User Manual - MLT Inverters
Contents
1. Any Fault _ Flags set Is there a fault No Continue with Tasks OASIS USER MANUAL PAGE 45 12 2 Battery Critical Flow Chart Battery Critical Flow Chart P Once per second Battery Low Yes Disallow battery cycling Battery low counter exceeded Yes Shut Down PAGE 46 Set battery low relay Flag Start low battery counter OASIS USER MANUAL 12 3 Battery Level How Chart Battery Float Flow Chart 20 times per second Source in spec No Yes Stay disconnected from source Cycling allowed No Connect to source Bulk Charge batteries Stop charging No DIP Float enabled Stop source and start battery cycling Yes Supply load from source power Float batteries OASIS USER MANUAL PAGE 47 12 4 Battery Cycling Flow Chart Battery Cycling Flow Chart Once per second Is cycling enabled No Yes Is it time to cycle Disable Cycling Yes Am allowed to No Yes Enable Cycling PAGE 48 OASIS USER MANUAL 12 5 Overload Overloads Flow Chart 10 times per second No Is there an overload Yes Disallow battery cycling Set relay flag Start overload counter No Overload counter aaa adi Yes Shut Down OASIS USER MANUAL PAGE 49 12 6 Relays PAGE 50 Relay Flow Chart Once per second2. Battery bank voltage A description of the error Note that the serial number is available on the serial plate that is attached to the bottom of the machine inside the cover 1 2 2 Contact Details Telephone 27 0 21 201 1335 Email infoOmltinverters com Address 103 Garfield Road Kenilworth 7708 Cape Town South Africa 1 2 3 Telephone You can reach technical support by telephone directly Monday to Friday between 08h00 and 17h00 GMT 2 hours Queries outside of these hours should be directed to support O mltinverters com and will be answered at the earliest opportunity When contacting technical support please ensure that you have the information listed above available PAGE 8 OASIS USER MANUAL 1 3 System Specifications 1 3 1 System Ratings Rated Voltage Frequency Rated Output Power Rated Output Current Maximum output current THD V at rated power Protection Changeover time 13 2 AC Input Input Voltage Range Input Frequency Range Rated Input Current 1 3 3 Battery Voltage Nominal Charging Voltage Maximum Charging Current Battery Technology Oasis 324 19 230 V 50 Hz 3 kVA 13 A 40 A with AC source 19 A for 30s 26 A for 2s 40 A with AC source lt 5 Oasis 436 448 19 230 V 50 Hz 4 kVA 17 A 40 A with AC source 26 A for 30s 34 A for 2s 40 A with AC source lt 5 Oasis 636 648 19 230 V 50 Hz 6 KVA 26 A 60 A with AC sourc
3. Am allowed to Ba Disconnect Relay No close the relay Yes Are there an No relay flags Yes Engage Relay OASIS USER MANUAL 12 7 Waming Condition Warning condition flow chart Once per second Warning condition Clear flag Yes Set flag Create event log Display warning Set check flag message Clear Turn off buzzer Clear warning message Warning beep enabled Do nothing Turn on buzzer OASIS USER MANUAL PAGE 51 12 8 Fault Condition Fault condition flow chart Once per second Fault condition No Do nothing Yes Turn off buzzer Remove fault popup Clear flag Create event log Display fault popup Reset pressed Yes No Do nothing Fault beep bled Ye Turn on buzzer Pnadled No Do nothing PAGE 52 OASIS USER MANUAL V7 T7 SP Lab F ne
4. De rating the Oasis inverter output power at high altitude ceeace 11 Figure 2 Identifying parts of the Oasis 13 Figure 3 Wall MOUNTNE nearr iienaa D ati aa er ta a 17 Figure 4 AC Input output Connections on the Oasis 19 FIBA 5 ADC CAI SS RS c oda ca a et aia ala atoli la Ed dec 20 Fieiire 6 Oasis DC COMMECHOMS casei osia art aa tre adi a aaa te at 21 PAGE 6 OASIS USER MANUAL 1 Introduction 1 1 Wamingsand Cautions A safety instruction message includes a hazard alert symbol and a signal word WARNING or CAUTION Each signal word has the following meaning HIGH VOLTAGE This symbol indicates the presence of a high voltage It calls your attention to items or operations that could be dangerous to yourself or others operating this equipment Read the message and follow the instructions carefully WARNING Indicates a potentially hazardous situation which if not avoided can result in serious injury or death CAUTION Indicates a potentially hazardous situation which if not avoided can result in minor to moderate injury or serious damage to the product The situation described in the CAUTION may if not avoided lead to serious results gt PP GENERAL WARNINGS DANGER OF ELECTRIC SHOCK There are no user serviceable parts inside the inverter DO NOT attempt to make repairs or alterations to the unit WARNING This equipment should be installed adjusted and serviced by qualified electrical
5. check the wiring between the generator and the Oasis for a fault The allowable input voltage range can be found in the specifications 10 22 Why doesthe generatorconnect and then immediately drop out This could be caused by overloading of the generator Check that the generators rated capacity is large enough to supply the load that is connected to the Oasis Turn off some loads if necessary If the generator is very small and drops out soon after the Oasis begins charging the Oasis will reduce the charging current before re starting the charging cycle If this has happened due to a large load on the output of the Oasis the charging current may be very low pressing the reset button on the front of the Oasis will restore the charging current to that set by the jumper Refer to 8 8 1 Battery charging current on Page 39 10 23 Why didn t get the usualcapacity fom my storage battenes Were the batteries fully charged to start with To ensure a consistent performance from the batteries it is important that they are charged correctly Each battery type flooded deep cycle sealed gel etc has different charging requirements Incorrect adjustment of battery settings is the most common cause of reduced backup time from your batteries For Flooded Lead Acid Batteries it is important to check the battery electrolyte level periodically Never leave the battery cells with the electrolyte below the required level One or more of the batteries in
6. Ah Ah Haye tre T a charge current A So for example with a battery bank of 205Ah for a sealed battery 205 Ah 20 5A 10h me This is the absolute maximum current that the sealed battery bank should be charged with Always configure battery charging currents according to manufacturer limits 8 9 2 Battery charging voltages The Oasis has two battery charging voltages that can be set Charging voltages are either 2 35 VPC bulk charge with a 2 20 VPC float voltage or a 2 35 VPC bulk with a 2 20 VPC float voltage Converting VPC to battery bank voltage is as simple as multiplying the VPC voltage with the number of cells in the battery bank For example for a 48V battery bank which has 24 cells in series 24 cells x 2 35 VPC 56 4 V Generally Standard Gel Sealed or Low Maintenance batteries should be charged at the lower voltage setting and flooded Deep cycle batteries should be charged at the higher voltage setting Always configure battery charging voltages according to manufacturer limits PAGE 40 OASIS USER MANUAL 9 About SolarPanels 91 Introduction The term solar panel refers to a panel comprising a number of Photovoltaic PV cells which convert sunlight into electricity Solar panels are a source of renewable energy which is becoming increasingly accessible As with most renewable systems solar panels are unable to provide energy at all times as there may be insufficient sunlight available T
