![Daikin EWAQ340GZXR [61/78] Unit current limit control](/img/pdf.png)
Daikin EWAQ340GZXR [61/78] Unit current limit control
![Daikin EWYQ320GZXR [61/78] Unit current limit control](/views2/1675086/page61/bg3d.png)
D-EOMHP00706-14EN - 61/78
8.3 Unit current limit control
8.3.1 Unit setting
Unit current Limit control should be enabled only when Current limit enable digital input is closed and
Current limit set point is enabled. If this control is enabled ‘Current limit type’, ‘Current at 20mA’ and
‘Current limit’ set points needs to be arranged for each unit.
Current limit
type
Current at
20mA
Current
limit
Description
INV
N/R
Need to set
some value
Unit current will be limited by inverter primary current and fans estimated
current. It doesn’t require an additional current measuring device, such as CT.
CT
(4-20mA)
Need to set
some value
Need to set
some value
Unit current will be limited by an analog input from CT.
This control can be enabled during normal operation without shutdown.
8.3.2 Current limit control
8.3.2.1 Unit current calculation
• If ‘Current limit type’ is set to INV:
See section 4 “Calculations”
• If ‘Current limit type’ is set to CT (4-20mA):
Unit current will be calculated based on the 4-20mA input that received a signal from an external device
and ‘Current at 20mA’ set point.
8.3.2.2 Capacity control with current limit
The current limit should use a dead band centered on the actual limit value, such that unit capacity
increase is not allowed when current is within this dead band. If unit current is above the dead band,
capacity should be decreased until it is back within the dead band. The current limit dead band should be
5% of the current limit.
8.3.3 Unit current control during defrost
Circuit capacity control during defrost should not be limited by this function. In other words if the unit
has dual circuits this function shall be accomplished by the circuit which is not doing defrost.
Calculated current (A)
Analog input (mA)
Current at
20mA
0
4mA
20mA
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
- D eomhp00706 14en 13 78 13
- Control system 14
- Overview 14
- Communication components 15
- D eomhp00706 14en 15 78 15
- 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
- D eomhp00706 14en 16 78 16
- 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
- D eomhp00706 14en 17 78 17
- 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
- D eomhp00706 14en 18 78 18
- Rx led1 18
- Tx led2 18
- Available sensors 19
- Compressor vfd led 19
- D eomhp00706 14en 19 78 19
- 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
- D eomhp00706 14en 20 78 20
- 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
- D eomhp00706 14en 24 78 24
- 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
- D eomhp00706 14en 25 78 25
- 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
- D eomhp00706 14en 26 78 26
- 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
- D eomhp00706 14en 27 78 27
- 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
- D eomhp00706 14en 28 78 28
- 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
- D eomhp00706 14en 29 78 29
- 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
- D eomhp00706 14en 30 78 30
- 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
- D eomhp00706 14en 31 78 31
- 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
- D eomhp00706 14en 32 78 32
- 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
- D eomhp00706 14en 33 78 33
- 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
- D eomhp00706 14en 34 78 34
- 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
- D eomhp00706 14en 35 78 35
- 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
- D eomhp00706 14en 36 78 36
- 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
- D eomhp00706 14en 41 78 41
- 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
- D eomhp00706 14en 43 78 43
- 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
- D eomhp00706 14en 51 78 51
- 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
- D eomhp00706 14en 56 78 56
- 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
- D eomhp00706 14en 57 78 57
- 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
- D eomhp00706 14en 58 78 58
- 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
- D eomhp00706 14en 71 78 71
- 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
- D eomhp00706 14en 72 78 72
- Set point table 72
- Unit set points 72
- D eomhp00706 14en 73 78 73
- 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
- D eomhp00706 14en 74 78 74
- 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
- D eomhp00706 14en 75 78 75
- 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
- D eomhp00706 14en 78 78 78
- 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
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