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ECA 84 M-bus Module

BC-HM VI.BA.P1.02 / 087R9588 © Danfoss A/S February 2001

Table of Contents

2 VI.BA.P1.02 © Danfoss A/S BC-HM

Table of Contents

1. INTRODUCTION ..............................................................3

1.1 Scope .....................................................................................3 1.2 About the ECA 84 M-bus Module ........................................3

2. FUNCTIONAL OVERVIEW ...........................................3

2.1 Communication .....................................................................3 2.2 Heat Meters ...........................................................................4 2.3 Input Configuration ...............................................................4

3. INSTALLATION ...............................................................5

3.1 Installing the ECA 84 module ...............................................5 3.2 Installing the Connector ........................................................6 3.3 Cabling ..................................................................................6 3.4 Installing Heat Meters ...........................................................6 3.5 Uninstalling the ECA 84 M-bus Module...............................6

4. ECL COMFORT SERVICE PARAMETERS ................7

4.1 Setting Up the ECL Comfort.................................................7 4.1.1 Setting Up the Communication...................................7 4.1.2 Setting Time Constants ...............................................8 4.1.3 Setting the Flow or Energy Reference ........................9 4.1.4 Swapping M-bus Addresses......................................10

4.2 Reading Measured Data ......................................................11

5. TROUBLESHOOTING...................................................11

5.1 What to Expect ....................................................................11 5.2 Error Conditions..................................................................12

5.2.1 Symptoms .................................................................12 5.2.2 Causes .......................................................................12

Introduction

BC-HM VI.BA.P1.02 © Danfoss A/S 3

1. Introduction

1.1 Scope

This Instruction is for the ECA 84 M-bus module for the ECL Comfort 300.

The Instruction is valid from:

• ECL Comfort 300 software version 1.08 • ECA 84 M-bus module hardware version 2.00, software version 1.00.

1.2 About the ECA 84 M-bus Module

When delivered from Danfoss A/S, the ECA 84 M-bus module package includes:

• One ECA 84 M-bus module (printed circuit board) • One cover plate for rear panel of ECL Comfort 300 • One 3-pin connector • One copy of this instruction.

Regarding the question: Which ECL Comfort 300 versions and applications sup-port the ECA 84 M-bus module (thereby permitting flow and energy limiting), please consider the following:

Flow and energy limiting will be available in all new district heating applications and will be added to relevant existing applications as they are updated or modified. Flow and energy limiting will not be available in:

• An ECL Comfort application card with card index CI 07 or lower • An ECL Comfort 300 with software version 1.07 or lower.

The heat meters with which the ECA 84 M-bus module can communicate are listed on page 4.

2. Functional Overview

The ECA 84 M-bus module enables the ECL Comfort to read measured values of flow or energy consumption from connected heat meters. The ECL Comfort can use the measured data to perform outdoor temperature dependent flow limiting or energy limiting.

! Note: When using the ECA 84 M-bus module, the ECL Comfort cannot receive flow/energy data via any other ports or slots.

2.1 Communication

When the ECA 84 M-bus module is installed, the ECL Comfort can communicate with heat meters via M-bus and/or pulse communication.

M-bus When using M-bus communication, the ECL Comfort acts as master on the M-bus. This means that other devices on the bus must be configured as slaves. ECL Com-

Functional Overview


fort communicates at 300 b/s. M-bus communication in the ECL Comfort complies with the standard DS/EN 1434-3: 1997. When using M-bus communication, the ECL Comfort can communicate with one or two heat meters on the bus.1

Pulse When using pulse communication, the ECL Comfort is connected point-to-point to one single heat meter. ECL Comfort supports voltage pulse communication in the frequency range 0 – 200 Hz. The communication of the heat meter is supplied from the ECA 84 M-bus module via a pull-up resistor. In order for the ECA 84 to detect a pulse:

• The change in voltage must be greater than 5 V • The pulse width must be greater than 1 ms.

Internal communication The ECA 84 module receives data from the communication line, performs any re-quired conversions and relays data to the ECL Comfort CPU module – and vice versa.

! Note: Exchange of data between the ECA 84 module and the ECL Comfort CPU takes place once every 30 seconds.