7. Overload will occur 5 5 4 2 ContinuousOvenoad Inverter has shut down due to a continuous overload 554 3 Short Circuit An overcurrent fault has occurred typically a short circuit 5 5 4 4 Overtemperature The inverter has overheated and shut down Please ensure that the inverter is in a properly ventilated area and if using at high altitude that the inverter load is appropriately derated 5 5 4 5 High Source Voltages The Source voltage is too high to successfully connect to 554 6 AC Connection Eror AC detected on output while inverter is off typically caused by incorrect wiring Alternatively if the error persist a possible internal source relay fault has occurred please contact MLT inverters 5 5 4 7 Battery Critical A low battery condition is occurred if no external source is connected it will shut down shortly with a Battery Empty warning 5 5 4 8 Battery Empty The Oasis inverter has shut down due to a critically low battery condition 5 5 4 9 High Battery Voltage Battery voltage has exceeded maximum safe voltage forcing the inverter to shut down This is typically caused by a faulty in incorrectly configured external battery charger or regulator OASIS USER MANUAL PAGE 27 5 6 Settings 5 6 1 SettingsMenu date amp time Selecting Alarms Date amp Time Relay Control and Battery Cycle will take you to their respective setting screen 5 6 2 Setup Alarms setup alarms warnings batt
8. maintenance personnel familiar with the construction and operation of the equipment and the hazards involved Failure to observe this precaution could result in personal injury GENERAL CAUTIONS CAUTION Always wear personal protective equipment protective clothing gloves and safety boots while performing an installation or maintenance to avoid the danger of injuries CAUTION Proper grounds disconnecting devices e g bypass boxes and other safety devices and their location are the responsibility of the user and are not provided by MLT Inverters CAUTION Do not cover the device or store it in a small space always keep it well ventilated and well away from flammable gases or powders Components in the device could potentially cause a small electric spark that could ignite flammable gas or powders Flammable gases are created by batteries and can become a hazard in poorly ventilated spaces CAUTION For indoor use only and MUST be installed in a dry area free from conductive liquids or conductive debris If part of the inverter becomes submerged in water look for a safe way to isolate it at the distribution board and if possible at the batteries OASIS USER MANUAL PAGE 7 12 Contacting MLTinverters 12 1 Product Support When contacting Product Support via telephone email or fax please provide the following information for the fastest possible service Type of Inverter Serial number m Battery type Battery bank capacity
9. the battery bank could be faulty Check the batteries in accordance with the manufacturer s documentation and replace as necessary Flooded lead acid batteries can be checked with a hydrometer All batteries should measure the same specific gravity 10 PAGE 42 OASIS USER MANUAL Sealed batteries can be tested with a multi meter All batteries should measure the same voltage 10 24 Why doesn t my Oass wake up when I witch on a load Is the load large enough The load sensing feature of the Auto mode requires a minimum load of 20W to be connected before the Oasis will start A single cell phone charger for example is not large enough Try switching on a light bulb or TV to increase the load or turning off the load sense mode A typical compact fluorescent or Energy saver light bulb uses between 8W and 14W OASIS USER MANUAL PAGE 43 AC DC Generator Grid Utility PV SRC or SOURCE Wind Turbine PAGE 44 Alternating current The utility generators and inverters can supply AC The AC voltage to homes in South Africa is described as 230V AC 50Hz meaning 230V RMS that is alternating between a positive voltage and a negative voltage 50 times a second Direct current Batteries solar panels PV and some wind turbines provide DC The Oasis can take DC from batteries and output 230V AC to supply homes and businesses This is a machine that usually runs off diesel or petrol to provide AC power Generators ar
10. to ensure your safety 6 2 1 Preparation Before starting the installation ensure that you read the owner s handbook for the generator that you are installing and that you are fully aware of requirements such as minimum cable size and generator siting information MLT Inverters recommends using the correct wire size to connect your generator to your Oasis sizes listed below 6 2 2 Installing a Generator 1 Power down the Oasis by completing the instructions in Powering down the Oasis on page 20 2 Ifa generator or utility is connected double check that it is OFF and any Automatic starting circuitry that could cause the generator to start is disabled 3 Referring to Figure 4 bring a minimum size of 10mm for the 3kVA and 4kVA models and 16mm for the 6kVA model cables from the generator into the Generator terminals of the Oasis taking care to connect the Live wire to the L terminal and the Neutral wire to the N terminal While every attempt has been made to insure the safety and reliability of the Oasis there is a chance that connecting the generator incorrectly could cause damage to the unit 4 Make sure to ground the generators chassis to the same Earth connection as the Oasis 5 Once all the internal electrical connections have been made check that they are secure as a loose connection could get hot enough to cause a fire 6 Follow the instructions in Powering up the Oasis on page 19 to r
