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Danfoss AK2-SC 255 Скачать руководство пользователя страница 24

RS.8D.M1.22

AK2-SC 255 Reference Manual

23

Stop comps on high temp

(List box: Yes, No) Whether or not compressors are to
be shut down on high discharge temperature.

Cutout

(0.0 to 300.0) The discharge temperature at which
compressors are to be cut out.

Cutin

(0.0 to 300.0) After a cut-out on high discharge
temperature, the discharge temperature at which
compressors are to be cut in.

Stop comps on low temp

(List box: Yes, No) Whether or not comrpessors are to
be cut out on low discharge temperature.

Lockout

(0 to 255) The number of minutes that must elapse
before a lockout on low discharge temperature. (See
note on next field).

below

(0 to 300) The temperature that discharge must be
below for the time specified in the preceding field
before lockout on low discharge temperature occurs.
Note: If discharge temperature rises above the
setpoint, the time for lockout will restart from zero.

Disch pressure safety

(List box: Yes, No) Whether or not comrpessors are to
be cut out on high discharge pressure.

Cutout

(0.0 to 500.0) The discharge pressure at which com-
pressors are to be cut out.

Cutin

(0.0 to 500.0) After a cut-out on high discharge
pressure, the discharge pressure at which compressors
are to be cut in.

Unload before cutout

(List box: Yes, No) Whether or not comrpessors are to
be unloaded before being cut out.

Neutral Zone
control

The next page of compressor configuration deals with neutral zone control. Basically,
neutral zone control acts to bring the current pressure toward target pressure more
quickly the greater the difference between the two. The screen looks like this:

The default settings are as shown in the screen above. It is recommended that the
values not be changed without a thorough understanding of the algorithm. A thorough
explanation of neutral zone control is available as an appendix to this manual.

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Содержание AK2-SC 255

Страница 1: ...REFRIGERATION AND AIR CONDITIONING AK2 SC 255 Reference Manual Users Manual...

Страница 2: ...RS 8D M1 22 AK2 SC 255 Reference Manual 1 AK2 SC 255 Rack Controller System Reference Manual...

Страница 3: ...2 AK2 SC 255 Reference Manual RS 8D M1 22...

Страница 4: ...rlier controllers If you can you should check the Danfoss web site at www acr danfoss com and select the menu item for product literature The AK2 SC 255 literature will be in the Supermarket electroni...

Страница 5: ...d safety information 22 23 Neutral Zone control 23 Compressor capacity staging patterns 24 25 Configuring Evaporators 25 31 Case lights button 27 ConfiguringAK2 SC 255 refrigeration circuits 28 Config...

Страница 6: ...nfiguration 75 76 RTU alarms configuration 76 RTU board points configuration 76 AHU Configuration 76 80 AHU fan configuration 76 78 AHR outside air coil configuration 79 80 RTC Configuration 80 93 RTC...

Страница 7: ...setup 110 113 Board points configuration lighting 113 Powerlink configuration 113 Cutler Hammer configuration 113 Powerlink and Cutler Hammer board point configuration 113 Locate procedure 114 1 5 Ene...

Страница 8: ...iscellaneous conversiosn 142 143 Miscellaneous calculations 143 144 Point creation 144 145 Custom strategy example 145 153 Creating the miscellaneous points Sensor inputs 145 146 Writing the custom st...

Страница 9: ...rvice screen 175 2 5 Using the Communications Screens 176 187 Host Network screen 176 I O Network Status screen 176 177 List Points 177 179 List Nodes 179 180 IP Network Ethernet 180 181 Alarm routing...

Страница 10: ...RS 8D M1 22 AK2 SC 255 Reference Manual 9 Overrides using the Manager s Override box 199 200 Keyswitch Override for refrigeration high temperature alarms 200 2 9 Using the Audit Trail 200 202...

Страница 11: ...10 AK2 SC 255 Reference Manual RS 8D M1 22...

Страница 12: ...may be limited to such items as are necessary to check out the mechanical equipment or provide basic service The configuration can be changed or added to at any time later Battery The unit s backup ba...

Страница 13: ...apter 5 Using the System Using menus To select from any SC 255 menu first use the arrow keys to move the cursor to the item you want then press the ENTER key You can use the EXIT key to retrace your s...

Страница 14: ...may have been partially configured by the rack manufacturer In that case when you select Refrigeration from the Main Menu the SC 255 will display the Refrigeration Menu left It lists the rack or racks...

Страница 15: ...entries that you need to spell out The Rack label field contains a label one character in length The Oil type field is also a label field but it is 9 characters long allowing you to spell out a word...

Страница 16: ...the list box s cursor on the selection you want press ENTER to save your selection Some list boxes contain only two choices for example Yes and No in the Monitor phase loss field Some may contain many...

Страница 17: ...only one way to add a rack From the Main Menu select Configuration then Refrigeration and the Rack Configuration screen appears At the bottom left of the screen are the words Add Rack Move the cursor...

