input.

CAUTION: Rogowski sensor inputs are inverted. Please refer to the Rogowski sensor manual for electrical connections.

Connections for Current Output TA

Single-Phase (with load division): Diagram shows Volt. Input, L1, L2, L3, N, terminals 43-55, S1/k, and P1/k connections for current output TA.

Three-Phase: 4 wires: Diagram shows Volt. Input, L1, L2, L3, N, terminals 43-55, S1/k, and P1/k connections for current output TA.

Three-Phase: 3 wires: Diagram shows Volt. Input, L1, L2, L3, N, terminals 43-55, S1/k, and P1/k connections for current output TA.

Connections for Voltage Output TA (mV)

Single-Phase (with load division): Diagram shows Volt. Input, L1, L2, L3, N, terminals 43-55, S1/k, and P1/k connections for voltage output TA (mV).

Three-Phase: 4 wires: Diagram shows Volt. Input, L1, L2, L3, N, terminals 43-55, S1/k, and P1/k connections for voltage output TA (mV).

Three-Phase: 3 wires: Diagram shows Volt. Input, L1, L2, L3, N, terminals 43-55, S1/k, and P1/k connections for voltage output TA (mV).

TV Connections

Single-Phase (with load division): Diagram shows N, L1, and terminals 43, 46 connections.

Three-Phase: 4 wires: Diagram shows N, L1, L2, L3, and terminals 43-46 connections.

Three-Phase: 3 wires: Diagram shows L1, L2, L3, and terminals 44-46 connections.

Ethernet Connection Rules

For Ethernet cabling between devices, use shielded CAT5 or CAT5e cable.

Factory IP Address: The default module IP address is static: 192.168.90.101.

Web Server Credentials: To access the maintenance Web Server using the factory IP address, use the following credentials:

• Account User: admin
• Password: admin / Password Admin: admin

CAUTION: DO NOT USE DEVICES WITH THE SAME IP ADDRESS IN THE SAME ETHERNET NETWORK.

Daisy-Chain Ethernet Connection

CAUTION: IT IS NOT ALLOWED TO CREATE LOOPS WITH ETHERNET CABLES.

Using the daisy-chain connection, switches are not necessary to connect devices. The following examples show correct connections:

[Diagram Description: Illustrates multiple devices connected sequentially in a chain, e.g., Ethernet Switcher -> Device -> Device -> Device.]

There must be no loops in the Ethernet cabling; otherwise, communication will fail. Modules and switches must be connected eliminating any loops. The following examples show incorrect connections:

[Diagram Description: Shows devices connected with loops, indicated by arrows forming circles, and marked with 'LOOP' and an 'X' symbol.]

The LAN fault-bypass function allows the connection between the two Ethernet ports of a device to remain ON even in the event of a power failure. If a device turns off, the chain is not interrupted, and downstream devices remain accessible. This function has a limited duration, typically active for a few days (e.g., 4 days). The fault-bypass function requires that the sum of the lengths of the two cables connected to the switched-off module is less than 100m.

[Diagram Description: Depicts a device labeled 'Device OFF' with two cables connected, and a label indicating the total cable length must be '< 100 m'.]