11. un 14 OASIS USER MANUAL PAGE 3 Ae am Ke FET o Selis eee TT nT ONT ncn ae eer A aul ada 15 2 4 MLT Bridge Communications Optional Add on cccescesesseeseeeseeesseeseeeseeesaeens 15 3 Mounting and Electrical Connections 16 3 1 Installing the Oasis Inverter ainina ENS 16 3 1 1 Selecting a suitable location 16 3 12 MOUNDE oran donnent a a ad all sa tabu 16 3 1 3 Making the electrical connections 17 3 144 Setting WD the OASIS ainsi einen 19 3 15 Powering up the OASIS Ann nintendo nus 19 3 1 6 Powering down the Oasis ini ia al o aaa a d dl d 20 4 inverter Operation INAICATOrS corun ocesecai odata bea cata sia aia poa ala eat 22 AT MANETTES nn NA ne 0 200098 Di nb ll oi 22 4 2 BALLER SL ES Let PP opta p oare Bo ba ete ti is iuti AE aie 22 43 SOUlCE StAtUs ennemie a al ou ia apa d ata a i 22 44 koad STATUS ne du cl ta bl a at 22 AS Special COMBIRatIO Ss cc ae acea iac aaa ia Ur tn AR ai a dalta 22 5 IILE ACE runacuna denis lace oies 23 ST COMOTPBUTON S255 shes SR nn d ao las datata Sl da lada Si 23 5 2 System ICONS ina inner i al ei oul 23 S3 Dashboard siropen nn ete ai oal ao cata da dise 23 547 CONTE PANE loco ca ciinii bd air al act lait Crt Bta 24 55 Graphs and LOGS stein 3 pontoane dal da catia Adana ct Aaaa Da nicolae 25 55 Source GI alis esuata ua a cl e tc lt uta lia aa d a a alt 25 5 52 Eoad GRAS nana dual sc aaa sot 25 Bio Battery GLADIIS sate setul T AN 26 DS A
12. 014 The Dashboard screen shows an overview of the current inverter operation Power drawn from the source battery charging current and load size is shown Clicking on each of the icons takes you to the individual graphing screens From the top left the source power draw and frequency is indicated underneath the red Source icon OASIS USER MANUAL PAGE 23 The blue Inverter icon indicates the mode that the inverter is in The orange Load icon shows the power and the voltage that is being consumed by the load The green Battery icon is subscripted by the current that is charging or draining the battery with a positive value indicating charging and a negative value indicating discharge The bars within the icon are an indication of the state charge of the battery bank with four bars implying a full charge and one bar implying battery critical The directional arrow indicates which direction the power is flowing If the arrow points towards the battery the battery is getting charged If the arrow points away from the battery the battery is being used to power the load The bottom part of the screen contains a bar showing system status and indicates any known issues Next to it is the current date and time 54 Control Panel 09 30 08 08 2014 There are four button here with the followings functions Reset will clear any active error messages and turn the inverter on If the error is still present it will not turn on Load S
13. 1 1 2 Battery Type Selection Adjust the battery type selection to best fit your battery type be it AGM Sealed or Flooded Cell type Typically flooded cell type batteries float and charge at higher voltages than sealed and AGM type of batteries Flooded ON Sealed AGM OFF Battery Float Voltage 2 20 VPC 2 20 VPC Battery Bulk Voltage 2 45 VPC 2 35 VPC 71 13 Float Charge Enable Selection The float charge enable switch enables or disables the fourth charge stage If this is disabled the charger will perform the bulk and absorption charge stages and then stop charging the batteries Charging will only resume if the battery voltage falls below the recharge voltage If the float charge is enabled then the charger will perform the bulk and absorption charge stages as normal and will then maintain the batteries at the float voltage indefinitely The float charge is desirable when the inverter is used as a backup supply and it is critical that the batteries always be fully charged and ready This does however use power from the AC source to keep the batteries at the float voltage 7 1 1 4 Audible Beep Cautions If enabled this allows the user to enable an audible beeping sound when a Caution event occurs This can be enabled or disabled via the HMI interface If this is enabled but the option on the HMI is disabled this will be disabled 7 1 1 5 Audible Beep Wamings If enabled this allows the user to enable an audible beeping sound whe
14. EVEN OSS A see atenta Rae ina lan 26 5 07 SEINES ann caii dA 0 N ta a a a at lt 28 5 01 SCLIN ES M nard 28 5 52 Setup Ale MS sist s cuie ae adusa abona Dead dai 28 PAGE 4 OASIS USER MANUAL Bs Sa Dat amp TINE En aia canta ab taittaa 1 ten tatei ea 29 SOA REIC ONTO RR E PIONEER RO PE ETET 30 5 65 Batterv VClEn ras Re ia s da asi i ati da a aliat cd ba 31 6 CONEA Essia de talc 4 ua aa ea bac Ea ad calus oana tao ad cala 33 6 1 DIPSWIEChCONNIBd ATOM san nine lies bt le 33 6 2 Connecting an external AC source nn 33 62r Preparation LE cota luata aaa ar al Dl a i ae wes al d tete 33 6 2 2 Installine a Generator nas diminue 33 7 CO EU ratIe II SWILCIES nn nn ane no tot ne ct 34 Tk DIP SWICK TADE sistent nain din ii la 34 7 1 1 Description of DIP functionality sn 34 GO ADOUT BIENES serum entends iii ten amants 36 S1 O R MISE SSSR a eu 36 8 11 Sealed Batteries een demand 36 8 1 2 Deep Cycle Batteries sise E aoe 36 8 2 Battery Bank LOCATION ten sin M tend dap Zita dioda tits 36 0 23 Mamta NCE seer E E nt Ai ua 37 8 1 Replacing a Battery anaa aA 37 8 5 Batey BINK SZE iaria a N EAA AA aula 37 86 Battery CHANCIN eose raie at insiste 38 8 6 1 Battery Charging Stages nain nine i ball ie 38 Sr Biter LOW LeVElS cancion aie ataca Ananas Au 39 S8 Battery Cells Voltage sis ei e aaa ll e ol ain lu a da ul d a 39 89 Battery charger settings seccceadconzsusvseziudscaetatisadnons ALND 39 8 9 1 Battery chargin
15. at secure the removable bottom cover The Load connections inside the Oasis will need to be connected into your distribution board to provide power to your house These connections should be made with a minimum size of 10mm for the 3kVA and 4kVA models and 16mm for the 6kVA models Take care to connect the Live wire to the L terminal and the Neutral wire to the N terminal If you are installing a generator make sure it is switched off and any Automatic starting circuitry is disabled before continuing Referring to Figure 4 bring 10mm for the 3kVA and 4kVA models and 16mm for the 6kVA model sized cables into the Generator terminals of the Oasis taking care to connect the Live wire to the L terminal and the OASIS USER MANUAL PAGE 17 Neutral wire to the N terminal Connecting the generator incorrectly could cause damage to the unit If the Oasis is being used without a generator the Generator Neutral terminal inside the unit must be connected to the Earth so that external earth leakage protection devices can operate correctly In installations with a generator the generator chassis must be grounded to the same earth as the Oasis The Earth terminal inside the Oasis must be grounded to reduce the risk of electrical shock and to ensure that external earth leakage protection device can operate correctly The Oasis comes from the factory with battery leads included Tighten the cables to t