2.2 Heat Meters

The heat meters supported by the ECL Comfort are listed in Table 1:

Heat meter Manufacturer Communication

INFOCAL™ 5 Danfoss A/S M-bus, pulse

CALSTREEM™ type EEM-C Danfoss A/S M-bus, pulse

MULTICAL® III Kamstrup A/S M-bus, pulse

WZD4 x.xx with pulse module WZD-PC

Siemens Building Technologies, Landis & Staefa Division

Pulse

Table 1. Supported heat meters

2.3 Input Configuration

The ECA 84 M-bus module can take data input via two channels named I and II. These can be configured as indicated in Table 2:

Channel I Channel II

M-bus M-bus

M-bus Pulse

Pulse M-bus

M-bus Not used

Not used M-bus

Pulse Not used

Not used Pulse

Table 2. Input channel configurations

1 A good source of information about the M-bus is the Internet site http://www.m-bus.com.

Installation


3. Installation

3.1 Installing the ECA 84 module

To install the ECA 84 module in the ECL Comfort 300:

Figure 1. Dismounting the cover plate.

1. Dismount cover plate B on the back of the ECL Comfort using a small slice cutter.

Figure 2. Mounting the M-bus option in the ECL Comfort

2. Mount the M-bus option board in the slides and press it gently into the con-nector on the ECL Comfort’s CPU board.

Figure 3. Mounting the new cover plate

3. Mount the new cover plate B that is delivered with the option module.

Installation


3.2 Installing the Connector

Table 3 shows the pin assignment of the ECA 84’s connector.

Pin Description

1 M-bus

2 Pulse input

3 GND

Table 3. Pin assignment of the connector

! Note: The connector must be inserted into the ECL Comfort as shown in Figure 4.

Figure 4. The orientation of the connector

3.3 Cabling

Table 4 shows cable specifications for the two types of communication.

Communication Cable type Max. length Dimension

M-bus Twisted pair telephone cable – JYStY 50 m 2 x 0.8 mm

Pulse Twisted pair telephone cable – JYStY 50 m 2 x 0.8 mm

Table 4. Cable types and dimensions

3.4 Installing Heat Meters

For instructions on installing and setting up heat meters, refer to the documentation provided by the manufacturer of the heat meter.

3.5 Uninstalling the ECA 84 M-bus Module

If the need to uninstall the ECA 84 module arises:

1. Remove the connector with the cables (Figure 4).

2. Remove the cover plate.

3. Carefully detach the ECA 84 module from the ECL Comfort’s CPU board.

4. Re-install the cover plate.

ECL Comfort Service Parameters


4. ECL Comfort Service Parameters

You set up the ECL Comfort to measure/limit flow or energy by modifying the set-ting of a few of the service parameters. This section tells you which service pa-rameters must be modified. For instructions on how to set service parameters, see the appropriate ECL Comfort User’s Guide, Installation and Maintenance section (the ‘grey’ part of the Guide).

When the ECA 84 M-bus module is installed, the relevant service parameters be-come accessible via the ECL Comfort’s front panel – provided that the application card currently used with the ECL Comfort supports the limiting function (see page 3). The set-up of these parameters is described in the following. You should modify the setting of the parameters in the sequence in which they are described.

4.1 Setting Up the ECL Comfort

4.1.1 Setting Up the Communication

Parameters 115 and 114 are used to inform the ECA 84 M-bus module of the communication set-up.

Before setting up parameters, you must plan:

• Which communication channel(s) will you be using (see page 4)? • How will each communication channel be used (pulse, M-bus, not used)? • In what range will the measured flow/energy data lie? • For pulse communication: What is the significance of 1 pulse received, that is,

the amount of water or the amount of consumed energy?

In order to enable flow/energy limiting in both circuits controlled by the ECL Comfort, you must set up parameters 115 and 114 for both communication chan-nels (I and II). Communication channel I corresponds to circuit I and communica-tion channel II corresponds to circuit II.

When setting up parameters 115 and 114, you change between circuit I and II by

pressing .



Param. No.

Range Default value

Description

Parameter No. 115 determines the unit and range of the flow/energy measurement, display and reference. If pulse communication is being used, parameter 115 also determines the unit of the amount of water or energy signified by 1 pulse.