Страница 18: ...evealed The fields and their contents are as follows Suction I D 2 label fields the first is a list box A to Z the second is 9 characters not constrained This is the identifica tion you wish to assign...

Страница 19: ...t 50 0 to 100 0 The temperature that the adaptive control algorithm will seek to maintain in the fixture Does not appear when dynamic adaptive control is selected Range 0 0 to 100 0 The dead band arou...

Страница 20: ...itor desuperheat temp List box Yes No Close EEV valves during rack shutdown List box Yes No If suct above target by 0 to 999 9 Number of psig above target when AKV valves will be closed during rack sh...

Страница 21: ...down Control desuperheater List box Yes No Whether or not de superheater control is implemented on this rack Controlling sensor List box Desuper In AA Control is based on a sensor moni toring the liqu...

Страница 22: ...by the respective unloader Inverter control List box Type of variable speed control None No inverter control VO An inverter is controlled by an analog output variable output VLT A Danfoss VLT adjusta...

Страница 23: ...l pressure On Off Adigital input on off input is used to monitor an oil pressure switch Copeland A Copeland oil monitor is used Lockout comp on oil fail List box Yes No Whether or not compressors will...

Страница 24: ...rises above the setpoint the time for lockout will restart from zero Disch pressure safety List box Yes No Whether or not comrpessors are to be cut out on high discharge pressure Cutout 0 0 to 500 0 T...

Страница 25: ...isplay that results will show a row compressor icons for each stage A compressor s unloaders are represented by the small rectangles to the right of the compressor icon In the sample screen compressor...

Страница 26: ...n In this manual we will discuss the configuration of SC 255 circuits and AKC 16x circuits For the other types of evapo rators please see the manuals on the individual controllers In the future when a...

Страница 27: ...ons Maximum concurrent electric defrosts Appears only if Auto defrost schedules is enabled 0 to 20 The number of electric defrosts that can be underway concurrently Include dripdown time Appears only...

Страница 28: ...lights to be switched on or off On Auto Choices are ON or automatic operation Off Auto Choices are OFF or automatic operation On Auto Off All three choices are available with a three position switch b...

Страница 29: ...etpoint 0 0 to 120 0 each stage has a separate setpoint The temperature at which the subcooling stage will become active Temperature is measured by a sensor at the liquid outlet of the subcooler Cutou...

Страница 30: ...st box Yes No Whether or not a box door switch will be monitored appears for boxes only Shutdown when door open List box Yes No Whether or not to shut down refrigeration when the box door is open No c...

Страница 31: ...e requirements set on this page must be satisfied for defrost to terminate List box Various termination strategies are listed Defrost sensor There is a dedicated defrost tem perature sensor that will...

Страница 32: ...above 0 0 to 100 0 The dewpoint above which anti sweat heaters will be on constantly Cycle above dewpoint 0 0 to 100 0 The dewpoint above which anti sweat heaters will be cycled Cycling will occur unl...

Страница 33: ...mination has not occurred on a setting configured in the previous screen Often called fail safe defrost time Defrost start time time of day one field for each of the number of defrosts configured in t...

Страница 34: ...ration can be shut down for cleaning or other service Shutdown schedules Paging down we reach the shutdown page s There are two schedules per page Each schedule has a field for time on time off days o...

Страница 35: ...on defined in the alarm routing screen at the interval set in the alarm routing screen from 10 to 99 minutes the default is every 10 minutes Delete The alarm settings will no longer appear on the scre...

Страница 36: ...n the configuration screen for air cooled condensers when Sat Cond Temp is selected as the Control sensor The change to saturated condensing temperature control strategy causes several of the followin...

Страница 37: ...s with a digital input created for each pair Control sensor List box Pressure A pressure sensor will be used to control the condenser fans An analog input sensor input will be created for the sensor D...

Страница 38: ...ed up When a stage is at maximum speed and additional fan capacity is needed the stage will be dropped to minimum speed and the next stage brought on at minimum speed then ramped up as required Neutra...

Страница 39: ...00 0 for temperature sensors The value that the control algorithm will seek to maintain with the selected strategy The next page has settings for high pressure bypass and for inverter control if used...

Страница 40: ...nufacturer s specifications RPM at max speed 1 to 6000 The RPM at the maximum percentage specified in the previous setting Inverter max resets 10 to 10 The maximum number of inverter resets after whic...

Страница 41: ...will be split Split deadband 0 0 to 25 Only with single split valves The deadband above the previous setpoint in which unsplitting cannot occur Drop fans List box Even Odd Only with single split valve...

Страница 42: ...e condenser control algorithm reacts with normal sensitivity Plus Zone 10 to 900 The PI algorithm sensitivity when current control sensor value is above the normal reaction zone Minus Zone 10 to 900 1...

Страница 43: ...ce from condenser to the rack Open SPR if discharge 0 0 to 200 0 The pressure differential above target at which the system pressure regulator will open Bleed valve List box Yes No Whether or not ther...