16. batteries or battery banks 3 Place the new battery in position and connect and tighten positive and negative connections red positive black negative 4 Repeat steps 2 and 3 for any other batteries that need replacing 5 Replace Battery Fuse and if applicable Solar Array Fuse 6 Follow the instructions for Powering up the Oasis on page 19 8 5 Battery Bank Sze MLT Inverters recommends a battery bank of at least the following sizes Oasis Model 324 436 448 636 648 Minimum Battery Bank 100Ah 150Ah 200Ah OASIS USER MANUAL PAGE 37 8 6 Battery charging 8 6 1 Battery Charging Sages Typical Battery Charge Curves 2 60 2 50 2 40 2 30 2 20 2 10 2 00 1 90 Battery Voltage Volts per Cell 1 80 2 1 O0 1 2 3 4 5 6 7 8 9 10 11 12 13 Time hours em Flooded Battery Sealed Battery eee Partial Recharge gt Equalise Charge The Oasis includes a four stage battery charger Please configure the inverter for use with your batteries as per your battery manufacturers specifications Above is a typical battery charge curve for a lead acid battery It consists of four stages a bulk constant current stage absorption stage taper to float stage and last the float stage The total charging period is approximately 10 hours in this example but can be much shorter depending on depth of discharge charging current and inverter load 8 6 1 1 Stage 1 Bulk Constant Curent Charge Period Hours 0 8 Th
17. cable is connected Not following this step will not cause damage to the damage inverter but may cause pitting on the terminal leads 4 Leaving the Pre charge cable on the Positive terminal of the battery connect the Positive cable onto the Positive terminal on the battery as well See Figure 6 5 Make sure the battery connections are secure OASIS USER MANUAL PAGE 19 3 16 Powerng down the Oass If it is necessary to turn off or disconnect your Oasis for some reason follow these simple steps 1 Turnofftheinverter 2 Ifa source such as a generator or utility is connected make sure it is turned off and that the breakers to the source are disconnected 3 If required the Oasis can now be disconnected from the batteries 4 Once disconnected from the batteries connect the Pre charge cable to the Negative cable as this will discharge the DC capacitors inside the Oasis Negative Positive Pre charge Cable Cable Cable Figure 5 DC cables PAGE 20 OASIS USER MANUAL Positive Cable with Precharge Negative Cable Figure 6 Oasis DC connections OASIS USER MANUAL PAGE 21 4 InverterO peration Indicators On the front panel of the Oasis inverter are four LED status indicators BO Inverter status Battery status Source status Load status 4 1 Inverter Satus This LED indicator is off when the inverter is turned off and green when the inverter is operating normally 4 2 Battery Status Th
18. e 39 A for 30s 52 A for 2s 60 A with AC source lt 5 Surge Overload Short circuit Over temperature Reverse power Low High battery voltage Less than 30ms changeover time after source failure Some devices might lose power with changeover 185 250 V 42 65 Hz 40 A DC Specifications 24 V 28 2 29 4 V 25 50 A 185 250 V 42 65 Hz 40 A 36 48V 185 250 V 42 65 Hz 60 A 36 48 V 42 3 44 1 V 36 V and 56 4 58 8 V 48 V 25 50A 36 V amp 20 40 A 48 V Lead Acid Li lon 1 Contact MLT Inverters for details on supported Batteries OASIS USER MANUAL 30 60 A 36 V amp 25 50 48 V PAGE 9 Connectors Rated Voltage Frequency 19 230 V 50 Hz Rated Output Power 3 kVA 13 4 Efficiency Oasis 324 Efficiency Up to 94 No Load Power Consumption On lt 30 W No Load Power Consumption Load 5 W Sense 135 GeneralSpecffications Mounting Method Dimensions W x H x D IP NEMA Rating Colour Weight Architecture 355 x 580 x 210 mm IP20 NEMA1 RAL9002 RAL9011 40 kg 19 230 V 50 Hz 4 KVA 19 230 V 50 Hz 6 KVA Oasis 436 448 Oasis 636 648 Up to 94 lt 35W 6 W Wall Mounted 355 x 580 x 210 mm IP20 NEMA1 RAL9002 RAL9011 40 kg Up to 94 lt 40 W 6 W 380 x 700 x 210 mm IP20 NEMA1 RAL9002 RAL9011 60 kg Galvanically Isolated Forced Air Cooling 1 3 6 Climatic Condit
19. e battery status LED is green when the battery voltage is within the expectable voltage levels orange when the battery is low and red when the battery voltage is critically low or high When the inverter is charging the LED s will flash with the same red for critically low orange for low and green for good colour scheme used 4 3 Source Status If the source is unavailable it is off green when the source is available and within specifications and lastly red when the source is not within acceptable limits 44 Load Status This turn green when the load is acceptable The following red LED states can exists e _ Solid red implies a short circuit error e Aslow red flash when the inverter is overloaded e When a continuous overload state exists the LED will flash in a fast manner 45 SpecialCombinations When an AC connection error occurs the source and load LED will both be red With an overtemperature fault both the source and load LED will flash red PAGE 22 OASIS USER MANUAL 5 Interface The Oasis HMI Human Machine Interface is a full colour 4 5 touchscreen interface This chapter covers using the interface to set up the Oasis 5 1 On Off Button This push button turns the inverter on and off 5 2 System Icons There are four system icons on the right hand column Pushing on the icon select the current screen al Dashboard Control Panel Graphing Settings 5 3 Dashboard 09 30 08 08 2
20. e start your machine OASIS USER MANUAL PAGE 33 7 Configuration Switches on ON OFF LANCE y 1 933945 GET 58 50 HO 49 DIP Switches are manual electric switches that are packaged by group into a standard dual in line package DIP This allows the user to manually select certain operations and toggle inverter functionality The DIP Switches are located underneath the removable terminal cover The switches can be turned on or off by moving the pin up towards the ON position for on or moving it to the OFF position away from the on text The default position of all the switches are shown above and table below 7 1 DIP Switch Table Switch Function Default ON OFF 1 Battery capacity selection OFF 400 Ah or more Less than 400 Ah 2 Battery type selection OFF Flooded Sealed 3 Float charge enable ON Enabled Disabled 4 Audible Beep Cautions ON HMI configurable Disabled 5 Audible Beep Warnings ON HMI configurable Disabled 6 Large source OFF Enabled Disabled 7 Battery cycle mode enable OFF HMI configurable Disabled 8 Load sense mode enable OFF HMI configurable Disabled 9to12 Reserved 7 1 1 Descnption of DIP functionality 7 1 1 1 Battery capacity Selection Adjust the battery capacity selection switch to alter the battery charging current Model ON OFF Oasis 324 50A 25A Oasis 436 50A 25A Oasis 448 40 A 20 A Oasis 636 60 A 30 A Oasis 648 50 A 25 A PAGE 34 OASIS USER MANUAL 7