The following rows of this table explain the significance of the possible values of parameter 115:

Value Flow/energy range

Flow/energy unit

Pulse unit

Off 0 – –

1 0 – 2999 l/h ml

2 0 – 2999 l/h l

3 0.0 – 299.9 m3/h ml

4 0.0 – 299.9 m3/h l

5 0.0 – 299.9 m3/h × 10 l 6 0 –2999 m3/h m3

7 0.0 – 299.9 kW Wh

8 0.0 – 299.9 kW × 10 Wh

9 0 – 2999 kW kWh

10 0.0 – 299.9 MW kWh

11 0.0 – 299.9 MW × 10 kWh 12 0 – 2999 MW MWh

13 0.0 – 299.9 GW MWh

14 0.0 – 299.9 GW × 10 MWh

115 Off, 1 – 15

Off

15 0 – 2999 GW GWh

Param. No.

Range Default value

Description

114 Off, 1 – 999

Off Parameter 114 determines the amount of water / energy that one pulse signifies. The unit of the amount (pulse unit) is de-termined by the set-up of parameter 115 Off: Pulse communication is not being used for the channel

Example Channel I, parameter 115 = 4, parameter 114 = 200. This setting means: Channel I is being used for pulse communication of measured flow data. The flow data lies in the range 0.0 – 299.9 m3/h and 1 pulse signifies a water flow of 200 l.

Channel II, parameter 115 = 7, parameter 114 = Off. This setting means: Channel II is being used for M-bus communication of measured energy data. The energy data lies in the range 0.0 – 299.9 kW. Note: parameter 115 might also have been set to 8 – the pulse unit setting is not used in M-bus communication.

4.1.2 Setting Time Constants

When flow/energy data is received by the ECL Comfort CPU, it will apply some filtering to the received data. Limiting of flow/energy consumption takes place by integral control. For both these processes, i.e. the filtering of the received data and the integral control, the ECL Comfort needs a time constant. These time constants are determined by parameters 113 and 112, respectively.



Parameter 112 and 113 can be set for both circuit I and II. When setting parame-

ters, you change between circuit I and II by pressing .

Param. No.

Range Default value

Description

112 1 – 250 40 Parameter 112 is a time constant for integral control of flow/energy limiting. A high value of 112 means fast control, a low value means slow (more stable) control

Param. No.

Range Default value

Description

113 1 – 250 2 Parameter 113 is a time constant for digital filtering of flow/energy input data. When parameter 113 is set to 1, no filtering is applied. A high value of 113 means that a high degree of filtering is applied

4.1.3 Setting the Flow or Energy Reference

Before the ECL Comfort can perform flow/energy limiting, a reference flow or en-ergy value must be entered for each circuit where flow/energy limiting should be active. The flow/energy reference value works differently for a heat circuit and a hot-water circuit.

Heat circuit For a heat circuit (circuit I or II of the ECL Comfort), the flow/energy reference is determined indirectly by the ECL Comfort, in accordance with the actual outdoor temperature. So, for a heat circuit, the ECL Comfort performs outdoor temperature dependent flow or energy limiting. The ECL Comfort User’s Guide (‘grey’ section, Service Parameters) describes the functioning and set-up of return temperature lim-iting in a heat circuit. Flow/energy limiting works according to the same principle. The flow/energy reference is determined according to an outdoor temperature curve:

Flow or energy reference

Tout +15 –15 0

Param. 117

Param. 116

Figure 5. The principle of the flow/energy limiting

The maximum and minimum of the curve shown in Figure 5 are determined by pa-rameters 116 and 117, respectively. The corresponding x-coordinates are identical to the x-coordinates of the return temperature limiting curve. Refer to the ECL Comfort User’s Guide to see how you read the x-coordinates.



Param. No.

Range Default value

Description

116 * 2999 Parameter 116 is the maximum y-coordinate of the flow/energy limiting curve

117 * 2999 Parameter 117 is the minimum y-coordinate of the flow/energy limiting curve

* Depends on the setting of parameter 115

The calculated flow/energy reference for the heat circuit can be read in parameter 111.

Hot-water circuit For a hot-water circuit, the flow/energy reference is entered directly into parameter 111.

Param. No.

Range Default value

Description

111 * 2999 Parameter 111 is the flow or energy reference for the hot-water circuit. The unit is determined by the setting of parame-ter 115 (see page 8)


4.1.4 Swapping M-bus Addresses

This section describes a special situation that may occur when both communication channels of the ECA 84 M-bus module are used for M-bus communication.

Address Detection

Each device attached to the M-bus has a unique address in the interval 1..250.

! Note: When connecting two heat meters to the same M-bus, check the address set-up of the heat meters. If the addresses are identical, one of them must be changed.

