Programmable Solar Charge Controller with Negative Ground
Contents
1. Threshold setting range 771154V L _ Switching point day gt night Switching point night gt day 4919 8 factory setting 1 0 20V Curve of open circuit voltage solar array The two voltage levels before after the slash are valid for 12 V and 24 V systems respectively To find the right value we recommend measuring the solar array open circuit voltage at the time when twilight has reached the level when the controller should switch on off This value the closest available can then be set according to the description in the programming section Programming Lock out By pushing the programming button for 8 s in normal operation mode the programming lock out is activated to prevent any accidental settings change Another 8 sec push releases the lock out Programmable Solar Charge Controller with Nightlight Function CXN10 1 1 CXN20 1 1 CXN40 1 1 J User Manual English Page 2 phocos Optional Functions S WARNING The combination of different errors may cause damage to the State of Charge Main Menu Display Menu Programming Menu f2. Menu 8 Serial interface BIDIRECTIONAL NO EXCESS EN Controller is ventilation of m ARP x ERGY is also default setting the behaviour could modified thermally controller AE E N Neteghefnespn Loads are not overloaded and After cooling down External Temperature Sensor CXNT supplied Flashes has disconnected the loads are es DESC TO DAWN With the optional temperature sensor CXNT CXN can measure the battery the loads reconnected w temperature and adjust the charging voltage accordingly to extend the automatically E A battery life span Check if other See CXNT manual for details Battery voltage sources overcharge RI Ndit function bd too high the battery If not You enter the programming mode with a long push 2s 8s on the button 915 5 31 0 V controller IS MEANING TER The programming menu structure is described as below amaged Battery wires or Night function Menu 1 Battery type battery fuse Check battery In this menu you can select the proper battery type liquid electrolyte or Bq damaged wires fuses and pete uenon GEL VRLA according to your PV system to get better charge of your battery ous battery has high battery APARE The default battery type is liquid electrolyte resistance akte neer Menu 2 Low voltage disconnect Battery is flat ane Battery has low Change battery 5 after short time sue capacity Nightight function In this menu you can set 5 different LVD modes to protect the battery from IG 5 HRS being
3. dry ground and keep your hands dry wl Neghlghe function MORNING Eei Or CAM Oei Intertace snoutd be propery seth Keep children away from batteries and the charge regulator ve eee i Nightlight function MORNING Menu 9 Individual factory settings ar oieerye the safety rerarimendatian of the battery as Pa OPRESI You can save your current menu setting or reset to default factory setting in GA Nightlight function MORNING i See PROM E HRS after mid of night this menu The manufacturer shall not be liable for damages especially on the battery Programming logout caused by use other than as intended or as mentioned in this manual or if the pd LRA Daria ee When you exit programming menu the controller displays the state of charge recommendations of the battery manufacturer are neglected The manufac gt available energy of the battery and the status of the load turer shall not be liable if there has been service or repair carried out by any Fr Davits treshold Mind that once you have entered the programming menu you can exit it at the last item only We therefore recommend that you first note down your required settings unauthorised person unusual use wrong installation or bad system design Opening case voids warranty Day
4. 9 mm head diameter no counter sunk Mind that the screws have to carry also the force applied by the wiring Mind also the minimum required distance to floor and ceiling this is necessary for ventilation reasons Remove the screws from the strain relief and take off the strain relief bridges A DIN Rail mounting plate is available as an accessory CX DR2 This allows mounting the controller on a standard 35mm DIN rail Use the screws supplied with the mounting plate to fix it to the controller Connect the wires leading to the battery with correct polarity To avoid any voltage on the wires first connect the controller then the battery Mind the recommended wire length min 30 cm to max approx 100 cm and the wire size CXN10 min 2 5 mm CXN20 min 4 mm CXN40 min 10 mm Wrong polarity will cause a permanent warning sound WARNING If the battery is connected with reverse polarity the load terminals will also have the wrong polarity Never connect loads during this condition REMARK The controller has a built in voltage drop compensation which automatically compensates battery wire voltage drops of up to 250 mV Connect the wires leading to the solar array with correct polarity To avoid any voltage on the wires first connect the controller then the solar array Mind the recommended wire size CXN10 min 2 5 mm CXN20 min 4 mm CXN40 min 10 mm REMARK place posi