21. e usually only run when needed Generators need to be run periodically to keep their moving parts functional Generators usually provide most power per litre when they are electrically loaded to 80 of their rating This is an AC power source that is usually will be present most of the time The utility is often provided by some power producing company and is not always reliable due to lack of capacity Photo voltaic cell Also known as solar panels PV cells generate DC electricity when sunlight strikes them A source abbreviated as SRC is the general definition for an AC supply such as the Grid or a Generator This is a modern form of wind mill Wind turbines generate electricity when their blades are rotated by the wind Wind turbines usually generate DC OASIS USER MANUAL 12 Appendix Operational Flow Charts The following section outlines the software logic flow charts for the Oasis operation It can be used as a guide to any situation where you are unsure of the logical outcome of what decisions the Oasis will make The Oasis logic is based on a flag system Every second or faster for some more important tasks flags are checked and set Decisions and actions are then made or prevented based on which flags have been set The diagram below illustrates how this process is carried out 12 1 Flag Based Logic How Chart Example of Flag Based Logic Flow Chart No Clear Flag Yes Yes Set Fault flag Start Fault Process
22. ense toggles between turning on and off the load sensing option When the icon is darker it is considered on Battery Cycle icon toggles between turning on and off the battery cycle option The battery cycle option can be set up on the settings menu See section 2 On will turn on the inverter When on the icon will change to Off which will turn off the inverter PAGE 24 OASIS USER MANUAL 55 Graphing and Logs 5 5 1 Source Graphs 200 rated power t The source graph screen graphically shows the power The grid power or source power can be as high as 200 of the inverters rated input 5 5 2 Load Graphs 150 B ka T gt o a D a g t OASIS USER MANUAL PAGE 25 The load graph screen graphically shows the total power consumed by the load notice that the grid power or source power can be as high as 150 of the inverters rated output 5 5 3 Battery Graphs battery status The battery graph screen graphically illustrates the depletion or replenishing of the battery bank The green orange and red bar on the left is a rough indication of charge left 5 5 4 Eventlogs event logs PAGE 26 OASIS USER MANUAL Event logs are viewable on this interface screen It is sorted in a descending list by time and date The following events are logged 5 5 4 1 Overoad The inverter has experienced an instantaneous overload higher than the rated capacity of the inverter If this persists a Continuous
23. ery critical overload PAGE 28 OASIS USER MANUAL Click on the beep square to toggle on and off Beep implies that the inverter will sound an audible noise at a once per second interval Warnings include the following conditions Description of the warning available above in section 5 5 4 Event logs e Continuous overload e Over temperature e Short Circuit e AC connection error e Battery empty e Battery voltage too high 5 6 3 Date amp Time date amp time This allows you to set the date and time using the up and down arrows In this example the date is the 215t of November 2014 with the time being 12h45 in the afternoon Green and blue is for setting the date in the day month year format and the orange buttons are for setting the time in the 24 hour time format Use up and down arrows to change the time date and the save button to make the changes permanent OASIS USER MANUAL PAGE 29 5 6 4 Relay Control relay control activate relay battery critical high load overload A single no voltage auxiliary relay can be controlled with the above three user settings Please see section 2 for more details on how to use this relay settings 5 6 4 1 Battery Critical When a battery critical flag is set the auxiliary relay will be engaged 5 6 4 2 High Load When a high load flag is set the auxiliary relay will be engaged 5 6 4 3 Overoad When an overload flag is set the auxiliary relay will be e
24. external chargers connected you could select the partial recharge function to allow just a partial AC recharge This will enable the batteries to make use of the external sources OASIS USER MANUAL PAGE 31 5 6 5 3 Equalise An equalise charge is nothing more than a forced overcharge of a battery This helps if a battery is suffering from sulfation and stratification Sulfation is the gradual build up of amorphous lead sulfate into stable crystalline structures that deposit on the negative plates during extended periods of discharge Stratification is the separation of acid and water within the electrolyte Only if the flooded DIP switch is enabled DIP switch one the user can enable the once off equalise charge This is performed at 2 55VPC and once this voltage is reached the inverter will keep it at equalise voltage for one hour After one hour check the specific gravity of your batteries If required equalise charges can be performed again When the battery is being equalised the battery icon changes to the symbol on the right Typically you would perform an equalisation charge if individual battery specific gravity levels differ significantly This should only be performed if your battery manufacturer recommends equalisation PAGE 32 OASIS USER MANUAL 6 Configuration 6 1 DIP Switch configuration 6 2 Connecting an extemal AC source Follow these steps when connecting an external AC source such as a generator or utility
25. g current i cosazeseuestaeaoocaaoe sei it Diode ia gasl d 39 8 9 2 Battery Charging voltages eee eee ss 40 9 ADONUSOlar Panel sn scai inot azata vasele udata iat N da cec ala 41 OL MAFOGUCUG Mises erctpocusscsacesens RR IRA OR N TA NR PRR ART NR OR TA 41 9 2 Using a Solar System with the Oasis 41 OASIS USER MANUAL PAGE 5 10 OUI ESIMOO CMSs Sienna dns id Nea tie at iat et dal 42 101 Fal E ERE e RR e ED 42 10 2 Typical Problems ie audi a a aa 42 10 2 1 Why does the Oasis not connect to a running generator 068 42 10 2 2 Why does the generator connect and then immediately drop out 42 10 2 3 Why didn t get the usual capacity from my storage batteries 42 10 2 4 Why doesn t my Oasis wake up when switch on a load 43 Ti o i aV anse E RR PRR RODIE RN NS RIP PRI 9 API PI POTZI ARI IPN RI PRR ont 44 12 Appendix Operational Flow Charts ss 45 12 1 Flag Based Logic Flow Chant sei sasi ecou nula dei aa a d a Dale oa dala di 45 12 2 Battery Critical Flow Chart i aa da balon aa taur aa 46 12 3 Battery Level FOW CHIT is iasa atacau speta ot eee a ua te 47 12 4 Battery Cycling Flow Chart eee eee eee eee eee eee nea enaa eee 48 TAS OVE OAC es es dilata al nono ent nd capia id 49 12 02 REII oase RS MET RE SO lo nalba ta dalta a a aut 50 1227 Warnie Condition scie ostean Ne AR tai SR ina a da 51 12 8 Faut CONAN Sn Ne nn ennui 52 Figures Figure 1
