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EWAQ340GZXR
Инструкция по эксплуатации панели управления Страница: 42

Daikin EWAQ340GZXR [42/78] Defrost control

D-EOMHP00706-14EN - 42/78

6.3.4 Defrost control

In heating mode, a unit makes frost on air heat exchanger at a certain condition. This frost may cause low

pressure alarm, less heating capacity, leak due to damage to cupper tube or something negative. So far,

when the amount of frost reaches unallowable level the chiller must do “Defrost”.

In this section three kinds of Defrost control are defined, which are “Off cycle defrost”, “Reverse cycle

defrost” and “Manual defrost”. If the circuit is in defrost control all components, which are compressors,

fans, EXV, 4way valve and solenoid valves, shall be controlled by defrost control.

Содержание

Revision history 2
Scope of applicable model s 3
Control system 14 4
General description 12 4
Revision history 2 scope of applicable model s 3 table of contents 4 1 safety considerations 9 4
Table of contents 4
Alarm 43 5
Unit availability 34 5
Unit functions 36 5
Working with this unit 23 5
Optional function 59 7
Calculations 76 8
Set point table 72 8
Avoid electrocution 9
Emergency stop 9
General 9
General safety devices 9
Safety considerations 9
Safety devices 9
Circuit safety devices 10
Component safety devices 10
Do not operate on a faulty fan before the main switch has been shut off 10
Overcurrent overload protections 10
Overtemperature protection is auto reset therefore a fan may restart automatically if temperature conditions allow it 10
Overtemperature protections 10
Phase reversal under over voltage ground fault protections 10
The emergency stop causes all motors to stop but does not switch off power to the 10
Unit do not service or operate on the unit without having switched off the main switch 10
Direct intervention on the power supply can cause electrocution burns or even death 11
Flowswitch 11
Freezing protection 11
High pressure protection 11
Low pressure protection 11
Mechanical high pressure switch 11
This action must be performed only by trained persons 11
Abbreviations used 12
General 12
General description 12
Inverter fault 12
Local mode the machine is controlled by commands from the user interface 12
Relief safety valve 12
Remote mode the machine is controlled by remote contacts volt free contacts 12
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Control system 14
Overview 14
Communication components 15
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Note x means a unit will use that component here is the sample diagram of components connection for 8 compressors unit 15
Unit will use several communication components and that will depend on how many compressors are in the unit the components to be used are defined as the following table also the diagram shown as below indicates how those modules are connected 15
All boards continuously check and indicate the proper operation of their electronic circuits a light emitting diode led lights on the uc and two additional lights on each extension board when it is operating properly 16
Application loaded but not running or bsp upgrade mode active yellow 16
Application not loaded yellow flashing with 50ms on and 1000ms off 16
Application running green 16
Bsp error software error red flashing with 2hz 16
Bsp initialization this indicates the startup and preparation of all files after this mode the final run mode bellow is active available since vvs10 16
Bsp upgrade mode in progress per second flashing between red and green 16
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Fail safe mode in case that the bsp upgrade was interrupted yellow with red flashing every second for 500ms 16
Green flashing with 50ms on and 1000ms off 16
Hardware error red 16
Light emitting diodes on boards 16
Mode led 16
Since vvs10 bsp startup phase the controller needs time for starting green flashing with 50ms on and 1000ms off 16
Uc bsp led 16
Acs i f board leds 17
Bus led 17
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Extension modules bsp led 17
There are three leds in asc i f board 17
This led indicates the status of the communication with the controller 17
Cpu com hap 18
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Rx led1 18
Tx led2 18
Available sensors 19
Compressor vfd led 19
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Other sensors 19
Pressure transducers 19
Temperature sensors 19
The evaporator water sensors are installed in the entering and leaving side an outdoor temperature sensor is mounted inside the chiller additionally each circuit installs a suction and discharge temperature sensors to monitor and control the superheated refrigerant temperatures on refrigerant cooled inverters additional sensors immersed into the cooling plate measure the temperature of the drives 19
Thermistors 19
Thermistors trip to a high value in case the motor temperature reaches a hazardous temperature 19
Two types of electronic sensors are used to measure suction discharge and oil pressure on each circuit the range of each sensor is clearly indicated on the sensor casing discharge and oil pressures are monitored using a sensor of the same range 19
Although the flow switch is offered as an optional it is mandatory to install one and connect it to the digital input terminals in order to enable chiller operation only when a minimum flow is sensed 20
Available controls 20
Compressors 20
Customer terminal block connections 20
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Evaporator pumps 20
Expansion valve 20
Flow switch 20
General description 20
The contacts below are available at the user s terminal block referred as mc24 or mc230 in the wiring diagram the following table summarizes the connections at the user s terminal block 20
The controller can regulate an electronic expansion valve per each refrigerant circuit microtech iii embedded logic will always guarantee the best operation for the refrigerant circuit 20
The controller can regulate maximum twelve compressors installed on one or two independent refrigerant circuit maximum six compressors per circuit all the safeties of each compressor will be managed by the controller embedded inverter safeties are handled by the inverter onboard electronic and only notified to the uc 20
