CIRCUTOR ReadWatt User Manual

Impulse sensor

ReadWatt

INSTRUCTION MANUAL

(M018B01-03-14B)

ReadWatt

2

Instruction Manual

ReadWatt

SAFETY PRECAUTIONS

Follow the warnings described in this manual with the symbols shown below.

DANGER

Warns of a risk, which could result in personal injury or material damage.

ATTENTION

Indicates that special attention should be paid to a speci c point.

If you must handle the unit for its installation, start-up or maintenance, the following should be taken into consideration:

Incorrect handling or installation of the unit may result in injury to personnel as well as damage to the unit. In particular, handling with voltages applied may result in electric shock, which may cause death or serious injury to personnel. Defective installation or maintenance may also lead to the risk of  re. Read the manual carefully prior to connecting the unit. Follow all installation and maintenance instructions throughout the unit’s working life. Pay special attention to the installation standards of the National Electrical Code.

Refer to the instruction manual before using the unit

In this manual, if the instructions marked with this symbol are not respected or carried out correctly, it can result in injury or damage to the unit and /or installations.

CIRCUTOR, SA reserves the right to modify features or the product manual without prior noti cation.

DISCLAIMER

CIRCUTOR, SA reserves the right to make modi cations to the device or the unit speci ca-

tions set out in this instruction manual without prior notice.

CIRCUTOR, SA on its web site, supplies its customers with the latest versions of the device speci cations and the most updated manuals.

www.circutor.com

Instruction Manual

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ReadWatt

REVISION LOG

Table 1: Revision log�

Date Revision Description

03/14 M018B01-03-14A Initial Version

04/14 M018B01-03-14B Changes : Points 3.4, 4.3.4 and 5

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ReadWatt

1�- VERIFICATION UPON RECEPTION

Check the following points when you receive the unit:

a) The unit meets the specications described in your order. b) The unit has not suffered any damage during transport. c) Perform an external visual inspection of the unit prior to switching it on. d) Check that it has been delivered with the following:

- A Velcro strap to attach the unit to the energy meter with impulse emitter,

- A connection cable,

- A CD.

If any problem is noticed upon reception, immediately contact the transport company and/or CIRCUTOR's after-sales service.

2�- PRODUCT DESCRIPTION

ReadWatt is an impulse sensor that can be attached to an energy meter verication impulse

emitter so that, through a MODBUS RTU protocol, there is an energy totaliser with the same accuracy as the meter itself, but without physical access being necessary.

The unit features:

- 1 impulse indicator LED.

- 1 impulse output.

- RS-232 communications with MODBUS RTU protocol.

- RS-485 communications with MODBUS RTU protocol.

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Instruction Manual

ReadWatt

3�- UNIT INSTALLATION

3.1.- PRIOR RECOMMENDATIONS

In order to use the unit safely, it is critical that individuals who handle it follow the safety measures set out in the standards of the country where it is being used, use the necessary personal protective equipment, and pay attention to the various warnings indicated in this instruction manual.

The ReadWatt unit must be installed by authorised and qualied staff.

The power supply plug must be disconnected before handling, altering the connections or replacing the unit. It is dangerous to handle the unit while it is powered.

Also, it is critical to keep the cables in perfect condition in order to avoid accidents, personal injury and damage to installations.

The manufacturer of the unit is not responsible for any damage resulting from failure by the user or installer to heed the warnings and/or recommendations set out in this manual, nor for damage resulting from the use of non-original products or accessories or those made by other manufacturers.

If an anomaly or malfunction is detected in the unit, do not use it to take any measurements.

Inspect the work area before taking any measurements. Do not take measurements in dangerous areas or where there is a risk of explosion.

Disconnect the unit from the power supply (unit and measuring system power supply) before maintaining, repairing or handling the unit's connections. Please contact the after-sales service if you suspect that there is an operational fault in the unit.

The installation where the unit is connected must have an earthing and the DC ripple voltage of the power supply cannot exceed 10%.

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ReadWatt

3.2.- INSTALLATION

The unit is installed on the energy meter.