26. he DC terminal connections taking care to observe the polarity It is not recommended that these be lengthened If however replacing the DC cables is unavoidable make sure to use cables of the same size length and rating 35mm to avoid any problems Once all the electrical connections have been made double check that they are secure as a loose connection could get hot enough to cause a fire Note External protection devices such as fuses circuit breakers and earth leakage protection are the responsibility of the owner and not of MLT Inverters MLT Inverters cannot be held responsible for personal injury death or damage to property or equipment caused by the improper use or installation of this equipment It is therefore recommended that all the electrical connections must be made by a qualified electrician or an MLT Inverters approved installer PAGE 18 OASIS USER MANUAL Figure 4 AC Input output Connections on the Oasis 3 14 Setting up the Oass 3 15 Powenng up the Oass 1 Make sure all source Generator or utility and load AC wires and the DC cables are connected correctly to the Oasis 2 Connect the Negative battery cable to the Negative terminal of the battery 3 Put the pre charge cable onto the Positive terminal on the battery and hold it there for about ten seconds and until the user screen has powered up this will pre charge the DC capacitors inside the Oasis so that there is no spark when the Positive
27. i ower into clean AC power that the load can use The m built in battery charging function allows the use of a backup generator or the grid without the need for i S external battery chargers T The Oasis can be configured to maximise self consumption of renewable power by disconnecting from the grid during specified times enabling optimal use of all available renewable power 1 4 2 TypicalGrd tied Application The Oasis inverter will act as a backup supply to provide 33 power from the batteries in the event of a grid failure Installing a solar PV inverter on the load side will allow gt C O PN ww efficient use of solar energy and any excess generated power will automatically be used to charge the batteries or be exported to the grid 14 3 Basc GeneratororLoad Control In off grid systems the Oasis inverter can automatically start the generator when the battery voltage is low or an overload occurs 1 TI The Oasis synchronises with the generator before connecting the load When the charge cycle is complete or when the overload disappears the Oasis will turn off the generator and transition back to stand alone mode The Oasis can also be used to turn on off specific loads based on low battery voltage or overload PAGE 12 OASIS USER MANUAL Touchscreen HMI Human Machine Interface On Off Button Inverter Operating Indication LEDs 9 Wye ATERS AC Terminal Bloc
28. imal performance please refer to the following instructions regarding the installation and setup of your newly purchased Oasis 3 11 Selecting a suitable location When selecting a location to mount your Oasis inverter take note of the following 1 The Oasis should be mounted indoors in a well ventilated area out of direct sunlight where the ambient temperature does not exceed 45 C inverter derating applies 2 The Oasis is designed to be wall mounted and must therefore be installed upright in a vertical position with a clearance of 200mm above and below to allow sufficient cooling and airflow The wall must be able to take the full weight otherwise use a mounting frame 3 The battery leads should be as short as possible so that the Oasis inverter will need to be in close proximity to the batteries Standard cables are supplied with the inverter 4 While charging the batteries the Oasis inverter will emit an audible hum This should be taken into account when selecting a suitable location Note At high altitudes natural thermal convection natural thermal cooling of the all electrical equipment is degraded This is due a lower air density available to remove heat from the heatsink In accordance with the standards the Oasis is rated for altitudes up to 1000m above sea level If it is going to be installed in an area where the altitude is greater than 1000m above sea level refer to the power derating graph Figure 1 to establ
29. ions Ambient Temperature Ambient Transport Temperature Maximum Ambient for Rated Power Relative Humidity Non Condensing Maximum Altitude for Rated Power 13 7 OperatorPanel Display Type PAGE 10 5 45 C 25 70 C 40 C 5 85 1000 m above sea level Power derated for High Altitude Full Colour Touch Screen 4 3 LCD 24h logs of source power load power battery state of charge and Events OASIS USER MANUAL 13 8 Altitude Derating Percentage of rated power vs Altitude 100 98 96 94 92 90 88 86 84 82 80 0 500 1000 1500 2000 2500 3000 3500 4000 Altititude Above Sea Level in Meters Percentage of Rated Power Figure 1 De rating the Oasis inverter output power at high altitude OASIS USER MANUAL PAGE 11 14 System Description The Oasis inverter range offers a cost effective and reliable solution to the home or farm owner faced with unreliable or no grid electricity supply The inverter operates at low voltage DC and is transformer based which translates to a robust and safe product that guarantees trusted power in the harshest environments The Oasis inverter system can be configured in various ways and some examples are shown below 14 1 Typical Off gnd orSelf Consumption Application The Oasis inverter is ideal for off grid installations where the renewable source of power is fed directly C into the batteries The Oasis converts the battery Le
30. is is the first stage of charge using a constant current until the either the bulk voltage is reached At the end of this stage the battery is around 80 full This charge period will typically last 7 10 hours 8 6 1 2 Stage 2 Absorption Charge Period Hours 8 10 This stage maintains the cells and hence the batteries at a constant voltage This will complete the battery charge This charge period is 2 hours or until the charge current is reduced to zero amps This is sometimes referred to as a boost or bulk charge PAGE 38 OASIS USER MANUAL 8 6 1 3 Stage 3 Taperto Float Pernod End of Bulk The voltage per cell will be lowered to the float voltage per cell by lowering the current into the battery cells and letting the battery discharge into the load or self discharging This typically should only last a few minutes 8 6 1 4 Stage 4 Float Taper Charge Period Hours 10 The current into the battery cells is reduced at a rate that allows the voltage on the cells to remain constant at the float voltage level If an auto start generator was used it will turn off when this stage is reached This float stage can be disabled via the DIP switches 8 7 Battery Low Levels The Oasis has a low voltage cut off of 1 80 VPC After the inverter has switched off due to a low voltage it will only resume AC output when on batteries if 2 00 VPC is achieved If source connected either to the grid or a generator it will pass on the AC output whi
