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DigiRail-VA
User Manual
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NOVUS DigiRail-VA User Manual

DigiRail-VA
INSTRUCTION MANUAL - V1.0x A
MAIN FEATURES ............................................................................................................................................................... 2
SPECIFICATIONS .............................................................................................................................................................. 3
INSTALLATION AND OPERATION .................................................................................................................................... 4
DIMENSIONS .......................................................................................................................................................... 4
INSTALLATION RECOMMENDATIONS ................................................................................................................. 5
POWER SUPPLY .................................................................................................................................................... 5
RS485 ...................................................................................................................................................................... 5
USB INTERFACE .................................................................................................................................................... 5
AC INPUTS .............................................................................................................................................................. 6
USING CURRENT TRANSFORMERS AND VOLTAGE TRANSFORMERS ..................................................... 7
MEASUREMENT OF FREQUENCY AND POWER FACTOR ........................................................................... 8
4-20 MA OUTPUT .................................................................................................................................................... 8
0-10 V OUTPUT ....................................................................................................................................................... 9
INDICATOR LIGHTS (LEDS) ............................................................................................................................................ 10
USB DRIVER INSTALLATION .......................................................................................................................................... 11
DEFINITION AND SELECTION OF SERIAL PORT (COM) - WINDOWS ......................................................................... 15
CONFIGURATION SOFTWARE ....................................................................................................................................... 16
MODBUS COMMANDS AND REGISTERS TABLE .......................................................................................................... 17
READ HOLDING REGISTERS – 03H ................................................................................................................... 17
WRITE SINGLE REGISTER – 06H ....................................................................................................................... 17
WRITE MULTIPLE REGISTERS – 16H ................................................................................................................. 17
REGISTERS 20 TO 28 – MEASUREMENT VALUE IN INTEGER FORMAT ........................................................ 17
REGISTERS 200 AND 201 – SERIAL NUMBER ................................................................................................... 18
REGISTER 202 – FIRMWARE VERSION ............................................................................................................. 18
WARRANTY ...................................................................................................................................................................... 19
NOVUS AUTOMATION 1/19
DigiRail-VA

MAIN FEATURES

The DigiRail-VA is a transmitter and signal conditioner related to alternating current (single-phase), capable of measuring the following quantities on the True- RMS:
• Voltage
• Current
• Active, reactive and apparent power
• Frequency
• Power Factor
The measured values can be read through its RS485/Modbus RTU interface, in addition to being transmitted simultaneously using the 4-20 mA or 0-10 V outputs.
These features make the DigiRail-VA a great solution for measuring AC values in single-phase m achines and facilities.
This product is not intended for commercial measurement of electrical energy!
NOVUS AUTOAMTION 2/19

SPECIFICATIONS

Power Supply: 10 to 40 Vdc. Typical consumption: 50 mA @ 24 V. Operation Temperature: 0 to 60 °C. Dimensions: 99.5 x 114.0 x 17.5 mm Weight: 96 g Enclosure: PA66, with metallic attachment for 35 mm DIN track. Internal protection against polarity inversion of the power supply voltage. Wire gauge: AWG 28 to 12. Recommended torque: 4 kgf·cm. Voltage input range: 0 to 300 Vac (RMS). Current input range: 0 to 5 Aac (RMS). Frequency input range: between 45 to 65 Hz. Analog outputs: 4-20 mA and 0-10 V. Analog outputs retransmission zoom: 10:1. A bigger zoom is allowed, but with accuracy loss. RS485 Serial Interface: Modbus RTU Protocol – 3 wires. The inputs are isolated from the outputs and communication interfaces. Isolation: 2500 Vac / 1 minute. Accuracy:
DigiRail-VA
• Reading by RS485
o RMS voltage, RMS current, active power (real), apparent power and reactive power: 0.25% (True- RMS). o Power factor and frequency: 0.5 %.
• Reading by the 4-20 mA output
o RMS voltage, RMS current, active power (real), apparent power and reactive power: 0.5% (True- RMS). o Power factor and frequency: 1.0 %.
• Reading by the 0-10 V output
o RMS voltage, RMS current, active power (real), apparent power and reactive power: 0.5% (True- RMS). o Power factor and frequency: 1.0 %.
NOVUS AUTOAMTION 3/19

INSTALLATION AND OPERATION

MECHANICAL INSTALLATION

The DigiRail-VA housing was designed for installation on DIN rail 35 mm. For installation on the rail, you should locate the clamp at the base and press it against the track.