Страница 44: ...pears if control is by pressure Whether the drop leg temperature will be monitored A Yes answer here will create an analog input sensor input for the drop leg temperature sensor Control method List bo...

Страница 45: ...the second page following and change Fan inverter control to the appropriate variable speed control either VO or VLT to restore the variable speed choices here Rate of change A control strategy that s...

Страница 46: ...fill at which the fill valve will open and top off will begin Fill valve List box Yes No Whether or not the sump fill valve is controlled Monitor inlet temp List box Yes No Whether or not the inlet te...

Страница 47: ...echnician is required to clear the bypass by using the appropriate button in the status screen Freeze Protection List box Yes No Whether or not freeze protection control is implemented Freeze prot tem...

Страница 48: ...surge control will be implemented Cutin 0 0 to 100 0 The temperature at which the surge valve opens Cutout 0 00 to 100 0 The temperature at which the surge valve closes Liquid level sensor type List...

Страница 49: ...age will be turned off Stage 2 type The same choices as for Stage 1 type and setpoints are offered Flush Cycle List box Yes No Whether or not there is to be a flush cycle Flush Cycle Start Time Time o...

Страница 50: ...of the rack are presented The first page of suction alarms is shown at right above One of the list boxes has been opened to reveal its options For each alarm the first line contains an alarm type the...

Страница 51: ...the field then press the key then use the arrow keys to scroll through the settings then press ENTER What You Can Change in a Standard Alarm Standard alarms are the alarms that are automatically crea...

Страница 52: ...The default names for the outputs automatically added during configura tion of refrigeration are shown and will suffice in many applications They can be edited character by charac ter put the cursor o...

Страница 53: ...n the same line as PG DN for more is the SORT field By default sort mode is on and entries will be sorted by Bd Pt address if sort mode is turned off points from then on will be listed in order of cre...

Страница 54: ...t point enter the board and point address of the sending point Type List box AKS 32 100 Danfoss pressure sensor 0 to 100 psig AKS 32 200 Danfoss pressure sensor 0 to 200 psig AKS 32 500 Danfoss pressu...

Страница 55: ...on and entries will be sorted by Bd Pt address if sort mode is turned off points will be listed from then on in the order in which they were created The sorting occurs when you press EXIT and will be...

Страница 56: ...Voltage The point will be read as ON if it senses no voltage It will read OFF when it senses voltage Latching The point will be read as ON when it first senses a momentary voltage It will continue to...

Страница 57: ...t it press ENTER Bd Pt Enter the Bd Pt address to which the load is wired Range List box two variable output ranges are available depending on the drive requirements 0 10 Volts 0 5 Volts SORT At the b...

Страница 58: ...Smart Case Controllers The fields and contents are Name Label field any 15 characters The name of the evaporator being controlled by the AKC 16x AKC 16x refers to AKC 161 AKC 164 or AKC 165 controller...

Страница 59: ...ations 2 From the Communications Menu select I O Network 3 From the I O Network Menu select Re scan Re scanning the network can take several minutes After the re secan return via the Main Menu to the...

Страница 60: ...e set using the buttons on the EKC The installer should provide a list with the address for each fixture If such information is not available obtain the address at the fixture from the EKC by using th...

Страница 61: ...is done from the Degree Master Controls Board Points screen From any Configuration Board Points Other Controllers screen select the Degree Master Icon and press ENTER This screen appears Our example...

Страница 62: ...from the display After starting the locate procedure from the SC 255 keypad it is possible to activate the service pin from the Degree Master s display Press and hold both buttons for 3 seconds When t...

Страница 63: ...ield press to change to edit mode then use the left and right arrow keys to move from space to space and the up and down arrow keys to select the character for that space When the name appears as you...

Страница 64: ...n Menu Evaporator Menu shown above on the right are as follows No of HVAC Units 0 to 45 The number of controlled HVAC units of all types in the store No of phase loss monitors 0 to 45 The number of ph...

Страница 65: ...5 The unit is controlled by a Danfoss or ECI ClimaTECH 65 controller CT 1024 The unit is controlled by a Danfoss or ECI ClimaTECH 1024 controller Carrier The HVAC unit is a Carrier Centurion or Carrie...

Страница 66: ...will run on demand during closed hours On demand means that the fan will run whenever conditions calling for heating heat reclaim cooling dehumidification or venting are met Post delay 0 to 60 The nu...

Страница 67: ...l be based on the lowest value of all of the supply air temperature sensors Max Temp Display will be based on the highest value of all of the supply air temperature sensors Average Display will be bas...

Страница 68: ...ist Control will be based on the single selected temperature sensor Num of cooling stages 0 to 6 The number of cooling stages in this HVAC unit Target temp for stage 0 0 to 99 9 A separate field for e...

Страница 69: ...he suction pressure for the cooling compressors in this rooftop should be used No cooling above 0 0 to 100 0 The pressure value of the sensor selected on the previous line at and above which cooling w...