5. A EDL IZLY Soat yolag polarity l Max wire size 16 mm AWG 6 iea PNAS Sige Yes if only the Load output is Self consumption 6 mA r gt j Reverse polarity Yes notat 24V battery is connected protected but Ambient temperature 25 to 50 C EN Day Night threshold system voltage H loads might be range p24 72 1 143V Solar voltage Acoustic Warning daniaged ge X i ged Case protection IP 22 le DayINighe threshold Unrestricted Subject to change without notice Version CXNO70606 i Short circuit Unrestricted bee ta inert Unrestricted Made in one of the following countries China Germany e feed Buzzer ON x P me Chae e0 by Phocos AG Germany www phocos com Bes B ue Buzzer OFF Overcurrent Controller limits Controller switches oe current off load terminal Ty Seral interface EXCESS ENERGY ry a sfa Thermal overload eaa EENE Controller switches Serial interface EXCESS ENERGY protected y off load terminal l ed A DATALOGGER 2 No connection Unrestricted Unrestricted Unrestricted ay Serial inrerface BIDIRECTIONAL 3 Reverse current Unrestricted asa rt Varistor 56 V Controller switches 4 gt yo Keep individual settings ANAE Overvoltage 2 3J Max 40 V off load terminal ge E Undervoltage Normal Controller switches Controller switches lee Roe eee re si operation off load terminal off load terminal
6. Night threshold 211 ABV Solr vokage in the check boxes beside the menu structure and then do the program Nominal voltage 12 24 V automatic recognition ae lies oie am ming in one go This makes programming easier and avoids errors Absorption voltage 14 4 28 8 V 25 C 0 5 2h ca All programming settings are stored in a non volatile memory and remain Equalization voltage 14 8 29 6 V 25 C 2h ra al Day ORY Solar voltage stored even if the controller was disconnected from the battery Float voltage 13 7 27 4 V 25 C ka 1080 cisconnect voltage 11 0 12 2 22 0 24 4V depending on setting SP weaves The controller is protected against wrong installation or use Head reconnect voltage wea a Sn age deceit a 2 l ay reshol At the solar At the battery At the load fone ure compensa mice Pee PRY Sobr volage terminal terminal terminal Max solar panel current 10 20 40 A according to model number 4 DayiNighe threshold x Battery connected i a 25 C without load current at 50 C mil with correct Unrestricted Normal operation Unrestricted Max load current 10 7 20 40 A according to model number eA Day Night threshold olarity Aaga y aye 557 119V Sobr vokage lis a 25 C without solar current at 50 C Battery connecte i i Dii i hxd 4a Day Night threshold ji F lUnrestricted Acoustic A imensions 89 x 90 x 38 mm w x h x d Rid V 121V Sobr vokage with wrong Unrestricted Warning Unrestricted Weight CXN10 CXN20 175 gr CXN40 186gr
7. Programmable Solar Charge Controller with Negative Ground CXN10 CXN20 CXN40 User Manual English Page 1 phocos Dear Customer Thank you very much for buying this Phocos product With your new CXN controller you own a state of the art device which was developed according to the latest available technical standards It comes with a number of outstanding features such as Multifunctional LC display Programmable Low Voltage Disconnect with new ALVD Adaptive Low Voltage Disconnect m Sophisticated programmable nightlight function m Excess Energy Management EEM for better utilization of your solar system Complete electronic protection Negative Grounding This manual gives important recommendations for installing using and programming as well as remedies in case of problems with the controller Read it carefully in your own interest and mind the safety and usage recom mendations at the end of this manual The charge controller protects the battery from being overcharged by the solar array and from being deep discharged by the loads The charging characteristics include several stages which includes automatic adoption to the ambient temperature The charge controller adjusts itself automatically to 12V or 24V system voltage m The pushbutton allows switching the load on and off manually m The charge controller can be programmed for lighting applications m The controller provides a control output for special loads that ma
8. al current CXN10 15A CXN20 30A CXN40 50A gt 80 60 80 35 60 10 35 lt 10 Load Disconnect Ra A pec peo pe CONGO qa Gee ge ge g The percentage corresponds to the available energy until Low Voltage Disconnect in relation to a fully charged battery As long as the solar array supplies enough voltage to charge the battery this is indicated by up moving bars alternately to the state of charge display In normal operation the loads can be switched on and off by pushing the button This is indicated in the display Load Load manualy ON manually O FF a Special conditions are shown in the LC display if the Low Voltage Disconnect function shuts off the load output or in case of various other error conditions See section ERROR DESCRIPTION for details Acoustics Signals The controller has an acoustic signal which indicates the change of the state of charge This function can be deactivated in Programming Menu 7 Low Voltage Disconnect Function LVD The controller has 5 different modes to protect the battery from being deep discharged Mode 1 Disconnect at 11 4 V at nominal load current up to 11 9 V at no load current Normal operation mode for good battery protection Disconnect at 11 0 V at nominal load current up to 11 75 V at no load current Mode with lower disconnection point Battery is cycled deeper this can shorten battery lifeti