DIMENSIONS

DigiRail-VA
Fig. 01 – Dimensions of the DigiRail-VA

ELECTRICAL INSTALLATIONS AND OPERATION

The DigiRail-VA has connectors for the power supply, for the inputs for AC measurement, for the output for analog transmission and for the RS485 serial communication interface. Furthermore, it has a USB mini-B interface.
Fig. 02 - Connection terminals of DigiRail-VA.
Fig. 03 illustrates the electrical connection terminals. Terminals 4, 5 and 6 connect to the RS485/Modbus interface.
Terminals 7, 8 and 9 are intended for the analog outputs of the device (4-20 mA and 0-10 V – they share the same "negative" terminal). Terminals 10, 11 and 12 are used to power the DigiRail-VA (terminals 10 and 11 are interconnected internally).
Terminals 1, 2 and 3 are used for AC measurements and must be connected carefully. Refer to "AC Inputs" section for connection details.
Fig. 03 – Electrical connections of the DigiRail-VA
NOVUS AUTOAMTION 4/19
DigiRail-VA
D0 D D-
A
Terminal 5

INSTALLATION RECOMMENDATIONS

We recommend using an appropriate fuse for the protection of the load to be measured.
• Input conductors should travel the system plant separately from the output and supply conductors, in grounded electrical ducts.
• The power source of the instruments should come from a network that is appropriate for the instrumentation.
• The use of RC FILTERS (47 Ω and 100 nF, in series) parallel to the contactor coils and solenoids that are near or
connected to the equipment is recommended.
• In control applications, it is essential to consider what can happen when any part of the system fails.
• Section of used wires: minimum gauge of 0,14 mm².

POWER SUPPLY

The terminals 11 and 12 (or 10 and 12) are intended for the power supply for DigiRail-VA. The polarity of the power supply must be carefully observed and the voltage level.

RS485

The RS485 interface of DigiRail-VA has terminals for 3-wire communication (including the common) and operates as a Modbus RTU slave. The commands and the table of available registers can be viewed in the "Modbus Commands and Register´s Table".
This interface can be configured to operate in the following baudrate: 1200, 2400, 4800, 9600, 19200, 38400, 57600 and
115200. In addition, it can be configured to operate with one or two stop bits, and parity even, odd or none.
More details on the implementation of a Modbus network via RS485 can be found in "Basic Concepts of RS485 and RS422"; available on the CD that accompanies the product.
D1 D D+ B
C
GND
Two way data line. Inverted two way data line.
Optional connection that improves the communication performance.
Terminal 4
Terminal 6

USB INTERFACE

The DigiRail-VA has a USB device interface, used for configuration and monitoring. The Windows® operating system will detect the device as a virtual serial port, allowing the use for supervisory software (SCADA).
To acc ess this interface should be use the USB cable supplied with the equipment. When you first access, you need to install the USB drivers on the computer. To see how to do this, see "Installing the USB Driver" section.
The communication of this interface is by the Modbus RTU protocol. The commands and the table of available registers of this interface can be viewed in the "Modbus Commands and Register´s Table".
NOVUS AUTOAMTION 5/19
DigiRail-VA

AC INPUTS

The measurement circuit is electrically isolated from the rest of the equipment (power circuits and interfaces). However, great care must be taken with electrical wiring connections (see section "Electrical Installation"). Take care to comply with the maximum voltage and current set (see "Technical Specifications"). To measure higher voltages or current levels to be measured, you should use current or voltage transformers (see section "Using current transformers and voltage transformers").
The current measurement is done by an internal shunt resistor, so that the DigiRail-VA is connected in series with the load to be measured. The following figure illustrates the device connected to the measuring circuit.
Fig. 04 – Measurement of voltage and current
Despite being common simultaneous measurement of voltage and current, you can connect just the part on the voltage or current for measurement. In such cases, the measurement of the variable not connected will present value near zero as the calculated values of the side variables (power and power factor). The figures below illustrate the connections in these cases.
Fig. 05 – Solely measurement of voltage
NOVUS AUTOAMTION 6/19
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