The rst step for installing ReadWatt is to separate the two parts of the Velcro strap. Take one of them, remove the protective paper and stick the adhesive part of the Velcro strap to the rear of the unit ( Figure 1).

Figure 1: Stick part of the Velcro strap to the rear of the READWATT�

Remove the protective paper from the other part of the Velcro strap and stick the adhesive part to the optical port of the billing meter (Figure 2).

Figure 2: Stick a part of the Velcro strap to the optical port of the meter�

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Instruction Manual

ReadWatt

Now simply place the ReadWatt on the energy meter's Velcro strap (Figure 3).

Figure 3: ReadWatt installed�

Finally, connect the cable delivered with the unit to the ReadWatt's RJ45 connector.

Figure 4: Cable connection�

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3.3.- UNIT TERMINALS

The unit has a RJ45 connector with the following list of terminals (Table 2):

Table 2:List of ReadWatt terminals�

Unit terminals

1: GND 5: B(-), RS-485

2: Rx, RS-232 6: GND

3: Tx, RS-232 7: Pulse output

4: A(+), RS-485 8: Vdc, Auxiliary power supply.

ReadWatt

Figure 5: ReadWatt RJ45 Connector�

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Instruction Manual

ReadWatt

3.4.- CONNECTION DIAGRAM

3�4�1�- RS-485 CONNECTION

Use an intelligent RS-232 to RS-485 network protocol converter to establish the communications with the master unit ( Figure 6).

3

PC

5

2

Alimentación

Power Supply

-

+

B

A

(+)

(-)

RS-232

2 53

ReadWatt

1

2

RS-485

B(-)A(+)

A(+)

Alimentación

Power Supply

B(-)

Instruction Manual

Figure 6: RS-485 Connection diagram�

11

3�4�2�- PULSE OUTPUT CONNECTION

ReadWatt

A

B

+VCC

R

7

6

+VCC

7

IN

COMMON

6

Figure 7: Pulse Output connection�

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Instruction Manual

ReadWatt

4�- OPERATION

ReadWatt reads the light impulses from the meter, whose value is shown in real time on a MODBUS parameter, which can be queried by another application.

The unit reads kWh consumed or generated and totalizes them in the MODBUS meter, which works incrementally, being able to generate, for example, a load curve in external software.

4.1.- IMPULSE LED

The unit has an impulse LED with the same rate as the LED on which impulses are captured. This safeguards the functionality of the meter's LED. This LED has the same metrological validity as the meter's LED.

LED

Figure 8:Readwatt LED indicators

During start-up, the LED indicates the speed of the communication bus, by emitting 1, 2 or 3 light impulses, see Table 3.

Table 3: Communication bus speed�

No� of pulses Speed

1 9600 bauds

2 19200 bauds

3 38400 bauds

4.2.- IMPULSE OUTPUT

The unit has a transistor output (terminal no. 7 in Table 2) to activate PLC or similar inputs. Through MODBUS it is possible to congure the impulse width and ratio between output impulses and impulses read from the energy meter verication LED.

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ReadWatt

4.3- COMMUNICATIONS

ReadWatt has two communications ports, RS-232 and RS-485. Both ports can be used simultaneously.

The transmission speed, Baudrate, is the same for both ports and can be congured.

4�3�1�- MODBUS PROTOCOL

The MODBUS protocol is a communication standard in the industry that enables the network connection of multiple units, where there is a master and multiple slaves. Within the MODBUS protocol ReadWatt uses the RTU (Remote Terminal Unit) mode.

In RTU mode the start and end of the message is detected with silences with a minimum of 3.5 characters and the 16-bit CRC error detection method is used.

The MODBUS functions implemented in the unit are:

Functions 03 and 04. Reading of logs.

Function 10. Writing of multiple logs.

4�3�2�- READ COMMANDS

ReadWatt supports the integer type read functions: 0x03 and 0x04. The unit's MODBUS variables are specied in Table 4.

Example: Reading of the unit's serial number with peripheral number 01.

We will send the following MODBUS frame:

Address

01 04 0060 0002 CRC

Func-

tion

Initial log Log no� CRC

The unit will respond to us with the next frame:

Address

01 04 04 XXXX XXXX CRC

Func-

tion

No� of

bytes

Serial no� CRC

14

Note: The values are shown in hexadecimal.