The controller can regulate one or two evaporator pumps and takes care of automatic change over between pumps it s also possible to prioritize the pumps and temporarily disable one of the twos the controller is also able to control the pump speeds if the pumps are equipped with inverters 20
Setpoint override 22
Human machine interface 23
Working with this unit 23
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In the enter password screen the line with the password field will be highlighted to indicate that the field on the right can be changed this represents a setpoint for the controller pressing the push n roll the individual field will be highlighted to allow an easy introduction of the numeric password by changing all fields the 4 digits password will be entered and if correct the additional settings available with that password level will be disclosed 24
The active item is highlighted in contrast in this example the item highlighted in main menu is a link to another page by pressing the push n roll the hmi will jump to a different page in this case the hmi will jump to the enter password page 24
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Menu navigation 25
The first column is the top level of the menu hierarchy as the user makes selections in a column they move to the right when no more menus exist in a path selecting an option takes the user to the selected screen some options are only visible when they can be selected as a result of unit configuration and user password 25
Basic settings 26
Before starting up the unit some basic settings need to be done these set points can be accessed via the following path 26
Chiller configuration setting 26
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Generally this setting has been done in the factory however chiller configuration settings must be set via hmi keypad when the new software is installed unless setting all configurations the chiller will not be able to start 26
Apply changes yes this will cause a controller reboot 27
Controller ip setup 27
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Lon setup 27
Modification to any of these value will require to be acknowledged to the controller by setting 27
Setup for bms 27
The following set points have to be set based on customer requirements for enabling the unit working with bms 27
The microtech iii controller has an embedded web server showing a replica of the onboard hmi screens to access this additional web hmi can be required to adjust the ip settings to match the settings of the local network this can be done in this page please contact your it department for further information on how to set the following setpoints the controller also supports dhcp in this case the name of the controller must be used 27
Apply changes yes this will cause a controller reboot 28
Bacnet setup 28
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Modification to any of these value will require to be acknowledged to the controller by setting 28
Apply changes yes this will cause a controller reboot 29
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Date time 29
Modbus setup 29
Modification to any of these value will require to be acknowledged to the controller by setting 29
On board real time clock settings are maintained thanks to a battery mounted on the controller make sure that the battery is replaced regularly each 2 years 29
Scheduled maintenance 29
This may contain the contact number of the service organization taking care of this unit and the next maintenance visit schedule 29
This page will allow adjusting the time and dating in the uc this time and date will be used in the alarm log and to enable and disable the quiet mode additionally it s also possible to set the starting and ending date for the daylight saving time dls if used 29
All the set points required for above items can be accessed via the view set unit setup 30
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Following list describes each set point under setup w under write column in the list means the maintenance password is required to change values 30
Operation settings 30
To make the unit working on purpose the following items need to be set correctly in particular first two items have to be set for all chillers other items are for optional controls the following sections describe how to deal with each parameter 30
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After the installation of the unit check follows before switching on the circuit breaker 32
Before operation 32
Checks before initial start up 32
Confirm that the quality and volume of water described in the installation manual is provided to the unit and also air should be purged from system completely finally make sure that water can circulate system properly 32
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In order to avoid compressor damage it is necessary to turn the crankcase heater on for at least 6 hours prior to start compressor after a long period of standstill 32
Make sure that the circuit breaker on the power supply panel of the unit is switched off 32
Power supply connection and crankcase heating 32
Water supply 32
Close all service accesses of the unit after installation and setting are done 2 the access on the control box or all electrical relates may only be worked by the licenced 33
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Don t step on the top of chiller 33
Electrician for maintenance purpose 33
General recommendations 33
In order to ensure optimal availability of the unit proper maintenance is required at regular intervals it is once a year for air conditioning application and once every 4 months for other applications recommended 33
In order to prevent an evaporator and water pipng from freezing when unit is off make sure all 33
Install an optional digital remote controller if accessibility of the digital controller is frequently 33
Maintenance 33
Make sure that all the electrical power to the unit must be turned off for the maintenance not 33