Страница 70: ...ing page s reached by using the PG DN key RTU Heating configuration Heating configuration for rooftop units begins with selection of Heating from the rooftop configuration menu Number of zone sensors...

Страница 71: ...ere is to be a night setback for heat Night setback offset 0 0 to 50 0 The amount by which the heating setpoint set on previous page is to be lowered during times when night setback is scheduled Overr...

Страница 72: ...turned off There is one field for each stage Lockout aux ht in setbk List box Yes No Whether or not auxiliary heat is to be locked out during hours when setback is effective Ambient heat lockout List...

Страница 73: ...Auxiliary heat will be locked out above this temperature plus range next line Heat will be allowed on again when ambient temperature has fallen to lockout minus range Range 0 0 to 999 9 The range sele...

Страница 74: ...t target which will be compared with a dewpoint calculated from inside zone temperatuare and humidity Both zone temperature and humidity sensors must be installed Inside Dew Dehumidification will be c...

Страница 75: ...bove Target differential 0 1 to 15 0 The differential forms a deadband above and below the target in which no control actions are taken Dehumidification will be turned on at target plus differential a...

Страница 76: ...umber of night setback schedules desired on the following schedule page s RTU Air Damper configuration For air damper configuration select Air Damper from the Configure RTU menu Air Damper List box Ye...

Страница 77: ...VAC fan down for each fan speed HVAC phase loss for this unit s phase loss detector HVAC smoke for this unit s smoke detector HVAC fire for this unit s fire detector RTU Board Points configuration See...

Страница 78: ...t box Continuous The fan will run continuously during hours when the store is not open Store open hours are defined in the Store Info screens On demand The fan will run on demand during hours when the...

Страница 79: ...pm at max speed 1 to 9999 The rated maximum speed of the fan motor from the data plate Second page AHU Fan Configuration Reaction Time 1 to 20 This setting together with the next regulate the sensitiv...

Страница 80: ...n Temp Control will be based on the lowest value of all of the supply air temperature sensors Max Temp Control will be based on the highest value of all of the supply air temperature sensors Average C...

Страница 81: ...d Target temp for stage 0 0 to 100 0 One target per cooling stage excluding outside air coil stages The target temperature that you want the first stage to maintain at the zone sensor Range 0 0 to 9 9...

Страница 82: ...demand The fan will run on demand during hours when the store is not open whenever heating cooling dehumidification or venting is called for Post delay 0 to 60 The number of minutes the fan will run a...

Страница 83: ...by an decrease in load Variable Output range List box 0 5 Volts Sets the RTC board s analog output for a variable speed drive requiring 0 5 volts 0 10 Volts Sets the RTC board s analog output for a va...

Страница 84: ...et temperature for the highest of a number of zone temperature sensors Zone 1 etc each supply zone temperature sensor will be available as a choice in the list Control will be based on the single sele...

Страница 85: ...there will be no offset of target temperature Full 99 9 to 99 9 The relative humidity above which the maximum offset of target temperature by humidity will be applied Ambient temp lockout List box Yes...

Страница 86: ...f the target is 72 and the range is 2 the stage will come on at 70 and will not be turned off until the temperature reaches 72 The pre delay and post delay must also be satisfied Target temp for stage...

Страница 87: ...are two pages of dehumidification configuration settings Dehumidification type List box None Cooling The type of dehumidification used Aux heat during dehumid List box Yes No Whether or not auxiliary...

Страница 88: ...s that must elapse after target minus range is reached before the stage will be turned off There is one field for each stage Cooling low limit 0 0 to 100 0 The temperature at and below which dehumidif...

Страница 89: ...ity control will be based on the highest of two humidity sensors Zone 1 etc each zone humidty sensor will be available as a choice in the list Enthalpy or humidity control will be based on the single...

Страница 90: ...Danfoss trained techni cian RTC schedules The RTC schedules screen s allow entry of schedules for operation of the rooftop RTC alarm configuration Alarms can be for any of the following in accordance...

Страница 91: ...t The names are fixed since the hardware points on the RTC board are dedicated and can control only a single type of device as follows Point 1 Fan Point 2 Economizer Point 3 Cool 1 Point 4 Cool 2 Poin...

Страница 92: ...here the address of the point that is to be received Configuring RTC I O on off inputs Here is the screen for on off digital inputs reached with the third icon from left Note that the screen is divide...

Страница 93: ...names always appear as in the illustration above whether the input is used or not Bcast List field one for each point No The input is not configured or its state is not to be used by the controller R...

Страница 94: ...nd can serve only for the listed outputs The names always appear as in the illustration above whether the input is used or not Range List field one for each point 0 10 Volt The output will supply 0 10...

Страница 95: ...have some unique configuration requirements For these units select SC4 as the type on the Configure HVAC menu At left below is the SC4 menu At right is the screen for fan configuration Motor delay ti...