9. deep discharged Please see section DESCRIPTION OF FUNCTIONS for Battery isnot No up Solar array faulty Check Solar array being charged moving M Nightight function EVENING details dia dai b or wrong polarity and wiring TO A HRS before mid of night The default low voltage disconnect LVD setting is Mode 1 Disconnect at uring daytime ars Battery i 11 4 V at nominal load current up to 11 9 V at no load current Battery wrong Permanent AEA Si Remove reverse TE SAR Before ma of nghe Menu 3 Nightlight function type polarity sound reverse polarity polarity igh fonction EVENING In this menu you can set the type of nightlight function or switch off the Controller is Mount controller at TERRE betore mid of ole nightlight function of your CXN controller thermally a location with igh fungon EVENING The default setting of nightlight function type is OFF Controller timits g overloaded better ventilation Te eee ee Menu 4 Nightlight function evening settings solar current Flashes 5 ot baa Check solar array Dre et agi EVENING When the nightlight function type is set to EVENING MORNING mode you can current of current gt POETA set the load ON hours after sunset in this menu controller ENA oe MORRING OFF x The default load ON hours after sunset is 0 hr hi AER Menu 5 Nightlight function morning settings Intended Use x MORNING I HR When the nightlight function type is set to EVENING MORNING mode you can The charge regulator is intended for u
10. he CXN controller comes with a sophisticated nightlight function It controls the load output at night and is widely programmable There are 2 modes available DUSK TO DAWN and EVENING MORNING The mode can be selected in Programming Menu 3 Mode 2 Mode 3 Mode 4 Mode 5 Light on a Dusk to Dawn gt Light off Mid of night Morning Timing Evening Timing Light on Light off or of hours of hours 4 A gt VA 4p If EVENING MORNING is selected allows choosing the MORNING timing behaviour and allows choosing the EVENING timing behaviour Mind that the load output is switched off as soon as the battery has reached the Low Voltage Disconnect threshold The Low Voltage Disconnect has priority above the nightlight function Mid of night is detected automatically as the middle between dusk and dawn no real time setting is required It may take some days until the controller has learnt midnight This method can cause some inaccuracy but avoids any clock readjustment The controller s Mid of night can be different from the real time midnight depending on your location The controller recognizes day and night based on the solar array open circuit voltage In Programming Menu 6 this day night threshold can be modified according to the requirements of the local conditions and the solar array used 3 WA mid of night mid of night
11. ke use of excess energy such as Phocos DCL DC voltage converter Additionally it has a serial interface which can be used with an optional interface adapter CX 1 The charge controller has a number of safety and display functions The regulator warms up during normal operation If there is insufficient ventilation e g in an installation cabinet the controller limits the solar charge current to prevent overheating The regulator does not need any maintenance or service Remove dust with a dry tissue It is important that the battery gets fully charged frequently at least monthly Otherwise the battery will be permanently damaged A battery can only be fully charged if not too much energy is drawn during charging Keep that in mind especially if you install additional loads The controller is intended for indoor use only Protect it from direct sunlight and place it in a dry environment Never install it in humid rooms like bathrooms The controller measures the ambient temperature to adopt the charging voltage therefore it must be installed in the same room as the battery The controller warms up during operation It shall be installed on a non flammable surface only REMARK Connect the controller by following the steps described below to avoid installation faults Open the terminal lid Mount the controller to the wall with screws that fit to the wall material Use screws with 4 to 5 mm shaft and max
12. lashing pastine ur Interface and Datalogger CXI and CXCOM controller Always remove errors before continue connecting the controller e i va y we m BaP ua xX The controller comes with a serial interface which can be connected to a PC Error Description ss W I t 3 with an optional interface adapter CX I see interface adapter manual for fn ye GREW RRRS details In Programming Menu 8 Serial interface BIDIRECTIONAL NO Error condition Display Reason Remedy Tad Solo E EXCESS ENERGY is also default setting the behaviour of the serial interface Load will reconnect R PIA ee He ra adanan iiA 9v 96 can be modified x Battery is low as soon a battery oT is recharged R Low voltage disconnect Remote Display CXM Switch offal loads ae current compensated 11 0 11 75V The CXM remote display is designed to display panel current load current and Remove short Von LVD current compensated battery voltage of your PV system and status values like charging overload Overcurrent circuit Controller a adaptive 110 122V low voltage disconnect as symbols Additional it can display several values of Short circuit of will switch on load we CXN s datalogger of the past 7 days such as Ah SOC Battery voltage morning loads automatically after we Pei EES deconsese tly evening This provides you more detailed information of your PV system max 1 minute N See CXM manual for details Check proper LEA foe E In Programming