31. ish the maximum continuous load 3 12 Mounting The Oasis is designed to be wall mounted Once a suitable location has been chosen use the following information as a guide to make the mounting process easier 1 Using a 10mm masonry drill bit drill 3 holes 55mm deep and 124mm apart It is recommended to use the bracket as a template 2 Insert the M8 wall anchor bolts through the bracket into the holes and tighten with a 13mm spanner fixing the bracket to the wall 3 Using at least two people hold the Oasis vertically and lift it onto the mounting bracket damage to the machine It is therefore recommended that this step be performed by A Caution The Oasis is quite heavy dropping it could result in personal injury and a minimum of two people or using a mechanical block and tackle PAGE 16 OASIS USER MANUAL 3 1 3 Figure 3 Wall mounting Making the electrical connections Once your Oasis has been mounted on the wall you can begin making the electrical connections Follow these steps to make the task as simple as possible A Caution Failure to follow these instructions carefully could increase the risk of personal injury death or damage to property or equipment Ensure that any electrical connections is dead before touching any potential live wiring Certain electrical connections must be performed by a qualified electrician If in doubt about anything contact MLT Inverters for assistance Remove the screws th
32. ks Fan Air Inlet arg NS DC Terminal Connections MLT Bridge Communication Connection Configuration Switches Heatsink Fins Figure 2 Identifying parts of the Oasis OASIS USER MANUAL PAGE 13 2 Advanced Features 2 1 Battery Cycling The Oasis can be configured to maximise self consumption of renewable power by disconnecting from the grid or source during specified user determined times enabling optimal use of all available renewable power In some cases where peak demand prices are increased the Oasis can thus be programmed to utilise battery power through these periods 2 2 Auxiliary Relay control A single no voltage auxiliary relay can be controlled with three user settings This relay can be used to control external load relays a generator or any other simple binary logical circuit you can think of relay control 2 2 1 Battery Critical If the battery bank is being depleted with no external recharging eventually a battery low state will occur If this continues for long enough a Battery Critical state is reached When a Battery Critical stage is reached the auxiliary relay will be engaged This allows for example a generator to be connected and automatically start 222 High Load If the inverter s capacity is approaching close to the maximum rated capacity the auxiliary relay will be engaged This allows for example a contactor to be connected and automatically engage to connect the
33. le charging If battery cycle mode is enabled the inverter will reconnect to the source once 1 96 VPC is reached 8 8 Battery Cells Voltage Due the electrochemical reaction of the battery each cell or pair of plates has a nominal voltage of around 2 Volts Therefore charging voltages for lead acid batteries are typically rated on a volt per cell VPC rate A typical car battery is made from 6 pairs of plates giving a total voltage of 6 cells x2 V 12 Y Renewable battery banks are typically 48V and is composed of 24 cells x 2V 48 V 8 9 Battery chargersettings It is important to select the correct charging current and voltage for your batteries during the installation of your Oasis also if you increase or decrease your battery capacity or replace the battery bank with a different type of battery it may be necessary to change the battery charger settings 8 9 1 Battery charging curent The maximum battery charging current can be set by the changing the appropriate DIP setting see 6 1 DIP Switch configuration on the bottom of the Oasis Note that the actual charging current will depend on the battery voltage and the load OASIS USER MANUAL PAGE 39 As a general rule of thumb a flooded cell type battery bank should be charged over a maximum period of 7 hours and a sealed cell bank should be charged over a 10 hour period This means that the charge current can easily be calculated by using this formula battery capacity
34. mt INVERTERS 2015 MLT Inverters 2nd Edition June 2015 PAGE 2 OASIS USER MANUAL Oasis Series User Manual Table of Contents 1 2 aid ge ro 5 sul o a San ARIPA Eee DSP te IRENE CI ICR RED AIE IRT 7 ade ANarnines and Cautions RNA as re aos 7 12 CONTACTING MILT INVErterS sinear a 8 TZT Produet SUD DOU crests eens eee eee eee ees 8 122 Contact Detal es Si anodin 8 12 93 JelephOne sa oaia ata ot aus aa altadata A Lai aa s i aia An 8 1 53 System Specifications nn A nn st ciao 9 LL yster RANES Rs RS ba naiba aa ai ie 9 d 322 AC FIU sence ate pata ide ati ata il aa aa olt i 9 143 3 DE Specificatii OS css ieste last ta dal a 0 die 9 CONNECIOrS RS RE Satu atata tn si en Bata ae pata 10 AS En GLEN EE N 10 1 3 5 General SpecilicatiOris nsetat dna doinita Sa pat a oaia Dle dota dada Saba dai 10 9 0 Clittiatle CONdItiONS sa saci les ae ata Ne ne 10 153 7 Operator Pane beaan eue 10 1 58 Altitude DEFALING da ea dotata atata id aul atata ta 11 1TA System DESCrIDULOIA scazuta imdb a 12 1 4 1 Typical Off grid or Self Consumption Application 12 1 4 2 Typical Grid tied Application ss 12 1 4 3 Basic Generator or Load Control ss 12 Advanced F ES tiennent 14 Dede Battery COVER eee ta c atata ud ates 14 2 2 AUXIHAN Relay COMO harta 0 aia ea e aa i d aa asa a cael vet aed 14 Ded A Battery CILIA os cas nn a antennes 14 DD 2 SPM Elo Lo NEDREPTATE a 14 222 3 V1 6 t 6 ES ne es an ne
35. n a Warning event occurs This can be enabled or disabled via the HMI interface If this is enabled but the option on the HMI is disabled this will be disabled 7 1 1 6 Large Source This DIP switch allows up to 40A to be drawn from the source This implies that a load larger than the inverter current rating can be connected to the load output if the source is online However if the source is offline and the inverter is running from batteries the load must be reduced to the inverters rated current If the load is higher than inverter rated current and a source failure occurs the inverter will overload causing a loss of power Disable the extra load and reset the inverter to restore power 7 1 1 7 Battery Cycle Mode Enable If this is turned ON then the HMI battery cycling option is enabled ON by default OASIS USER MANUAL PAGE 35 7 1 1 8 Load Sense Mode If this is turned ON then the HMI load sense option is enabled OFF will disable load sensing and the inverter will always be on irrespective of load size 8 About Battenes 8 1 General A number of lead acid batteries are used together to form the battery bank for the Oasis Basically there are two types of lead acid battery that can be used as follows 8 1 1 Sealed Battenes Standard Gel Sealed or Low Maintenance battery which is another name for a normal car battery This type of battery is designed to provide a large current for a very short period of time They a
