![Daikin Microtech III [8/44] Communication modules](/img/pdf.png)
Daikin Microtech III [8/44] Communication modules
![Daikin Microtech III [8/44] Communication modules](/views2/1656105/page8/bg8.png)
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4.2. Controller Architecture
The overall controller architecture is the following:
• One MicroTech III main controller
• I/O extensions as needed depending on the configuration of the unit
• Communications interface(s) as selected
4.3. Controller and Extension Details
Peripheral Bus is used to connect I/O extensions to the main controller.
Controller/
Extension Module
Siemens Part Number Address Usage
Main Controller POL687.70/MCQ n/a Used on all configurations
EEXV Module 1 POL94E.00/MCQ 3 Used on all configurations
EEXV Module 2 POL94E.00/MCQ 5 Used when configured for 2 circuits
Options Module
POL965.00/MCQ 18
Used when configured for at least one option
4.4. Communication Modules
Any of the following modules can be connected directly to the left side of the main controller to allow a BAS or
other remote interface to function. Up to three can be connected to the controller at a time. The controller should
automatically detect and configure itself for new modules after booting up. Removing modules from the unit will
require manually changing the cshouldonfiguration.
Module Siemens Part Number Usage
BacNet/IP POL908.00/MCQ Optional
Lon POL906.00/MCQ Optional
Modbus POL902.00/MCQ Optional
BACnet/MSTP POL904.00/MCQ Optional
AWM POL909.00/MCQ Optional
Содержание
- Air cooled scroll chiller 1
- Control panel operating manual 1
- Table of contents 2
- Caution 5
- Danger 5
- Introduction 5
- Warning 5
- Controller operating limits 6
- Two levels of security protection against unauthorized changing of setpoints and other control parameters warning and fault diagnostics to inform operators of warning and fault conditions in plain language all events and alarms are time and date stamped for identification of when the fault condition occurred in addition the operating conditions that existed just prior to an alarm shutdown can be recalled to aid in isolating the cause of the problem twenty five previous alarms and related operating conditions are available remote input signals for chilled water reset demand limiting and unit enable test mode allows the service technician to manually control the controllers outputs and can be useful for system checkout building automation system bas communication capability via lontalk modbus or bacnet standard protocols for all bas manufacturers pressure transducers for direct reading of system pressures preemptive control of low evaporator pressure conditions and pressure to take corre 6
- Controller description 7
- General description 7
- Hardware structure 7
- Communication modules 8
- Controller and extension details 8
- Controller architecture 8
- Analog inputs 9
- Analog outputs 9
- Controller inputs and outputs 9
- Digital inputs 9
- Digital outputs 9
- Main controller 9
- Options expansion module 9
- Analog inputs 10
- Analog outputs 10
- Digital inputs 10
- Digital outputs 10
- Exv module 1 10
- Exv module 2 10
- Stepper motor output 10
- Analog outputs 11
- Digital outputs 11
- Stepper motor output 11
- Actuator information 12
- All temperature sensors will be termotech ntc sensors reading 10k ω at 25 c with temperature resistance the steinhart hart coefficients for this sensor are as follows c1 is 1 25191e 03 c2 is 2 47363e 04 c3 is 8 51343e 08 12
- Pressure 12
- Pressure inputs will be read using 0 to 5 volt ratiometric sensors nominal voltage range will be 0 to 4 volts pressure on the low side will be measured using pressures from 34 kpa 5 psi to 2448 kpa 355 psi in the nominal voltage range pressure on the high side will be measured using sensor reading pressures from 29 kpa 4 psi to 4975 kpa 721 psi in the nominal voltage range 12
- Sensor information 12
- Set point tables 12
- Set points 12
- Set points are initially set to the values in the default column and can be adjusted to any value in the range column unit level set points 12
- Set points are stored in permanent memory read and write access to these set points is determined by a separate hmi specification 12
- Temperature 12
- The electronic expansion valves used are danfoss supplied and all use the same bipolar stepper motor the stepper driver is configured as follows total steps 3810 movement speed 150 steps second acceleration 0 holding current 0 move current 140ma overdrive closed steps 100 12
- Auto adjusted ranges 14
- Exv position set point on each circuit follows the actual exv position while exv control auto when exv control manual the position set point is changeable 14
- Note condenser target 67 and condenser target 33 will be available only when number of comps is 3 1 circuit or 6 2 circuits condenser target 50 will be available only when number of compressors is 2 1 circuit or 4 2 circuits 14
- Proper amount of antifreeze must be applied 14
- Some settings have different ranges of adjustment based on other settings 14
- Special set point operations 14
- The circuit mode set points cannot be changeable unless the corresponding circuit switch is off the compressor enable set points cannot not be changeable unless the corresponding compressor is not running 14
- The following set points cannot be changeable unless the unit switch is off number of circuits number of compressors number of fans fan vfd enable lls valve enable double stpt enable lwt reset enable demand lim enable ext alarm enable 14
- 15 the following settings can be automatically set back to off after being on for 1 second clear alarms network clear alarms clear cycle timers clear ice timer stage delay clear 15
- All outputs are manually controllable via test mode set points only when test mode is enabled 15
- 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 15
- Test mode set points 15