The number of requested logs must be the same as the size of the variable requested. It is possible to read several consecutive addresses, if the request meets the correct format.

Instruction Manual

ReadWatt

4�3�3�- WRITE COMMANDS

ReadWatt supports the integer type write functions: 0x10. The unit's MODBUS variables are specied in Table 4.

Example: Changing the MODBUS address of peripheral 01 to the address 0x000A.

We will send the following MODBUS frame:

Address

01 10 0008 0001 02 000A CRC

Func-

tion

Initial log Log no� No� bytes Data CRC

The unit will respond to us with the next frame:

Address

01 10 0008 0001 CRC

Func-

tion

Initial log Log no� CRC

Note: The values are shown in hexadecimal.

The number of logs to write must be the same as the size of the variable that is being accessed. It is possible to write several consecutive addresses, if the request meets the correct format.

4�3�4�- MODBUS VARIABLES

Table 4: Readwatt MODBUS variables�

Description

Modbus Address 0x0008 16 bits Read/Write 10

Transmission speed

(Baudrate)

Serial no. 0x0060 32-bit Read -

Maximum width of impulses in ms 0x0106 16 bits Read/Write 250 ms

Minimum width of impulses in ms 0x0107 16 bits Read/Write 2 ms

No. of input impulses per output

impulse

Ratio between input impulses and

kWh (kvarh)

Transformation ratio

Output impulse width in ms 0x010B 16 bits Read/Write 100 ms

Impulse log 0x0600 64 bits Read -

kWh (kvarh) log 0x0604 64 bits Read -

(1)

Address

(Hexadecimal)

0x010C 16 bits

0x0108 16 bits Read/Write 10

0x0109 16 bits Read/Write 1000

0x010A 16 bits Read/Write 1

Instantaneous values

Size Read/Write Default value

Read/Write

0: 9600

1:19200

2: 38400

0: 9600

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ReadWatt

(1)

Transformation ratio: The pulses generated by a billing meter are always associated to the secondary, so that the Conversion Ratio (Transformation Ratio) must be programmed in the case of Medium Voltage installations for transferring the secondary pulses to the real primary measurement.

Example:

Low Voltage Installation:

Forward voltage: 1/1 -- Transformation ratio = 1.

Medium Voltage Installation:

Voltage Primary

Transformation ratio = X

Voltage Secondary

Current Primary

Current Secondary

In a Medium Voltage installation, where:

Voltage Primary = 27500 V, Voltage Secondary = 110 V. Current Primary = 200 A, Current Secondary= 5 A.

Transformation ratio = 10000�

4�3�5�- SPECIAL BROADCAST COMMAND

In case the peripheral number assigned to the ReadWatt device is unknown, you have the broadcast command available (address 00). With this command you can change certain basic parameters, such as the MODBUS peripheral number or communication speed.

For this you need to know the serial number of the device you wish to access. The serial number is on the front panel of the unit (Figure 9); this number must be translated into hexadecimal language so that it can be sent in the broadcast command.

16

Serie no

( in decimal)

Figure 9: ReadWatt serial no�

It is important to remember that because it is a broadcast frame, there is no conrmation reply.

The broadcast command has the following structure:

Instruction Manual

ReadWatt

Address

Func-

tion

Initial log Log no� No� bytes Unit serial no� Data CRC

00 10 0BBA 0001 02 SSSS SSSS DDDD CRC

Note: The serial number must be hexadecimal.

The MODBUS variables for the broadcast command are specied in Table 5.

Table 5: MODBUS variables, broadcast command�

Description

Serial no. 0x0BB8 32 bits Read

Peripheral no. (Top part)

Baudrate transmission speed (Bottom part)

Address

(Hexadecimal)

0x0BBA 16 bits

Size Read/Write

Top Part:

Bottom Part:

Write

01��FF

00: 9600 bps

01:19200 bps

02: 38400 bps

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5�- TECHNICAL FEATURES

ReadWatt

Power supply

Rated voltage

Tolerance ± 5%

Consumption < 0.5 W

Memory

Setup, logs EEPROM and FRAM type non-volatile memory

User interface

LED 1 LED

Impulse output

Quantity 1

Type Open collector

Maximum voltage 24 VDC

Maximum current 50 mA

Maximum frequency 100 impulses / sec.