36. ngaged If all the control settings are selected the relay will perform action for all three states For logical flow charts on inverter operation please see Appendix Operational Flow Charts PAGE 30 OASIS USER MANUAL 5 6 5 Battery Cycle battery cycle start time 23 8 i TB end time m2 Mo AC recharge full E partial equalise once off 5 6 5 1 Start and End Times When the battery cycle is activated in the settings menu the following system operation will be applicable Please ensure that the Date amp Time is set correctly 1 When the Start Time is reached on the clock the inverter will disconnect from the Source If the source is a generator the generator relay will disconnect 2 The system will reconnect to the source when the batteries reach a low state of charge or high load The generator contact will close in order to start the generator 3 Ifthe batteries are fully charged the inverter will again disconnect from the source 4 Ifthe End Time is reached the inverter will remain connected or reconnect to the source 5 6 5 2 AC Recharge Once the inverter is connected to the source it will start with charging the batteries The AC Recharge toggle allows you to switch between a full absorption charge of the batteries or just a partial recharge by aborting the charge once float voltage is obtained If you have no external charging sources e g solar or wind a full recharge is recommended If you have
37. o fill the gaps electricity can be supplied from storage batteries or generators in stand alone systems or from the electrical grid in grid connected systems 92 Using a SolarSystem with the Oass If you are considering adding a solar system to your installation contact your local installer for advice on the type of solar regulator you should use and for details on its installation CAUTION DO NOT connect solar panels directly to the batteries a solar regulator must be used otherwise damage to the batteries and or Oasis could result OASIS USER MANUAL PAGE 41 10 Touble Shooting 10 1 Faults If there is a fault with the Oasis inverter the HMI will indicate which fault has occurred and an audible alarm if enabled via the DIP switches and the HMI control panel will sound If you have a fault that is not addressed in this manual then you should contact the person who installed your Oasis or alternatively MLT Inverters product support See Contacting MLT Inverters on Page 8 10 2 Typical Problems 10 2 1 Why doesthe Oassnotconnectto a running generator Check that any circuit breaker on the generator is in the up position and the Oasis is in either Auto or Manual mode If the generator voltage is very low or high all three LED s on the front of the Oasis will begin flashing simultaneously If this happens check the generator output to ensure that it is operating correctly If the generator is operating normally
38. re not designed to be regularly discharged by more than 25 of their capacity This battery is suitable for backup applications 8 12 Deep Cycle Battenes Deep cycle lead acid batteries are designed to be repeatedly discharged to at least 50 of their capacity which makes them suitable for homes using solar power or off grid power use Thus if in your application you are repeatedly charging and discharging your batteries you should be using deep cycle batteries If however you are using your system as a UPS low maintenance batteries may be sufficient Standard batteries can be flooded batteries which require regular maintenance or sealed which are maintenance free Deep cycle batteries are available only in the flooded variety If standard batteries are suitable maintenance free type should be selected as they do not require topping up of their electrolyte during their life Your Oasis will have either a 36 or 48 volt battery bank while the number of batteries will depend on the capacity required Batteries will be connected in series to give the required 36 or 48 volts Further strings of batteries may be connected in parallel with the first group to increase the capacity of the battery bank 8 2 Battery Bank Location When selecting a suitable location for your battery bank take the following into consideration Batteries MUST be installed in a well ventilated environment away from direct sunlight Ensure that the battery leads are as
39. short as possible for maximum efficiency and avoid extending the battery cables that ship with your Oasis A Battery Fuse MUST ALWAYS be installed and be as close as possible to the batteries ALWAYS observe the electrical wire colour coding convention i e connect the red wire to POSITIVE and the black wire to NEGATIVE PAGE 36 OASIS USER MANUAL 8 3 Maintenance Battery maintenance required will be detailed in the documentation supplied with the battery and for flooded batteries generally includes checking of the electrolyte levels on a regular basis and topping up with distilled water when necessary Providing it is maintained and sited correctly a good quality battery should last for the full number of rated cycles before needing replacement 8 4 Replacing a Battery Always replace a battery with a battery of the same type and capacity Never replace a flooded battery with a maintenance free battery or vice versa If you are not sure about the type and capacity of the batteries installed please contact your installer If the need does arise the following procedure can be followed in order to replace a battery 1 Follow the instructions for Powering down the Oasis on page 20 2 Taking care not to short circuit the battery terminals disconnect and remove the faulty battery ELECTRICAL SHOCK To prevent short circuits it is recommended that you always use an insulated spanner when connecting or disconnecting individual
40. source to the load whenever the load is high saving battery capacity and decreasing operational costs 2 2 3 Overoad When an overload flag is set the auxiliary relay will be engaged This allows for example a contactor to be connected to the grid and automatically engage to connect the source to the load whenever the load is exceeded If all the control settings are selected the relay will perform action for all three states For logical flow charts on inverter operation please see Appendix Operational Flow Charts PAGE 14 OASIS USER MANUAL 2 3 Load Sense The load sensing feature is used to save power on batteries when there is no load at night with all the lights and geyser off The Oasis draws more power when operating converting AC to DC that when in standby no AC output therefore if there is no load to supply the inverter will go into a sleep mode load sense to conserve battery power and check every few seconds if there is load connected to its output If a load has suddenly been connected someone turns on a light then the oasis will power that load 24 MLTBnidge Communications Optional Add on The Bridge external optional add on enables browser based internet monitoring and control of the Oasis inverter The Bridge must be connected to an internet network Visit our website for further details OASIS USER MANUAL PAGE 15 3 Mountng and Electrical Connections 3 1 Installing the Oassinverter For opt
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