- The compressor outputs are a special case and they are allowed to remain on for 3 seconds before being automatically set back to off 15
- The table below summarizes the possible unit configurations 15
- Unit configurations 15
- V type condensation is managed at unit level both circuits work with the same saturated condensing temperature more specifically with the higher of each circuit probe readings w type condensation is managed at circuit level each circuits works with its own saturated condensing temperature 15
- When the unit mode is no longer test all unit test mode set points are be changed back to their off values when test mode is no longer enabled for a circuit all the circuit test mode set points for that circuit are changed back to their off values 15
- Calculations 16
- Control band 16
- Evaporator delta t 16
- Lwt error 16
- Lwt slope 16
- Pulldown rate 16
- Staging temperatures 16
- Unit capacity 16
- Unit functions 16
- Unit states 16
- Evaporator pump control 17
- Power up start delay 17
- Evaporator pump configuration 18
- Primary standby pump staging 18
- Pump selection 18
- A minimum amount of time defined by the stage up delay set point passes between increases in the capacity stage this delay only apply when at least one compressor is running if the first compressor starts and quickly shuts off for some reason another compressor may start without this minimum time passing 19
- Auto control 19
- Compressor staging in cool mode 19
- If auto pump control is selected the primary standby logic above is still used when the evaporator is not in the run state the run hours of the pumps will be compared the pump with the least hours will be designated as the primary at this time 19
- Leaving water temperature lwt reset 19
- Lwt target 19
- Stage up delay 19
- The base lwt target may be reset if the unit is in cool mode and lwt reset is enabled via the set point the reset amount is adjusted based on the 4 to 20 ma reset input reset is 0 if the reset signal is less than or equal to 4 ma reset is 5 6 c 10 f if the reset signal equals or exceeds 20 ma the amount of reset will vary linearly between these extremes if the reset signal is between 4 ma and 20 ma when the reset amount increases the active lwt target is changed at a rate of 0 c every 10 seconds when the active reset decreases the active lwt target is changed all at once after the reset is applied the lwt target can never exceed a value of 15 6 c 60 f 19
- The first compressor on the unit is started when evaporator lwt is higher than the startup temperature additional compressors can be started when evaporator lwt is higher than the stage up temperature and the stage up delay is not active when multiple compressors are running one shut down if evaporator lwt is lower than the stage down temperature and the stage down delay is not active all running compressors shut down when the evaporator lwt is lower than the shut down temperature 19
- The lwt target varies based on settings and inputs the base lwt target is selected as follows 19
- Unit capacity control 19
- Unit capacity control will be performed as described in this section all unit capacity limits described in following sections must be applied as described 19
- Compressor staging in ice mode 20
- Next to start 20
- Next to stop 20
- Stage down delay 20
- Stage up delay 20
- Staging sequence 20
- Demand limit 21
- Four compressors 21
- Network limit 21
- Six compressors 21
- The maximum unit capacity can be limited by a 4 to 20 ma signal on the demand limit analog input this function is only enabled if the demand limit option set point is set to enable the maximum unit capacity stage is determined as shown in the following tables two compressors 21
- The maximum unit capacity can be limited by a network signal this function is only enabled if the control source is set to network and the network limit option set point is set to enable the maximum unit capacity stage is based on the network limit value received from the bas and is determined as shown in the following tables two compressors 21
- Three compressors 21
- Unit capacity limits can be used to limit total unit capacity in cool mode only multiple limits may be active at any time and the lowest limit is always used in the unit capacity control 21
- Unit capacity overrides 21
- 22 four compressors 22
- Condensation is managed at this level when the unit is configured a v double circuit type what follows covers only this type of unit condenser control of other unit configurations included v single circuit is described in circuit functions chapter below in this document 22
- Fan staging 22
- Fan staging accommodates anywhere from 4 to 6 common fans using up to 4 outputs for control the total number of fan on is adjusted with changes of 1 or 2 fan at time as shown in the following table 22
- Fans have to be staged as needed any time at least one compressor is running 22
- High ambient limit 22
- Maximum lwt pulldown rate 22
- On units configured with single point power connections the maximum load amps could be exceeded at high ambient temperatures if all compressors are running on circuit 1 or all but one compressor on circuit 1 power connection is single point and the oat is greater than 46 c 115 f circuit 2 is limited to running all but one compressor this limit will allow the unit to operate at higher temperatures than 46 c 115 f 22
- Ref_sat_con t max t_sat_cond_t_cir 1 t_sat_cond_t_cir 1 22
- Since proper staging up has to be assured for the circuit with the greater saturated condensing temperature if both circuits are on the have the same reference saturated condensing temperature that is calculated as the higher of each circuit saturated condensing temperature 22
- Six compressors 22
- The maximum rate at which the leaving water temperature can drop shall be limited by the maximum pulldown rate set point only when the unit mode is cool if the rate exceeds this set point no more compressors shall be started until the pulldown rate is less than the set point running compressors will not be stopped as a result of exceeding the maximum pulldown rate 22