Страница 96: ...e of all the zone temperature sensors Zone Temp 4 1 etc each zone temperature sensor will be available as a choice in the list Control will be based on the single selected sensor Num of cooling stages...

Страница 97: ...turned on before the next stage can be turned on SC4 heating configuration No of zone sensors 0 to 5 The number of zone temperature sensors Controlling sensor List box Min Temp Control will be based o...

Страница 98: ...ge for the lockout Heating will be locked out at lockout plus range and when locked out will be allowed on at lockout minus range Minimum run time 0 to 20 The number of minutes that a stage must run b...

Страница 99: ...e is to be a lockout based on low ambient temperature No dehum below 0 0 to 100 0 The ambient temperature below which dehumidification will be locked out Range 0 0 to 9 9 The range for the lockout Deh...

Страница 100: ...fans List box None Six Eight The number of HVAC condenser fans controlled in this unit Minimum run time 0 to 60 The number of minutes that a stage must run before being turned off Liquid Temp Setpoin...

Страница 101: ...control capacity The ClimaTECH configuration menu appears below There are two fan configuration screens depending on whether the fan is fixed speed or variable speed Fan type List box Fixed Speed Vari...

Страница 102: ...rated fan speed allowed Heat Dehumid fan speed 0 0 to 100 0 The percentage of rated fan speed during dehumidification or heating Shutdown on fire alarm List box Yes No Functional only if the fire alar...

Страница 103: ...pied setpoint 0 0 to 150 0 The heat reclaim setpoint during store closed hours as configured in the Store Info screen Lockout above ambient 0 0 to 150 0 The outside ambient temperature above which hea...

Страница 104: ...uxiliary heat is on Valve delay 0 to 99 The number of seconds after the enabling relay turns on before the analog valve can open ClimaTECH dehumidification configuration Num of stages 0 to 6 The numbe...

Страница 105: ...onomizer configuration Economizer List box Yes No Whether or not there is an econo mizer function in the HVAC unit Outside ambient target 40 0 to 150 0 The target The number of stages of auxiliary hea...

Страница 106: ...ure etc or on off state can be set for each alarm ClimaTECH schedule configuration Because the ClimaTECH can function as a stand alone it contains its own schedules They are set for each day and holid...

Страница 107: ...screens to allocate these An input or output number from 1 up to the limit of the controller is entered under the stage number in the case of relay outputs ClimaTECH sensor inputs Zone temp group 0 to...

Страница 108: ...TP1 OI The input is an on off input 0 10 Volts This type can be used for any sensor whose output is linear from 0 10 Volts Function List box Control Monitor For zone sensors only whether the point is...

Страница 109: ...ClimaTECH controller Go to the controller and depress the service pin After completing the Locate procedure place the cursor on the Init field and press ENTER Uploading to the AK2 SC 255 If the Clima...

Страница 110: ...ch Num of schedules 0 to 8 The number of operating schedules entered on the following page s Config List box No Rec No The sensor is not used Rec A sensor value is received from the system s I O netwo...

Страница 111: ...r of Cutler Hammer Pow R Line C Switchboard lighting panels to be configured Zones share photocells List box Yes No Whether or not multiple photocells are to be shared Number of photocells 0 to 8 The...

Страница 112: ...The number of schedules for this point Photocell List box Inside The point s photocell s are indoors Outside A single photocell is located outdoors None This point has no photocell Control sensor List...

Страница 113: ...level Photocell range 0 to100 The number of percent from night to day Trip Level 0 to100 The level at which the photocell condition will be true and act to turn the lights on If multiple relays are co...

Страница 114: ...a moni tored burglar alarm is sensed Pre delay 0 to 600 When this zone s lights are off and a burglar override is called for the number of minutes delay before the zone is turned on Fire override Lis...

Страница 115: ...erlink panels require that you put the cursor on the Locate field and press enter A popup box will appear on the screen instructing you to press the service pin on the breaker panel You will have a fe...

Страница 116: ...ight below Continuing select Configure from the Utility Meter Menu and press ENTER Now the Utility Meter Configuration menu appears as shown below Enter the number of meters to be configured and a lis...

Страница 117: ...s entered here are the same as the values entered at the meter Number of CT sets EMON only 0 to 5 The number of meters sets of current transformers connected to this meter Wattnode assumes a single se...

Страница 118: ...meter The page looks like this The fields in the screen are these Maximum emergency load Demand limiting only 0 to 99999 Enter the upper demand limit that you do not wish to exceed when the emergency...

Страница 119: ...ll be turned on when the emergency generator starts A level will be added each minute unless the specified emergency load for shedding to start is reached Coupling begin level Emergency generator cont...

Страница 120: ...o be used for demand limiting and enter the parameters then select the loads to be shed for limiting demand and give each a priority In order to use demand limiting you must have a Danfoss approved ut...

Страница 121: ...by the number of steps allowed Levels above the number of steps configured will not be shed unless the meter configuration is changed Since there are only up to ten steps loads assigned level 11 will...

