SNV Engineering SNV018EC.XX Manual de funcionamiento

SNV018EC.XX

Current Measurement Card family

User and Installation Manual

SNV Engineering LTD

24B Papadiamantopoulou Street • 1st floor

Ilissia • Athens • Greece • 11528

Phone +30 2107779260 • Fax +30 2107703223

Site: www.snveng.gr

Action

Name

Function

Date

Signature

Written by:

Georgiadis Thanos

Engineer

15/05/2011

Verified by:

Vaidakis Michael

General Director

18/01/2012

Verified by:

Indices

Date

Modification

V1.0

18/07/2011

Initial Draft Version.

V2.0

02/11/2011

New sections added.

V3.0

09/01/2012

New template format and minor adds.

V3.1

18/01/2012

Card power consumption

This document and the information it contains are the sole property of SNV. They shall not be

disclosed nor reproduced without the prior written approval of SNV as originator.

Document Follow-up..................................................................................ii

Versions...................................................................................................ii

Table of Contents ....................................................................................... i

Card Specifications .................................................................................... 1

System overview .....................................................................................1

Specifications...........................................................................................3

Electrical.....................................................................................3

Physical & Environmental Characteristics..................................3

Measurement Characteristics.....................................................4

Communications and bus Characteristics..................................4

Card Description........................................................................................ 5

Ordering Information ..............................................................................7

Card Installation ........................................................................................ 8

System overview .....................................................................................8

Inspection and handling ........................................................................10

Preparation............................................................................................10

Card mounting and support......................................................10

Housing preparation .................................................................11

Current measurement channel protection................................11

Connectors plug preparation....................................................11

Installation.............................................................................................12

Safety....................................................................................................... 17

Safety instructions.................................................................................17

Safety Symbols ......................................................................................18

Card Operation........................................................................................ 19

Modbus Memory Map ..........................................................................19

MODBUS Functions ...............................................................................26

Technical Assistance................................................................................ 32

Annex A –Drawings ................................................................................ 33

Annex B –Bus Termination and Bias Resistors ....................................... 39

S N V 0 1 8 E C . X X

U S E R & I N S T A L L A T I O N M A N U A L

V 3 . 1

The SNV018EC card is a DC current measurement & monitor card with an

additional sense input. It is designed to be used in systems where the current

monitoring is necessary, for example it can be used in photovoltaic parks with

central inverters in order to monitor string currents.

The SNV018EC card is manufactured in four versions of 8, 12, 16 or 24 channels of

DC current measurement.

The SNV018EC offers the following:

8, 12, 16, 24 isolated channels of dc current measurement

(common low side)

0-13.5A measurement ranges (other ranges are available on demand)

Very Low Sensing resistance on measurement channels: 10mΩ

Measurement channels voltage up to 1000Vdc

1kHz sampling per channel

1 contact input

Board temperature measurement

On board long time averaging and integrations

Communication using MODBUS over RS485

Up to 127 cards connected in series

Board power consumption < 1.5W

Operating temperatures : -20°C to +60°C

CE: EMC: EN61326-1 and Safety: EN61010-1

Figure 1: SNV018EC.24 Card

S N V 0 1 8 E C . X X

U S E R & I N S T A L L A T I O N M A N U A L

V 3 . 1

The card offers 8, 12, 16 or 24 channels of DC current measurement. Low side

terminal is common, hence, card is suitable for high side measurement

(connecting positive cable to the card). Current measurement terminals are

isolated from power supply and bus terminals.

In order to perform the measurements, low thermal drift, shunt resistors are

used. Voltage on them is amplified through precision amplifiers and then sampled

and processed by a 32bit CORTEX-M3 microcontroller at 96MHz.

Figure 2: CMC SNV018EC Functional Diagram.

The microcontroller can deliver measurements through a serial RS485 transceiver

using Modbus protocol. It can also hold values, in order to perform simultaneous

measurements through all the cards in a bus and then retrieve all the

measurements. The microcontroller is also calculating the average of the currents

and of their square, with 1kHz sampling for each channel. The averaging period is

indicated-marked by a master controller broadcast command. Averaged values of

different cards are synchronized and then collected. Bandwidth consumption on

the bus is limited, giving the ability for a prompt response of the rest requests.

An additional input is also implemented to monitor a switch or a sensor acting as

a switch (ex. surge protection, door opening etc.).

Board temperature is also measured and provided.

S N V 0 1 8 E C . X X

U S E R & I N S T A L L A T I O N M A N U A L

V 3 . 1

Electrical

note

min

nom

max

Unit

Power supply

V dc

Consumption:

24V DC –0A all 24 channels

24V DC –13.5A all 24 channels

18V DC –0A all 24 channels

18V DC –13.5A all 24 channels

18V DC –16A all 24 channels

Note 1,

Abs Max

Measurement channel

resistance

each

mOhm

Channel maximum current

-16

Channel max working voltage

Note 3

1000

V dc

Current measurement range

Note 4

0.035

13.5

Note 1: The value is for each installed board

Note 2: The maximum number of cards to be installed in series is 127.

Note 3: Maximum working voltage 1000VDC for pollution degree 1. For pollution degree

2 the maximum working voltage is 800VDC.