The ECA 84 module detects the addresses of devices present on the M-bus in the following way:

When you modify the setting of parameter 115, either for circuit I or circuit II, the ECA 84 module starts broadcasting a message on the M-bus, addressed to device no. 1. If there is no answer, the ECA 84 module proceeds to send a message ad-dressed to device no. 2, etc. When the ECA 84 module receives an answer from a device on the bus, it assumes that the responding device is a heat meter and assigns this device to the circuit that you are working with at the moment, that is, either to circuit I or circuit II.

When you modify the setting of parameter 115 for the next circuit (I or II), the ECA 84 module proceeds to detect more devices on the M-bus. The next device that responds is assigned to the circuit you are working with now.

Troubleshooting


Swapping Addresses

Now, if – by a mistake during the procedure outlined above – the heat meter that should be assigned to circuit I has been assigned to circuit II and vice versa, the following service parameter solves the problem:

Param. No.

Range Default value

Description

196 0, 1 0 When parameter 196 is set to 1, the M-bus addresses of two connected heat meters are swapped. After addresses have been swapped, parameter 196 is automatically reset to 0

4.2 Reading Measured Data

You display the data read by the ECL Comfort from the attached heat meter(s) by reading parameter 110 for circuit I and II. When reading the parameter, you change

between circuit I and II by pressing .

Param. No.

Range Default value

Description

110 * 0 The actual flow or energy measurement. The unit depends on the setting of parameter 115 (see page 8)


5. Troubleshooting

5.1 What to Expect

After the ECA 84 M-bus module has been installed as described in chapter 3 and set up as described in chapter 4, the measured flow or energy data should become available in parameter 110 (circuit I and/or II), as described above. However, you must take into consideration that:

• The ECA 84 M-bus module exchanges data with the ECL Comfort’s CPU once every 30 seconds

• The process of detecting addresses on the M-bus (see page 10) may take up to 10 minutes if both communication channels are set up to M-bus.

When pulse communication is used, you may experience discrepancies between the data displayed by the heat meter and the data displayed in parameter 110 by the ECL Comfort when the flow or energy consumption is low, that is, is much lower than the reference value. This phenomenon is due to the method used by the ECL Comfort to calculate the measurement time for pulse communication.

Bear in mind, therefore, that if the data measured by ECL Comfort deviates from the values reported by the heat meter at low flow/energy values, this will not influ-ence the function of the flow/energy limiting. The ECL Comfort measures cor-rectly in the interval surrounding the reference value.

Troubleshooting


5.2 Error Conditions

5.2.1 Symptoms

Symptoms of an error condition may be:

• The ECL Comfort consistently reports 0 for parameter 110 – while the heat meter reports a different value (i.e. water flow or energy consumption is taking place).

• The value reported by the ECL Comfort deviates significantly from the value reported by the heat meter – when M-bus communication is used or, when pulse communication is used, at data values close to the flow/energy reference.

5.2.2 Causes

The cause for failure may reside in:

• The heat meter • The connection • The ECA 84 M-bus module • The ECL Comfort.

Heat meter To eliminate errors due to the functioning of the heat meter, check that the device is properly connected to the communication line (whether M-bus or pulse) and set up according to the instructions of the manufacturer.

Connection To eliminate errors due to the connection, you should:

1. Check that the cables used meet the specifications given on page 6, that they are properly connected both to the ECL Comfort and to the heat meter and that the cables themselves are without any visible sign of damage.

2. If you are using both communication channels for M-bus communication, check whether you need to swap the M-bus addresses of the heat meters. See page 11.

ECA 84 M-bus module Once the ECA 84 module is installed in the ECL Comfort, you should be able to access the service parameters described in chapter 4. If these parameters are not ac-cessible, the ECA 84 module is not communicating properly with the ECL Comfort CPU.

1. Check that the ECA 84 module is properly seated in the connector on the ECL Comfort’s CPU board (see page 5).

ECL Comfort To eliminate errors caused by the ECL Comfort:

1. Check the software version of the ECL Comfort.2 The software must be version 1.08 or later.

2. If data is being displayed (service parameter 110) but values seem incorrect, check the set-up of the ECL Comfort. See chapter 4.

2 You can see the software version of the ECL Comfort during start-up or in line 9 (yellow side of ECL card

facing outwards), lower right-hand corner. The ECL Comfort User’s Guide provides exact instructions.

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