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Daikin EWLP030KBW1N [14/20] Bms connection modbus
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Operation manual
13
EWLP012~065KBW1N
Condenserless water-cooled water chillers
4PW61666-1A – 2012.04
Locking the controller keyboard
Once user parameter h09 is set to 0, the following advanced
features can no longer be carried out by means of the controller:
■ modifying direct and user parameters (parameters can be
displayed but not modified),
■ resetting the timers.
■ switching the unit on/off in cooling or heating
When user parameter h09 is set to 1, the above-described
advanced features can be carried out using the controller.
To modify user parameter h09 value from 1 to 0, the standard user
parameter modification procedure can be used with the standard
password "22". Refer to "How to consult and modify the user
parameters" on page 11.
To modify user parameter h09 value from 0 to 1, the user
parameter modification procedure can be used with dedicated
password "11". Refer to "How to consult and modify the user
parameters" on page 11.
BMS CONNECTION MODBUS
By installing the optional kit address card EKAC10C, you will be able
to communicate with your chiller through a Building Management
System or supervisory system via the Modbus protocol.
General description of Modbus
The address card communicates using the Modbus protocol.
Different parts of the communication network
■ The communication network consists of two major players:
■ The Building Management System (BMS) or supervisory
system.
■ The chiller or multiple chillers.
■ The BMS or other supervisory system is able to communicate
with the chillers through the address card.
The management of the communication occurs in accordance
with a master-slave structure in polling, where the supervising
BMS is the master and the address cards are the slaves.
■ The chiller unit can be identified by the supervisor through the
assignment of an address within the Modbus network. The
address of the chiller unit can be programmed during the
configuration of the BMS settings.
■ The variables database of every chiller with installed address
card is the point of reference for the supplier of the supervisory
system in Modbus to assign a suitable meaning to the variables.
The variables can be read and/or written by the supervisory
system. Whether the variables are read-only or read/write
depends on the connected chiller and/or the application program
being used.
- If the supervisory system assigns a value to a variable with
read-only status, the command will not be executed at all.
- Variables requested by the supervisory system that are not
available in a chiller with an address card are sent from the
address card to the supervisory system with zero value. The
supervisory system will have to manage these properly.
- In case the supervisory system tries to write a value of a
parameter that is out of range, the writing will be ignored.
General information about the Modbus protocol
The Modicon Modbus protocol implemented in the address card
complies with the content of the following document:
Modicon Modbus Protocol
Reference Guide
June 1996, PI-MBUS-300 Rev. J
The Modbus protocol implemented is of the RTU (Remote Terminal
Unit) type based on character tranmission times. The configuration
uses the multi-drop feature of RS485. The address sent within the
Modbus packet addresses the chiller unit.
Implemented RS485 communication settings for the Modbus
protocol
The RS485 communication settings are implemented as follows:
■ Baud-rate: 9600
■ Stop bit: 2
■ Parity: none
Implemented commands for the Modbus protocol
The implemented commands in the program are as listed:
Note that:
■ Due to the variety of chillers with installed address cards, no
distinction is made between input variables (with read-only
status) and output variables (with read/write status) so that the
knowledge of the database and its management depends on the
part present on the supervisory system.
■ Due to the general nature of the system, the address card
answers in the same way to various Modbus commands.
Modbus command Meaning Notes
01 read coil status Read digital
variable(s)
obtains current status (ON/
OFF) of a group of logic coils
or discrete input
02 read input
status
Read digital
variable(s)
obtains current status (ON/
OFF) of a group of logic coils
or discrete input
03 read holding
registers
Read analogue
variable(s)
obtains current binary value
in one or more holding
registers
04 read input
registers
Read analogue
variable(s)
obtains current binary value
in one or more holding
registers
05 force single coil Write individual
digital variable(s)
forces single coil to ON or
OFF status
06 preset single
register
Write individual
analogue variable(s)
places a specific binary
value into a holding register
15 force multiple
coils
Write series of
digital variables
forces a series of
consecutive logic coils to be
defined to ON or OFF status
16 preset multiple
registers
Write series of
analogue variables
places specific binary values
into a series of consecutive
holding registers
Содержание
- Condenserless water cooled water chillers 1
- Operation manual 1
- Introduction 2
- Ntroduction 2
- Operation manual 2
- Electrical specifications 3
- Electrical specification 3
- Technical specifications 3
- Technical specification 3
- 14 15 16 4
- Description 4
- Escription 4
- Figure main components 4
- The ewlp condenserless water cooled water chillers are available in 7 standard sizes 4
- Function of the main components 5
- Safety devices 5
- Internal wiring parts table 6
- Before operation 7
- Checks before initial start up 7
- Digital controller 7
- Efore operation 7
- General recommendations 7
- Operation 7
- Peration 7
- Power supply connection and crankcase heating 7
- User interface 7
- Water supply 7
- Adjusting the cooling temperature setpoint on page 8 8
- Consulting actual operational information on page 9 8
- Direct and user parameters 8
- Each parameter is defined by a code and a value for example the parameter used to select local or remote on off control has code h07 and value 1 or 0 8