Note 4: For software version > 2.1 values lower than 35mA are pulled down to zero

Physical & Environmental Characteristics

Details

Operating Temperature

-20 °C to +60 °C

Storage Temperature

-40 °C to +100 °C

Board Dimensions

08 channels: 165x100 mm

12 channels: 201x100 mm

16 channels: 237x100 mm

24 channels: 309x100 mm

See mechanical Specifications in ANNEX A

EMC –Emissions

Meets: EN 61326-1,

EN 61000-6-3, EN 50081-1, EN 55011

(Class B ITE: domestic environment)

EMC –Immunity

Meets: EN 61326-1, EN 50082-1,

EN61000-4-3 (Radiated EM fields immunity)

EN61000-4-4 (Fast transient burst (EFT))

EN61000-4-5 (Surges)

EN61000-4-6 (Conducted EM fields immunity)

Also successfully tested (Criterion A) at

Conducted immunity at 10Vrms, and Radiated

immunity at 10V/m (instead of 3Vrms and 3V/m

required from the above standards)

Safety

Meets EN 61010-1

Measurement Category

RATED CLASS I and RATED TRANSIENT

OVERVOLTAGES 1,5KV

Usage

Indoor or outdoor use installed

in a metallic and/or plastic box

S N V 0 1 8 E C . X X

U S E R & I N S T A L L A T I O N M A N U A L

V 3 . 1

Measurement Characteristics

Maximum averaging time

15 days at 1kHz sampling

Measurement Accuracy

±1% of measurement current

ADC resolution (12bit)

3.3mA

Thermal Drift on board

compensated (Note 5)

0.04‰ / °C

Calibration current

at 5.5 A

Note 5: Compensation, even for averaged values, is performed before value

transmission using actual board temperature, measured by the on board

temperature sensor. Long time averaging with large temperature variations

could produce thermal drifts on the transmitted values respectively.

Communications and bus Characteristics

Hardware layer

RS485

Communication Protocol

Modbus RTU

Default baudrate

9600 bps

Max number of nodes

128

Max suggested cable length

1200 m

Protected from Overvoltage Line Faults up to

±60V

Clamp diodes (A and B to GND)

±30V

Bus Short-Circuit Protection

Yes

S N V 0 1 8 E C . X X

U S E R & I N S T A L L A T I O N M A N U A L

V 3 . 1

The card is separated in two main areas (see figure 3).

The one (left) is dedicated to the measurement of the current passing through the

card. This area is a high voltage area, where signals up to 1000Vdc exist.

CAUTION

To the card will be connected high voltage signals (up to 1000Vdc)

The operation and installation of the card is considered to be done from

qualified personnel

The high side is connected to current input channels 1 –8, 12, 16 or 24, so that

the current flows as shown in figure 3, to the current channels common terminal.

The other area (right) is the low voltage area. The Modbus interface and card

power supply are connected to this area. The low voltage area is protected

through a F1, 1A fuse (P/N: SF-1206F100-2)

The low voltage and high voltage areas are separated by an isolation area.

Figure 3: CMC SNV018EC Topology Diagram.

The CMC SNV018EC uses the connectors CON1/CON2 and CON3/CON4 to connect

to the bus .and power supply (see table 1).

These connectors are equivalent (terminals are common) and can be used as

bus/power supply input or output to the next card in the chain.

Connector CON6 has two pins which are dry contacts. The connector CON6 is used

to monitor a switch or a sensor acting as a switch (ex. surge protection, door

opening etc.).

S N V 0 1 8 E C . X X

U S E R & I N S T A L L A T I O N M A N U A L

V 3 . 1

CAUTION

At the connectors CON1/CON2, CON3/CON4 and CON6 should be connected

only to safety extra low voltage systems.

The connections for the connectors CON1/CON2, CON3/CON4 and CON6 are

listed in the table 1.

Connector

Pin Number

Description

Comments

CON6

Pin 1

Pin1

Dry contact input

Pin 2

Pin2

CON3/CON4

Pin 4

BUS A

TxD+/RxD+

Pin 3

BUS B

TxD-/RxD-

Pin 2

VCC

24Vdc

Pin 1

GND

Ground

CON1/CON2

Pin 4

BUS A

TxD+/RxD+

Pin 3

BUS B

TxD-/RxD-

Pin 2

VCC

24Vdc

Pin 1

GND

Ground

Table 1: CMC Connectors Description

The connector plugs used are equivalent to the ones listed in the following table:

Connector Ref

Manufacturer

Manufacturer P/N

For CON1/CON2

Weidmüller

BL 5.08/04/180 SN or BX

For CON3/CON4

Weidmüller

BL 5.08/04/180 SN or BX

For CON6

Weidmüller

BL 5.08/02/180 SN or BX

Table 2: CMC Connectors Description

S N V 0 1 8 E C . X X

U S E R & I N S T A L L A T I O N M A N U A L

V 3 . 1

Listed below are part numbers for the Current Measurement Card SNV018EC and

available accessories.

Item

Part Number

CMC SNV018EC

SNV018EC.XX

Common bar conductor

(according to drawings, see ANNEX A)

SNV018.XX.0020

Mounting bar, current terminals

(according to drawings, see ANNEX A)

SNV018.XX.0021

Mounting bar, common terminals

(according to drawings, see ANNEX A)

SNV018.XX.0022

Bolt Holding Bar

(according to drawings, see ANNEX A)

SNV018.XX.0023

Table 3: CMC ordering information

Where XX should be filled according to the table below:

Channels Number

8 Channels

12 Channels

16 Channels

24 Channels

Table 4: Channel indicators

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