- Unit condenser 22
- A minimum condenser target calculated on the base of evaporator lwt has anyway to be enforced 23
- Condenser target 23
- For v double circuit unit further target adjustment is needed to face up possibly significant difference between circuits saturated condensing temperatures this can happen when unit load is unbalanced between circuits 25 75 or 50 with one circuit at full load and the other off 23
- If unit load is 50 and one circuit if off starting the application forces the unit load redistribution by mean of a staging down 23
- In this condition to prevent a further compressor stage up from being inhibited the condenser targe 23
- Is override as follows new condenser target condenser targe 23
- Staging up 23
- The condenser targe 23
- The condenser target is automatically selected from the set points see set points tables condenser target x basing on the actual unit capacity percentage compressors running total number of compressors on the unit each stage of capacity on a circuit uses a different condensing target set point 23
- The first fan will not start until the evaporator pressure drop or condenser pressure rise requirement for the no pressure change after start alarm is satisfied once that requirement is met if there is no fan vfd then the first fan turns on when the saturated condenser temperature exceeds the condenser target if there is a fan vfd then the first fan turns on when the saturated condenser temperature exceeds the condenser target less 5 6 c 10 f after this the four stage up dead bands shall be used stages one through four use their respective dead bands stages five through six use the stage up dead band 4 when the saturated condenser temperature is above the target the active deadband a stage up error is accumulated stage up error step saturated condenser temperature target stage up dead band 23
- The standard unit capacity control logic provides the next off compressor to stop on the full load circuit and consequently the unit load will be rebalanced in this conditions there s no issues for further compressor start 23
- Thus will be the maximum between selected set point and the calculated one 23
- Unbalanced load management 23
- Calculations 24
- Circuit functions 24
- Condenser approach 24
- Evaporator approach 24
- Refrigerant saturated temperature 24
- Stage up compensation 24
- Staging down 24
- Vfd state 24
- Circuit control logic 25
- Circuit enabling 25
- Circuit states 25
- Compressor availability 25
- Pumpdown pressure 25
- Suction superheat 25
- Low ambient starts 26
- Pumpdown procedure 26
- Circuit condenser 27
- Circuit status 27
- Compressor control 27
- Cycle timers 27
- Fan staging 27
- Starting a compressor 27
- Stopping a compressor 27
- A minimum condenser target calculated on the base of evaporator lwt has anyway to be enforced 28
- Condenser target 28
- Staging up 28
- The condenser target is automatically selected from the set points see set points tables condenser target x basing on the actual unit capacity percentage compressors running total number of compressors on the circuit each stage of capacity on a circuit uses a different condensing target set point 28
- The condenser target thus will always be the maximum between selected set point and the calculated one 28
- The first fan will not start until the evaporator pressure drop or condenser pressure rise requirement for the no pressure change after start alarm is satisfied once that requirement is met if there is no fan vfd then the first fan turns on when the saturated condenser temperature exceeds the condenser target if there is a fan vfd then the first fan turns on when the saturated condenser temperature exceeds the condenser target less 5 6 c 10 f after this the four stage up dead bands shall be used stages one through four use their respective dead bands stages five through six all use the stage up dead band 4 28
- Auto control 29
- Exv control 29
- Stage up compensation 29
- Staging down 29
- Vfd state 29
- Alarms 30
- Capacity overrides limits of operation 30
- Exv position range 30
- High condenser pressure 30
- Liquid line solenoid valve 30
- Low evaporator pressure 30
- Manual control 30
- Pvm gfp fault 30
- Unit fault alarms 30
- Evaporator flow loss 31
- Evaporator lwt sensor fault 31
- Evaporator water freeze protect 31
- Evaporator water temperatures inverted in cool mode 31
- Freeze temp sensor fault 31
- Evaporator pump 1 failure 32
- External alarm 32
- Exv module 1 comm failure 32
- Exv module 2 comm failure 32
- Low ambient lockout 32
- Option module comm failure 32
- Outdoor air temperature sensor fault 32
- Unit problem alarms 32
- Bad demand limit input 33
- Bad lwt reset input 33
- Circuit fault alarms 33
- Evaporator ewt sensor fault 33
- Evaporator pump 2 failure 33
- External event 33
- Low evaporator pressure 33
- Pvm gfp fault 33
- Unit warning alarms 33
- Condenser pressure sensor fault 34
- Evaporator pressure sensor fault 34
- High condenser pressure 34
- Low oat restart fault 34
- Mechanical high pressure switch 34
- Motor protection fault 34
- No pressure change after start 34
- 0 suction temperature sensor fault 35
- Circuit events 35
- Circuit warning alarms 35
- Events 35
- Failed pumpdown 35
- Low evaporator pressure hold 35
- Low evaporator pressure unload 35
- Unit events 35
- Unit power restore 35
- High condenser pressure unload 36
- The unit controller operation 36
- Using the controller 36
- Navigating 37
- Passwords 37
- In the right of the line and used to link to the next menu parameters with a value or adjustable setpoint 38
- Navigation mode 38
- Edit mode 39
- Optional remote user interface 40
- Basic control system diagnostic 42
- Controller maintenance 43
- Daikin europe n v 44
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