13. me Disconnect at 11 0 V to 12 2 V depending on load current and previous charging cycles This adaptive mode leads to longer life time of the battery because it allows recovery of the battery by full recharge Maximum battery life Disconnect at 11 5 V fixed setting Appropriate if bypass loads draw current directly from battery Disconnect at 11 0 V fixed setting Appropriate if bypass loads draw current directly from battery Mode with lower disconnec tion point Battery is cycled deeper this can shorten battery life time The controller is preset to Mode 1 from the factory Use Programming Menu 2 to change the setting see back page In case of doubts which mode to choose consult your dealer because this has to be evaluated depending on the battery used Excess Energy Management Function EEM The controller provides a built in excess energy management function This function in combination with especially designed loads e g Phocos DCL DC voltage converter allows to make use of excess energy which would be lost otherwise because of the overcharge protection of the battery A better utilization of the solar system is the benefit Also the battery treatment is improved because more energy comes directly from the solar panel instead of the battery Ask you dealer about available loads that can make use of excess energy To connect your Excess Energy load with the controller see picture 8 signal wires Nightlight Function T
14. ray it starts a self test routine This is indicated first by running LCD bars for approx 0 5 seconds and then the firmware version is displayed in coded symbols for about another second this is for service purposes only Then the display changes to normal operation System Voltage The controller adjusts itself automatically to 12 V or 24 V system voltage As soon as the voltage at the time of start up exceeds 20 0 V the controller implies a 24 V system If the battery voltage is not within the normal operation range approx 12 to 15 5 V or approx 24 to 31 V at start up a status display according to the section ERROR DESCRIPTION occurs Battery Type The controller is preset to operate with lead acid batteries with liquid electrolyte If you intend to use a VRLA battery GEL type you can adjust the controller in Programming Menu 1 see back page The equalization charge is deactivated then In case of any doubts consult your dealer LC Displays In normal operation mode the controller displays the state of charge avail able energy of the battery Any change of the state of charge SOC to a lower status is additionally signalled acoustically System conditions are displayed as follows REMARK Mind the recommendations of your battery manufacturer We strongly recommend connecting a fuse directly to the battery to protect any short circuit at the battery wiring The fuse must take the charge controller nomin
15. se in photovoltaic systems with 12 V or Fe Nightlight function set the load ON hours before sunrise in this menu 24 V nominal voltage It shall be used with vented or sealed VRLA lead acid sze MORNING 2HRS The default load ON hours before sunrise is 0 hr batteries only Von Nightlight function Menu 6 Day Night threshold Safety Recommendations e aaa In this menu you can set the open circuit voltage of PV panel that the CXN Batteries store a large amount of energy Never short circuit a battery Fal MORRING S HRs vet 2 under all circumstances We recommend connecting a fuse slow acting ca controller should know tt s day of night type according to the nominal regulator current directly to the batter Re Nightlight functio The default day night threshold is 4 9V for 12V PV system 9 8V for 24V PV piss eres s y y He SRRING S SRs system Batteries can produce flammable gases Avoid making sparks using fire or Nightlight function MORNING Menu 7 Buzzer on off any naked flame Make sure that the battery room is ventilated a MOCAN mide ere You can turn ON turn OFF the buzzer in this menu Avoid touching or short circuiting wires or terminals Be aware that the Fora Nightlight function MORNING Menu 8 Settings of Excess Energy Management and datalogger voltages on specific terminals or wires can be up to double the battery se FROM 3 HRS after mid of night Ti CXI or CXM the functi f CXN interf hould b vse voltage Use isolated tools stand on
16. tive and negative wire close to each other to minimize lelectromagnetic effects IREMARK Solar panels provide voltage as soon as exposed to sun light Mind the solar panel manufacturer s recommendations in any case To avoid voltage at the load terminal push the button to shut off the load output Connect the wires leading to the loads with correct polarity Mind the recommended wire size CXN10 min 2 5 mm CXN20 min 4 mm CXN40 min 10 mm Fasten the strain relieves If you intend to use the Excess Energy Man agement output follow these steps a Mount the excess energy signal wires as shown in the picture beside b Connect the signal wires to the excess energy management input of the appropri ate load e g Phocos DCL DC voltage converter Reconnect the 4 pin terminal to the left socket of your CXN Set the interface function to Serial _ Interface EXCESS ENERGY amp CURRENT DATA in Programming Menu 8 Close the terminal lid Now you have successfully connected your CXN controller Grounding the Solar System Be aware that the CXN is negative grounding and the negative terminals of the CXN controller are connected internally and therefore have the same electrical potential If any grounding is required always do this on the negative wires Self Test As soon as the controller is supplied with power either from the battery or the solar ar
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