Страница 122: ...are skel eton in nature This means that the alarms are now allocated in the program but you should inspect the alarm actions trip levels and time limits for each alarm and adjust them accordingly to m...

Страница 123: ...C and another submenu will appear listing all the different parts of the system for which we can configure alarms Note the last item on the menu at right above Bitzer This appears only because when th...

Страница 124: ...nfiguration settings if any will remain in memory for future activation All alarms are in this state initially until you change them Adescription of each enabled alarm action follows Log Only The occu...

Страница 125: ...ary to be authorized for refrigeration functions or the higher Supervisor level To suspend rack alarms select Refrigeration from the Main Menu then select the rack being serviced from the refrigeratio...

Страница 126: ...vel for the alarm move the cursor to the next changeable field Because we are configuring a digital alarm that is constrained to a value of On the only remaining fields we can change are for the time...

Страница 127: ...ult alarm pressure and time settings that appear as soon as the alarm action level is changed to something other than disabled In the screen at right above we have moved cursor first to the pressure s...

Страница 128: ...nd low suction pressure alarms Start by considering the target pressure that is configured for the rack Know the range of pressures that the rack will operate in when loads product temperatures defros...

Страница 129: ...to 9999 seconds minutes or hours High Pressure if a suction pressure sensor is configured An analog alarm set for a pressure from 999 9 to 999 9 psi or bar and a time limit of from 1 to 9999 seconds...

Страница 130: ...econds minutes or hours High Temperature if a discharge temperature sensor is configured An analog alarm set for a temperature from 999 9 to 999 9 degrees with a time limit from 1 to 9999 seconds minu...

Страница 131: ...nt sensor temperature appears along with the number of the I O board and point to which the case temperature sensor is wired At first you see two alarms both disabled In the screen at right above we h...

Страница 132: ...and by having configured a miscellaneous point for the switch which is then wired to that point The logic written for the miscellaneous point will prevent alarms after the switch is operated for the t...

Страница 133: ...a tion of defrost and the specified temperature is not reached before the time set for fan delay expires Drip pan clogged Occurs when a clogged drain is sensed due to standing water in the fixture dri...

Страница 134: ...ve only the first page of alarms Depending on the number of fans there may be additional condenser fan failure alarms on a second page High Pressure discharge pressure sensor This same alarm appears o...

Страница 135: ...nutes or hours Low liquid level if a liquid level sensor is configured An analog alarm that occurs when receiver liquid level has fallen below water temperature is below a set percentage but values fr...

Страница 136: ...m the Main Menu select Configuration then Alarms then HVAC The alarm configuration menu is shown at left below When you select HVAC from the alarm configuration menu a list menu headed Configure HVAC...

Страница 137: ...period of from 1 to 9999 seconds minutes or hours High humidity Occurs when zone humidity is above a set percentage the field takes values from 999 9 to 999 9 for a period of from 1 to 9999 seconds mi...

Страница 138: ...er elapsed Occurs when the set number from 1 to 9999 seconds minutes or hours have elapsed Useful when set for the system air filter life as a reminder to change the filter Filter runtime Occurs when...

Страница 139: ...controller has a digital input to detect failure of the HVAC system s inverter if the system is a variable speed unit This alarm occurs when the inverter has been called for for the specified alarm de...

Страница 140: ...ight The first icon represents relay outputs the current screen The others from left to right are in reverse video unselected and represent analog inputs digital inputs analog outputs and casc control...

Страница 141: ...cursor is by default on the Number of alarms field We can enter any number from 0 to 3 We want to configure only one alarm Entering 1 in the Number of alarms field produces the screen at left below Be...

Страница 142: ...there are any miscellaneous points already configured First select Miscellaneous from the Main Menu Select Configuration and the Configure Miscellaneous Menu appears The calculated points feature of S...

Страница 143: ...scellaneous calculations section which follows in a few pages Miscellaneous on off inputs You can configure up to 64 miscellaneous on off inputs per SC 255 To configure miscellaneous on off inputs sel...

Страница 144: ...a full complement of argument types and operators Examples follow this section Right now let s investigate the screens one by one as far as we can in general If there are no calculations configured w...

Страница 145: ...first displays showing all the types of points that can be created and for SI points units For the purpose of discussing the screen let s assume that we are creating an OI a digital input We select O...

Страница 146: ...essor room temperature is 90 F or higher we also want it to run in case of a refrigerant leak of 500 ppm or more So let s list the types and values we will need OI calculated point to control the RO S...

Страница 147: ...point for the miscellaneous RO we created Notice the Undo and Cancel button fields in the heading of the screen Undo will erase your last step if you make a mistake Cancel will undo all changes leavin...

Страница 148: ...d for the sensor changes from error to 0 0 F Still in the data definitions area select the blank in the second line under Name and open the list box This time select Number F from the list be careful...

Страница 149: ...t left below Toggle to edit mode and as you can see at right the opportu nity to insert a new line presents itself Now press ENTER and the new line appears On the new line create argument SI3 an SI pp...