- Example the leds f and g are displayed when accessing a parameter group or when accessing parameters directly 8
- For an overview of the parameters refer to overview of the direct and user parameters on page 10 8
- Function during main display not inside menu 8
- Keys provided on the controller 8
- Leds provided on the controller and remote interface 8
- Legibility of the numeric display may decrease in direct sunlight 8
- Resetting alarms on page 9 8
- Resetting warnings on page 9 8
- Switching the unit on on page 8 and switching the unit off on page 8 8
- Temperature readout tolerance 1 c 8
- The digital controller provides direct and user parameters the direct parameters are important for the everyday usage of the unit e g to adjust the temperature setpoint or to consult actual operational information the user parameters on the contrary provide advanced features such as adjusting time delays 8
- The function carried out when the user presses one or a combination of these keys depends on the status of the controller and the unit at that specific moment 8
- This chapter deals with the everyday usage of the ewlp units here you will learn how to perform routine tasks such as 8
- When selecting a parameter group or parameter different leds related to the parameter group or parameter are displayed 8
- Working with the units 8
- Adjusting the cooling temperature setpoint 9
- How to consult and modify the direct parameters 9
- How to consult the sensor readout menu parameters 9
- Switching the unit off 9
- Switching the unit on 9
- Consulting actual operational information 10
- Resetting alarms 10
- Resetting warnings 10
- Advanced features of the digital controller 11
- Overview of the direct and user parameters 11
- The list of direct parameters is accessible by pressing the b key for approximately 5 seconds refer also to how to consult and modify the direct parameters on page 8 11
- This chapter gives an overview of the direct parameters and user parameters provided by the controller in the following chapter you will learn how you can set up and configure the unit using these parameters 11
- Defining the cooling temperature differential 12
- Defining the heating temperature differential 12
- How to consult and modify the user parameters 12
- Defining the measurement unit 13
- Defining the time delay between pump and compressor startup 13
- Defining the time delay between unit and pump shutdown 13
- Defining the timer threshold for maintenance warning 13
- Selecting dual setpoint control 13
- Selecting local or remote cool heat control 13
- Selecting local or remote on off control 13
- Bms connection modbus 14
- Connection modbus 14
- Different parts of the communication network 14
- General description of modbus 14
- General information about the modbus protocol 14
- Implemented commands for the modbus protocol 14
- Implemented rs485 communication settings for the modbus protocol 14
- Locking the controller keyboard 14
- 0 for off 15
- 1 for on 15
- Activating the modbus protocol 15
- All digital variables are assigned to bits of consecutive registers each one having 15
- Analogue and integer data an analogue and integer value is represented by a 16 bit word register in binary notation for each register the first byte contains the high order bits and the second byte contains the low order bits 15
- Data representation of the modbus protocol 15
- Defining the bms setting 15
- Defining the bms setting 15
- Defining the unit s serial address 15
- Digital all digital data is coded by a single bit 15
- For addresses of all the direct and user parameters refer to overview of the direct and user parameters on page 10 15
- Implemented error code 15
- In case the bms or supervisory system tries to write a value of a parameter that is out of range the writing will be ignored 15
- Overview of all variables which are not direct or user parameters 15
- The address card operates on registers where one register must be considered at 16 bit 15
- The analogue variables are represented in tenths for example the value 10 is transmitted as 0064h 100d for example the value 10 is transmitted as ff9ch 100d 15
- The bms or supervisory system and the chiller unit communicate through a fixed set of variables also called address numbers hereafter you will find the information you need about the digital integer and analogue variables that the bms or supervisory system can read from or write to the address card of the chiller 15
- The higher address variable assigned to the most significant bit 15
- The integer variables are transferred using the effective value for example the value 100 is transmitted as 0064h 100d 15
- The lower address variable assigned to the less significant bit 15
- The modbus protocol is activated by setting the h23 parameter to 1 15
- This is a user parameter refer to how to consult and modify the user parameters on page 11 15
- To define each unit s unique serial address required for communication with the supervisionary system set parameter h10 15
- Variables database 15
- Before contacting your local dealer read this chapter carefully it will save you time and money 16
- Before starting the trouble shooting procedure carry out a thorough visual inspection of the unit and look for obvious defects such as loose connections or defective wiring 16
- Roubleshooting 16
- This section provides useful information for diagnosing and correcting certain troubles which may occur in the unit 16
- Troubleshooting 16
- When a safety device was activated stop the unit and find out why the safety device was activated before resetting it under no circum stances safety devices may be bridged or changed to a value other than the factory setting if the cause of the problem cannot be found call your local dealer 16
- When carrying out an inspection on the supply panel or on the switch box of the unit always make sure that the circuit breaker of the unit is switched off 16
- Aintenance 17
- Disposal requirements 17
- Important information regarding the refrigerant used 17
- Maintenance 17
- Maintenance activities 17
- Annex i 18
- Saturated temperature 18
- Menu overview 19
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