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RS.8D.M2.22

AK2-SC 255 Reference Manual

14

egory right after we talk briefly about the other “route” configuration may take.

Starting with a
Completely
Un-configured
AK2-SC 255

If the AK2-SC 255 you are working with has no refrigeration configuration at all,
select Refrigeration from the Main menu, and the Rack Configuration menu will
appear (left).  The only selection which can be made from this screen is Add Rack.
Selecting Add Rack takes you to the Configure Rack, Rack Info screen (right).

Navigation and
making changes

The Configure Rack A screen shown at right above has information fields that can be
changed by any user with a proper authorization code.  To make changes, use the
arrow keys to move the cursor to the field you want to change

Entering numerals

To enter numerals for a field like No of suction groups, use the numeral keys on the
controller  keypad., then press ENTER.

Entering labels

Labels are 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 or words indicating the oil type, for example,
“Mineral.”

To enter a label, place the cursor on the field, then press the +/- key. This action
toggles the function of the arrow keys so that the UP and DOWN  arrows scroll
through the alphabet and all the other possible characters.  Once the character you
want in that space appears, use the RIGHT arrow to move to the next space (when
the field has more than one space).  Again, use the UP and DOWN arrows to reach
the character you want. When all the characters in the field are as you want them,
press ENTER to save the entry.

Constrained fields

The Rack label field is a constrained field. It will only accept an upper case letter,
even though lower case letters appear as you scroll through the characters. The No
of suction groups
 field is also constrained. It will only accept a single numeric
character from 0 to 5, because a single AK2-SC 255 can control up to 5 suction

Summary of Contents for AK2-SC 255

Page 1: ...RS 8D M2 22 AK2 SC 255 Reference Manual 1 AK2 SC 255 Rack Controller System Reference Manual...

Page 2: ...RS 8D M2 22 AK2 SC 255 Reference Manual 2...

Page 3: ...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...

Page 4: ...sors 20 22 Compressor oil and 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 refr...

Page 5: ...66 69 RTU heating configuration 69 72 RTU dehumidification configuration 73 75 RTU air damper configuration 75 76 RTU alarms configuration 76 RTU board points configuration 76 AHU Configuration 76 80...

Page 6: ...nfiguration 110 114 Beginning configuration 110 AK2 SC 255 lighting zone setup 110 113 Board points configuration lighting 113 Powerlink configuration 113 Cutler Hammer configuration 113 Powerlink and...

Page 7: ...llaneous on off inputs 142 Specifying miscellaneous conversiosn 142 143 Miscellaneous calculations 143 144 Point creation 144 145 Custom strategy example 145 153 Creating the miscellaneous points Sens...

Page 8: ...en Evaporator Alarms screen and Evaporator Service 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...

Page 9: ...rence Manual 9 Overriding sensor values 199 Overrides using RO8S switches 199 Overrides using the Manager s Override box 199 200 Keyswitch Override for refrigeration high temperature alarms 200 2 9 Us...

Page 10: ...RS 8D M2 22 AK2 SC 255 Reference Manual 10...

Page 11: ...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...

Page 12: ...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...

Page 13: ...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...

Page 14: ...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...

Page 15: ...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...

Page 16: ...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...

Page 17: ...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...

Page 18: ...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...

Page 19: ...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...

Page 20: ...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...

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