Страница 150: ...l mathematical operators appropriate to sensor inputs We will select as the operator for this statement Having done that move one field to the right and select Num2 as the argument to complete the sta...

Страница 151: ...line There must be one true state ment called the else statement by logicians So the last line always states True with the result set to whatever state we want when none of the other conditions is tr...

Страница 152: ...t Name Label any 15 characters Edit the field to read appropriately to the purpose Bcast List box No Send Rec Leave the Bcast field set to No We are not going to use the point elsewhere on the network...

Страница 153: ...o things to add to configuration here Control Input List box all configured OIs Our new calculated OI is found at the bottom of the list Use the three dots at the top or bottom to move up or down the...

Страница 154: ...ulated point Higher numbered points will remain in place The deleted point will be the next new point made available for configuration Style To understand the various styles of Calculated SI and OI po...

Страница 155: ...undo or cancel and reverses that action Configuring Authorization Only users authorized at the Supervisor level have sufficient access to configure authorization Supervisors can select Authroization...

Страница 156: ...Store Info from the Main Menu then Units Languages This is the screen that displays The fields are these Pressure List box PSI bar Temperature List box F C Date List box four date formats are offered...

Страница 157: ...156 AK2 SC 255 Reference Manual RS 8D M1 22...

Страница 158: ...if it isn t the screen you see on the controller by pressing the MENU key Here s the Main Menu Authorization Just Looking If you are just looking at information in the system you may not need to enter...

Страница 159: ...Authorization from the Main Menu This is the screen that will appear Notice that the current level of access probably View only will be seen at the top of the screen The cursor will be in the Auth fie...

Страница 160: ...h the Units Languages screen which looks like this The fields in the screen are these The selections are self explanatory Pressure List box psi bar Temperature List box F C Date List box a choice of 4...

Страница 161: ...ration menu many be different In this menu there is some status information displayed the current suction pressure and for reference the target suction pressure Since there is more than one rack being...

Страница 162: ...AA we ll see our first detailed status screen Notice that there is a row of icons across the bottom of the screen The cursor is on the third icon suction which is shown in reverse video From left to r...

Страница 163: ...have left the menu to enter the main body of the screen you can return to the icon menu by pressing the MENU key When using a PC you can back up one screen by clicking in the screen title area Viewing...

Страница 164: ...and use the icon menu to enter the Suction Schedules screen Press MENU to return to the icon menu at the bottom of the screen Move the cursor to the schedules icon which looks like a clock face with...

Страница 165: ...of such a field and describe how to change it we will go back to the Main Menu and select Store Info then Holidays Changing names was covered in Chapter 5 7 but we ll repeat the information here The...

Страница 166: ...maintenance Typical is the Suction Service menu reached by selecting the service icon from a Suction Status menu Auto Manual Relays The first two selections are similar Select Auto Manual Relays and a...

Страница 167: ...the arrow keys to change the field and then press ENTER Reset In the center at the bottom of the screen is a Reset field If you place the cursor on this field and press ENTER all relay outputs will b...

Страница 168: ...e value the sign will not change until you enter the first numeral from the keypad You can only offset a real sensor you cannot enter an offset for a reading being received from another controller And...

Страница 169: ...t AKV valves Fixture temperature is below target range minimum The valve percentage will hold at zero closed The evaporator will remain in this status until fixture temperature rises to target when th...

Страница 170: ...rns the dynamics of the evaporator and optimizes internal parameters for the modulated control function After fixture temperature reaches its target if that target is between 23 F and 50 F and after a...

Страница 171: ...for a maximum of two minutes to establish minimum superheat When fan delay is finished and minimum superheat is reached status will change to Cut in After drip down KVQ valves operate normally until...

Страница 172: ...hut down using the service screen either for case cleaning or other service The screen at left below is the second page of an evaporator status screen Evaporator Settings Smart Case Control If you sel...

Страница 173: ...ation the defrost will be skipped Evaporator Schedules Smart Case Control The schedules screen for an evaporator shows the number of defrost scheduled per day the duration and the start time for each...

Страница 174: ...r Maxi mum Time which is the maximum time a system can remain in defrost whether or not a selected termina tion temperature has been reached There are two fields which control the mode of the fixture...

Страница 175: ...circuits with Smart Case Controllers Evaporator Status Screen The status screen for an SC 255 circuit is reached from the main menu by selecting Refrigeration then the Rack then Evaporators then the e...

Страница 176: ...ttings Screen The settings screen reached by selecting the settings icon at the bottom of the screen shows and allows changes to settings for refrigeration and defrost Evaporator Schedules Screen The...

Страница 177: ...menu will appear Host Network Screen The Host Network screen shows the address of the current 255 the number on the network and the status Online or Offline of each Our example below shows o0nly one...

Страница 178: ...tton the screen at right above appears List Points Select List Points from the I O Network Status Screen and this is the screen that appears The fields and their contents are as follows Bd Pt The addr...