Never clean the unit with water under pressure 33
Occurred 33
Require electrical power only the licensed electrician is allowed for checking the wiring and power supply to the unit 33
The water is drained out completely from system or make sure appropreate anti freeze devices i e heater are installed and they work properly don t turn the electrical power off to the unit if the anti freeze devices are hooked up to the unit 33
Cooling chillers 34
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Enabling and disabling the run command is accomplished using set points and inputs to the chiller the unit switch remote switch input and unit enable set point all are required to be on or enable for the unit to be enabled when the control source is set to local the same is true if the control source is set to network with the additional requirement that the bas enable set point must be enabled the table below shows how to set the switches and set points for enabling unit run command 34
Heat pump chillers 34
Note x indicates that the value is ignored 34
Note1 x indicates those settings can be ignored note2 heat cool switch needs 3seconds to make sure heat or cool state when it s changed 34
Unit availability 34
Unit enabling 34
Unit mode can be set according to the following table if the mode change is occurred during operation the chiller will stop at once then restart in required mode test mode can be enabled only if the unit is off 34
Unit mode selection 34
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Note x indicates those settings can be ignored 35
The displayed unit status should be determined by the conditions in the following table 35
Unit status 35
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For heat pump unit if unit type set point is set to heat pump the base lwt target shall be set according to the table below 36
Lwt target 36
Lwt target resetting 36
Lwt target setting 36
Note x indicates that the value is ignored 36
Note x indicates that the value is ignored for cooling unit if unit type set point is set to cooling the base lwt target shall be set according to the table below 36
The base lwt target may be reset and it is configured for a reset the type of reset to be used is determined by the lwt reset type set point after resets are applied the lwt target can never exceed a value of 20 c in cooling and never fall short of a value of 25 c in heating mode target will be reset every 10seconds with each 0 c 36
The follows define the how to set or reset the lwt target by local or network control 36
Unit functions 36
20ma reset 37
No reset 37
Return reset 37
Oat reset 38
Circuit staging sequence 40
General unit control 40
Lwt error 40
Pump selection 40
Summary of unit capacity control 40
Unit capacity control 40
All running circuits should shut down when 41
An additional circuit should be started when 41
Circuit status 41
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Delta t 41
Lwt active set point 41
Lwt error 41
Lwt error shut down delta t 41
Lwt error stage down delta t 41
Shut down delta t start up delta t 41
Stage down 41
Stage up delta t 41
Start up delta t 41
Start up stage up stage down shut down delta t 41
The displayed unit status should be determined by the conditions in the following table 41
The first circuit on the unit should be started when the first circuit on the unit should be started when 41
The purpose of this logic is to avoid excessive circuit start and stop when the cooling or heating capacity required is very low start up delta t and the shut down delta t shall use the diagrammed below 41
When multiple circuits are running one should shut down if 41
Defrost control 42
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Unit alarm 43
Unit alarm descriptions 43
Phase volts loss gfp fault 44
Unit fault alarms 44
Water flow loss 44
Water freeze shut down 44
Pump freeze protection 46
Pump hot water protection 46
Water temp inverted 46
High oat lock out 47
Low oat lock out 47
Ewt sensor fault 48
Lwt sensor fault 48
Oat sensor fault 48
Bad demand limit input 49
Bad lwt reset point 49
Bad unit current reading 49
Emergency stop 49
External alarm 49
Unit warning alarms 49
Bad flexible current limit input 50
Chiller network communication failure 50
Circuit alarm 51
Circuit alarm descriptions 51
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Detailed circuit alarms 51
High discharge port temperature 51
Mechanical high pressure switch 51
Purpose avoid damage to compressor oil deterioration high fluctuation of metal motor triggers actions and resets the circuit takes rapid shutdown when the discharge port temperature becomes higher than the limit the circuit takes unload or inhibit load sequence before it goes over the limit shutdown requires reset manually unload and inhibit load is reset automatically when conditions are recovered 51
Purpose to avoid the circuit operates at over design pressure trigger hps digital input is open action rapid shut down of circuit reset 51
High condenser pressure shutdown 52
High pressure ratio shutdown 52
Low evap gas temperature freeze shutdown 52
Low evaporator pressure shutdown 52
Condenser pressure sensor fault 53
Inverter over current shutdown 53
Low pressure differential shutdown protection 53
No pressure change after start 53
Deicer temperature sensor fault 54
Evaporator pressure sensor fault 54
Suction temperature sensor fault 54
Evaporator gas temperature sensor fault 55
High condenser pressure at start 55
No pressure at start 55
Compressor alarm 56
Compressor alarm descriptions 56
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Detailed compressor alarm 56
High compressor body temperature 56
High discharge gas temperature 56
Inverter over current shut down 56
Purpose for compressor protection trigger compressor body temperature is higher than the limit action rapid shutdown of compressor reset this alarm can be cleared manually via the keypad or via bas command if trigger conditions no longer exists 56
