Danfoss AK-CC 550 - Rail Heat, Fan, and Light Control

AK-CC550 Manual RS8EN502 © Danfoss 02-2010 9
Fan
Pulse control
Toobtainenergysavingsitispossibletopulsecontrolthepower
supplytothefansattheevaporators.
Pulsecontrolcanbeaccomplishedinoneofthefollowingways:
-duringthethermostat’scutoutperiod(coldroom)
-duringnightoperationandduringthethermostat’scutoutpe-
riod(appliancewithnightlid)
A period of time is set as well as the percentage of this period of
timewherethefanshavetobeoperating.
Cutout of fans during plant breakdowns
Iftherefrigerationinabreakdownsituationstops,the
temperatureinthecoldroommayrisequicklyasaresultofthe
powersupplyfromlargefans.Inordertopreventthissituationthe
controller can stop the fans if the temperature at S5 exceeds a set
limitvalue.
Light function
The function can be used for controlling the light in a refrigeration
applianceorinacoldroom.Itcanalsobeusedforcontrollinga
motorised night blind.
Thelightfunctioncanbedenedinthreeways:
-thelightiscontrolledviaasignalfromadoorcontact.Together
withthisfunctionatimedelaycanbesetsothatthelightiskept
on for a period of time after the door has been closed.
-thelightiscontrolledviatheday/nightfunction
-thelightiscontrolledviathedatacommunicationfromasystem
unit.
Heretherearetwooperationaloptionsifdatacommunication
should fail:
-ThelightcangoON
- The light can stay in its current mode.
The light load must be connected to the NC switch on the relay.
This ensures that the light remains on in the appliance if power to
the controller should fail.
Thelightisswitchedowhen"r12"(Mainswitch)issettoo(see
o98).
Thelightisswitchedowhentheappliancecleaningfunctionis
activated.
Night blind
Motorised night blind can be controlled automatically from the
controller. The night blinds will follow the status of the light
function.Whenthelightisswitchedon,thenightblindsopens
andwhenthelightisswitchedo,thenightblindscloseagain.
Whenthenightblindsareclosed,itispossibletoopenthemusing
aswitchsignalonthedigitalinput.Ifthisinputisactivated,the
nightblindswillopenandtherefrigerationappliancecanbelled
withnewproducts.Iftheinputisactivatedagain,theblindsclose
again.
Whenthenightblindfunctionisused,thethermostatfunction
cancontrolwithdierentweightingbetweentheS3andS4
sensors. A weighting during day operation and another when the
blind is closed.
A night blind is open when the appliance cleaning function is
activated.
Asettingcandenethatthenightblindisopenwhen"r12"(Main
switch)issettoo(seeo98).