Pulse width 2 ms to 250 ms (Programmable)

RS-232 and RS-485 communications

Communications protocol Modbus

Speed 9600 -19200-38400

No� of bits 8

Stop bits 1

Parity without

5 V ... 24 V

Insulation

Alternating voltage 4kV RMS 50Hz during 1 minute

Overimpulse

1�2/50ms 0Ω source impedance 6 kV at 60º and 240º, with positive and negative polarization

Environmental features

Operating temperature -15ºC ... +55ºC

Storage temperature -25ºC ... +65ºC

Relative humidity (non-condensing) 5 ... 95%

Maximum altitude 2000 m

Mechanical features

Dimensions Figure 10

Enclosure Polyamide V0

Weight 14 gr.

Protection degree IP 41

Standards

Immunity for industrial environments UNE EN-61000-6-2

Emission standard for industrial environments UNE EN-61000-6-4

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Instruction Manual

ReadWatt

32.15

25.6

Figure 10: ReadWatt dimensions

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6�- MAINTENANCE AND TECHNICAL SERVICE

The unit does not need any type of maintenance.

In the case of any query in relation to unit operation or malfunction, please contact the

CIRCUTOR, SA Technical Support Service.

Technical Assistance Service

Vial Sant Jordi, s/n, 08232 - Viladecavalls (Barcelona) Tel: 902 449 459 ( España) / +34 937 452 919 (outside of Spain) email: sat@circutor.es

7�- GUARANTEE

ReadWatt

CIRCUTOR guarantees its products against any manufacturing defect for two years after the delivery of the units.

CIRCUTOR will repair or replace any defective factory product returned during the guarantee period.

• No returns will be accepted and no unit will be repaired or replaced if it is not accompanied by a report indicating the defect detected or the reason for the return.

•The guarantee will be void if the units has been improperly used or the storage, installation and maintenance instructions listed in this manual have not been followed. “Improper usage” is de ned as any operating or storage condition contrary to the national electrical code or that surpasses the limits indicated in the technical and environmental features of this manual.

• CIRCUTOR accepts no liability due to the possible damage to the unit or other parts of the installation, nor will it cover any possible sanctions derived from a possible failure, improper installation or “improper usage” of the unit. Consequently, this guarantee does not apply to failures occurring in the following cases:

- Overvoltages and/or electrical disturbances in the supply;

- Water, if the product does not have the appropriate IP classi cation;

- Poor ventilation and/or excessive temperatures;

- Improper installation and/or lack of maintenance;

- Buyer repairs or modi cations without the manufacturer’s authorisation.

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ReadWatt

8�- CE CERTIFICATE

Instruction Manual

21

CIRCUTOR, SA

Vial Sant Jordi, s/n 08232 -Viladecavalls (Barcelona) Tel.: (+34) 93 745 29 00 - Fax: (+34) 93 745 29 14 www.circutor.es central@circutor.es

CIRCUTOR ReadWatt User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

SAFETY PRECAUTIONS

DISCLAIMER

CONTENTS

REVISION LOG

1�- VERIFICATION UPON RECEPTION

2�- PRODUCT DESCRIPTION

3�- UNIT INSTALLATION

3.1.- PRIOR RECOMMENDATIONS

3.2.- INSTALLATION

3.3.- UNIT TERMINALS

3�4�1�- RS-485 CONNECTION

3�4�2�- PULSE OUTPUT CONNECTION

4�- OPERATION

4.1.- IMPULSE LED

4.2.- IMPULSE OUTPUT

4�3�1�- MODBUS PROTOCOL

4�3�2�- READ COMMANDS

4�3�3�- WRITE COMMANDS

4�3�4�- MODBUS VARIABLES

4�3�5�- SPECIAL BROADCAST COMMAND

5�- TECHNICAL FEATURES

6�- MAINTENANCE AND TECHNICAL SERVICE

7�- GUARANTEE

8�- CE CERTIFICATE