Purpose for compressor protection trigger discharge gas temperature is higher than the limit action compressor should take rapid shutdown as an event however if it repeats 3 times on the same compressor within a week it becomes an alarm reset this alarm can be cleared manually via the keypad or via bas command if trigger conditions no longer exists 56
See inverter over current shutdown unload inhibit load in circuit alarm 56
Unless otherwise specified compressor alarm shouldn t be triggered during compressor state is off 56
Action rapid shutdown of compressor reset this alarm can be cleared manually via the keypad or via bas command if inv no longer requires stop 57
Compressor body temperature sensor fault 57
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Discharge temperature sensor fault 57
Imbalance inverter current 57
Inverter alarm 57
Inverter alarm list 57
Trigger one of the motor current is extremely higher than other motor currents note inv current use inv secondary current action rapid shutdown of compressor reset this alarm can be cleared manually via the keypad or via bas command when compressor is off 57
Trigger out of range for 1second action 57
Trigger out of range for 1second action rapid shutdown of compressor reset this alarm can be cleared manually via the keypad or via bas command if the sensor is back in range for 5seconds 57
Compressor shutdown for oil distribution 58
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If the compressor alarm is occurred some of the other running compressors in the circuit should be shutdown due to oil management here is the list for showing which one should be shutdown when compressor alarm is occurred 58
Rapid shutdown of compressor reset this alarm can be cleared manually via the keypad or via bas command if the sensor is back in range for 5seconds 58
Capacity control 59
Ice mode 59
Ice mode delay timer 59
Ice mode operation 59
Optional function 59
Unit setting 59
Fan control target 60
In cooling cycle 60
In heating cycle 60
Lwt reset 60
Noise reduction mode 60
Noise reduction operation 60
Unit setting 60
Capacity control with current limit 61
Current limit control 61
Unit current calculation 61
Unit current control during defrost 61
Unit current limit control 61
Unit setting 61
Current limit adjustment 62
Flexible current limit control 62
Unit setting 62
20ma demand limit control 63
Capacity control with demand limit 63
Capacity limit calculation 63
Demand limit control 63
Demand limit control during defrost 63
Multiple capacity limits 63
Unit setting 63
Network limit control 64
Network limit control during defrost 64
Unit setting 64
Fan vfd control 65
Liquid line solenoid valve 65
Soft load control 65
Exv control with llsv 66
Water valve control 66
Chiller network control 67
Close operation 67
Communication setting 67
Master slave communication 67
Open operation 67
Opening operation 67
Rapid restore 67
Unit setting 67
Water valve control 67
Communication failure 68
Communication type 68
Operation with communication failure 68
Capacity control 69
Operation after restoring communication 69
Capacity limit 70
Lwt active set point 70
Unit shut down 70
Unit stage down 70
Unit stage up 70
Unit start up 70
Chiller network status 71
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Defrost 71
If the unit is in chiller network the defrost control of those units shall be limited to maintain certain capacity 71
Next one to start next one to stop 71
The displayed chiller network status should be determined by the conditions in the following table 71
The master unit will manage which one should be next to start or stop based on the following table 71
All set points can be accessed via key pad with certain password those set points do not require controller reset to activate new setting direction will be main menu view set unit setup 72
All set points can be accessed via key pad with certain password those set points require controller reset to activate new setting direction will be main menu commission unit configuration 72
Chiller configuration set points 72
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Set point table 72
Unit set points 72
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All set points can be accessed via key pad with certain password those set points do not require controller reset to activate new setting direction will be main menu view set circuit setup 74
Circuit set points 74
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Alarm limit set points 75
All outputs except for compressor starter outputs should be manually controllable via test mode set points for each output there should be a set point that is visible and changeable only when test mode is enabled for unit level outputs test mode is enabled only when the unit mode is test for circuit outputs test mode is enabled when either unit mode is test or the circuit mode is test when the unit mode is no longer test all unit test mode set points should be changed back to their off values the same should occur for circuit test mode set points when test mode is no longer enabled for the circuit all the circuit test mode set points for that circuit should be changed back to their off values 75
All set points can be accessed via key pad with certain password those set points do not require controller reset to activate new setting direction will be main menu alarms alarm limits 75
All set points can be accessed via key pad with certain password those set points do not require controller reset to activate new setting direction will be main menu view set unit setup calibrate sensors or main menu view set circuit setup calibrate sensors 75
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Sensor calibration set points 75
Test mode set points 75
At cooling mode 76
At heating mode 76
Calculations 76
Discharge superheat 76
Evaporator approach condenser approach 76
Pressure differential 76
Pressure ratio 76
Refrigerant saturated temperature 76
Suction superheat 76
Unit and circuit capacity 77
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Daikin applied europe s p a 78
Via piani di santa maria 72 00040 ariccia roma italia tel 39 06 93 73 11 fax 39 06 93 74 014 http www daikinapplied eu 78

Daikin EWAQ340GZXR [42/78] Defrost control

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