Страница 179: ...left of the body of the screen above the icons on the same line as PG DN for more is the SORT field By default sort mode is On and entries will be sorted by Bd Pt address If sort mode is turned Off p...

Страница 180: ...trollers List Nodes The List nodes screen reached from the I O Network Status menu looks like this The list nodes screen shows the type address and status of every node on the I O network In the sampl...

Страница 181: ...d is an IP address and is the address of the ethernet node to which alarms are to be sent The IP address is assigned by your network administra tor The address is composed of four one two or three dig...

Страница 182: ...e numbers one or both of the IP network addresses to one of up to three OAB s to a local printer or to any combination of destinations The destinations are indicated by the column heads and subheads a...

Страница 183: ...and each Alarm Box are correct For alarm boxes the SC 255 where the alarm box is installed must have a relay output board and point assigned for the box Printer Settings Screen To receive alarms a se...

Страница 184: ...ese schedules is true Up to three standard schedules can be set up In order to activate the schedule it is necessary to toggle the field reading Not Used to Standard Then the schedule settings will ap...

Страница 185: ...the proper commands If the modem was supplied by Danfoss instructions will accompany it or you may call Danfoss Technical Support for assistance Baud Enter the transmission speed in baud or bits per...

Страница 186: ...the line being used This is the number you would dial on this line using a telephone instrument to reach the destination Up to twenty characters can be entered The following special characters have t...

Страница 187: ...type of receiving device either Printer or AKA 65 Init An extra initialization string which may be needed for some modes of communication Default is AT The entry is user editable Date The date format...

Страница 188: ...ve Remember to toggle edit mode for each line by pressing the key and press ENTER at the end of each line 2 6 Using the History Screens for History Retrieval To view history select History from the Ma...

Страница 189: ...eld to Yes and press ENTER Note that this can only be done if there are not five points already selected and shown in the upper portion of the screen If all five positions in the upper portion of the...

Страница 190: ...emain unaf fected Also see the paragraph on Auto View following the next illustration Clear Clears the column labeled view in all the Configure History Display screens for all the points represented b...

Страница 191: ...croll field regulates how much of the screen will be scrolled when you press one of the small arrow buttons in center bottom of the screen The selections possible are Full for full screen scroll Half...

Страница 192: ...x settings on the bottom line of the display Min can be any multiple of 10 from 90 to 90 Max can be any multiple of 10 from 80 to 500 Time The times given at left and right below the graph are the beg...

Страница 193: ...ay of statistics for the four points selected The statistics given depend on the type of point whether on off relay outputs on off inputs or variable sensor inputs variable outputs calculated values H...

Страница 194: ...but whose condition is no longer out of bounds whether or not the alarm has been acknowledged Any cleared alarms among the most recent 100 alarms will be displayed in the Cleared Alarms screen Alarm S...

Страница 195: ...e alarm Two fields on the right of the screen deserve special explanation Now The present status of the alarm condition For system alarms mo dem I O comm Test Alarms etc the field will read Trip For a...

Страница 196: ...ion that appears in the top blue border of every SC 255 screen will be turned off 4 The Ack field in the Active Alarms screen or the Cleared Alarms screen will be changed to Yes 5 In the detailed alar...

Страница 197: ...100 active and cleared alarms for all the SC 255 s in the network The format of the screen is the same as the format of the Active Alarms screen and the Cleared Alarms screen which are discussed above...

Страница 198: ...on in this SC 255 only Send Test Alarm Sends a single test alarm The Generate system test alarm function see below must be enabled Generate system test alarm Provides a means of generating a test alar...

Страница 199: ...et switches on RO8S boards the Manager s Override box and the keyswitch override Overrides Using Service Screens A typical service screen is the one for relay output boards There is a similar screen f...

Страница 200: ...and common terminals Output LED s Each output has a pair of LED s one red and one green The red LED lights whenever its relay output is overridden The green LED lights whenever the relay coil is energ...

Страница 201: ...he Audit Trail The SC 255 audit trail is a log that shows each system access together with any changes to configuration or settings that were made during the access The audit trail log shows every sys...

Страница 202: ...and only the supervisor level should see authorization codes If a supervisor wants to see the codes the authorization configuration screen to which no one else has access will show them all At the sa...

Страница 203: ...one entry back ward in time an operator that moves the screen one page back ward in time 00001 shows the oldest entry in the audit trail database When the database is filled to capacity the next entr...

Страница 204: ...RS 8D M1 22 AK2 SC 255 Reference Manual 203...

Страница 205: ...204 AK2 SC 255 Reference Manual RS 8D M1 22...

Страница 206: ...Danfoss Refrigeration Air Conditioning Division 7941 Corporate Drive Baltimore MD 21236 Tel 410 931 8250 Fax 410 931 8256 Direct Order Fax 410 931 0677 www acr danfoss com RS 8D M1 22 Danfoss 2005...

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