User Manual
Contents
1. 2 toggle the or button to get to Connect Voltage position To set the Connect Voltage press both A and button simultaneously again so that the displayed connect voltage flashes Press or button to increase or decrease the connect voltage to your desired voltage level Press both buttons simultaneously until display becomes solid to confirm new setting Continue to do other setting in the same way The product will return to exit from Set Mode 2 automatically after 20 seconds with the new settings 4 4 Set Mode 3 for change of system controls as indicated in the yellow imprints N O N C Normally Open Normally Close INGNITION CONTROL FACTORY DEFAULT N O N C IGNITION FACTORY CONTROL DEFAULT m o m Get to the Set Mode 2 first then press button until Display shows S E E Press both A amp button simultaneously to get to SET MODE 3 Display shows 8866 first then NOJ or Ac Lt Gn a CI as Up button is pressed Return to the Factory Default Example F E g ress both Up amp Down button simultaneously Flashing HE 5 _ 0 toggle by or button to oF 5 Confirm by Press both A amp button simultaneously F g become solid to confirm return to the factory default setting has been done Unit will return to exit from Set Mode 2 automatically after 20 seconds with the new settings N O N C2. Application 0 MODE Normally Open This is the factory default mode The two terminals are normally isolated disconnected open when the unit is powered up The two terminals will be connected when the voltage at the main battery terminal is detected to be at the programmed Connect Voltage level LVR and after the set programmed DELAY TIME C MODE Normally Close This mode is selectable The two terminals are normally connected close when the unit is powered up The two terminals will be disconnected isolated opened when the voltage at the main and after the set programmed DELAY TIME This mode is commonly used for battery protector application The load will be on until the voltage of battery or other dc source drops below the set isolated voltage level Ignition Control application Gn When the ignition control is set to 5 5 the unit only can be operated with car ignition switched ON The factory default setting of Ignition Control is at OFF mode that is the unit is in operation all the time even when car ignition is switched off When the ignition control is set to J k 5 the unit can only be operated with car ignition is switched on and when the car is switched off the unit is also off See wiring diagram in section 6 for connection from Ignition Control Port 3 to the car s electrical point which has current when the car is switched on Remark ov
3. Press both and button simultaneously until display shows 888 then the factory default Connect Voltage You can review the last set values of Connect Isolate Alert Voltages Delay Times and etc by toggle the forward or back buttons and take note the pair of lit up LEDs Connect Voltage Default 13 7V for 12V system Connect Delay Time Default 5sec VOLT E C SEC OL VOTCA E SEC OL_5O CONNECT ISOLATE ALERT CONNECT ISOLATE ALERT a Ca SET N 0 Nc IGNITION FACTORY MODE ci SET N O N C IGNITION FACTORY MODE CONTROL DEFAULT ONTROL DEFAULT Isolate Voltage Default 12 8V for 12V system Isolate Delay Time Default 5sec VOLT E C SEC OL ic5 CONNECT ISOLATE ALERT SET N O N C IGNITION FACTORY MODE CONTROL DEFAULT VOTCA E SEC Ol__5 CONNECT ISOLATE ALERT SET N O N C IGNITION FACTORY MODE CONTROL DEFAULT Alert Voltage Default 12 0V for 12V system Alert Delay Time Default 10sec VOLT MM C SEC OLicd CONNECT ISOLATE ALERT VOLTC Ml SEC Oli CONNECT ISOLATE ALERT co co SET N O N C IGNITION FACTORY SET N O N C IGNITION FACTORY MODE CONTROL DEFAULT MODE CONTROL DEFAULT 4 3 Set Menu Mode 2 Setting the Connect Voltage Isolate Voltage Alert Voltage Delay Time The procedure is same for setting and adjusting all the above parameters Example Setting Connect Voltage During the Review stage as in 4
4. C system LED Indicator Car s Ignition Switch Ground Remote over ride switch Auxiliary Load 12V Alternator pt Ground Ground d 12V Main Battery 12V House Battery vea Esec OL_ CONNECT ISOLATE ALERT ao ao cs R9 SET A xo nc enmon factory MODE CONTROL DEFAULT Ground 8 Installation for a One Battery System Example for 12VDC system LED Indicator Car s Ignition Switch Ground Remote over ride switch Ground DC load for example Fridge vor asec L_ CONNECT ISOLATE ALE Ground SET A xosnc enmon FACTORY MODE CONTROL DEFAULT 8 1 The selected Isolate Voltage is usually lower than the two battery system since the unit here is mainly used as a protection against over discharging the battery 8 2 However the selection of Isolate Voltage and Connect Voltage are very much affected by the type of load and relative battery capacity Select a higher Isolate Voltage for relatively smaller load for high initial draw load such as Motor choose a lower Isolate Voltage 8 3 Itis advisable to use a higher value of Connect Voltage to ensure a more completed charging operation 8 4 Check the battery s specifications for suitable Connect Voltage and Isolate Voltage and in cycling or standby applications 9 MANUAL FOR WIRING AND OPERATION OF THE CONTROL TERMINALS Functions of the 4 Control terminals Neg Negative terminal Connec
5. MB 3688 120A 12V 24V DC PROGRAMMABLE DUAL BATTERY ISOLATOR User Manual Warning and Precautions MB 3688 is built with corrosion resistant material and the main electronic assembly is well sealed inside the die cast alloy This unit is not designed for environments that would allow water to come in contact with the terminals on the housing which result a short circuit The unit can be installed in any position but make sure that there is sufficient ventilated space around the unit to allow dissipation heat at the surface a minimum of 50mm surrounding space is required When use with lead acid battery make sure there is sufficient ventilation for the battery which can emit harmful amp explosive and away from any possible spark or naked fire such as cigarette Cable Sizes and Fuses Cables used at each positive terminal must be of sufficient rating Under sized cables would affect the performance of the unit and shortens the life span Wires connected to control or signal ports DOO carry less than 0 5 Amp Fuses or circuit breakers of appropriate rating must be installed at positive terminal of the house battery and main battery These fuses are for the safety and protection of the vehicle s electrical system in case of a short to the negative ground Warning for using the Remote Over ride to start the vehicle Always check if the house battery bank has sufficiently higher voltage than the main battery to do the job by pressing the b
6. connect and reconnect the battery Over Temperature Unit Over Temperature Check location of unit is well Unit is self recoverable when E p Protection 90 C ventilated internal temperature cool o Check cable size is sufficiently down to below 70 C rated p Low Voltage Main Terminal Check main battery status and Unit is self recoverable when Lu Protection Voltage lt 8V alternator the main battery voltage gt 10V Remark The above voltage setting in the table is only for 12V system the voltage setting is double for 24V system 6 Installation notes 6 1 The unit is factory default as Normal Open MN In case you want to use the unit as Normal Close please go to the set mode and set the unit to Ac 6 2 The Ignition Control feature is factory default as OFF In case you want to control the unit by car ignition switch please go to the set mode and set the Ignition control to 4 6 3 The recommended cable size is AWG 5 with 1M in length and 3 acceptable loss 6 4 Always double check the tightness of all connections by wiggling the connected terminals and etc Connectors and fasteners are prone to vibration loosening in a moving vehicle Loosen connections cause sparks 6 5 It is recommended to install a fuse with suitable rating connected to the battery positive terminal for safety CAUTION Surface is hot during operation 7 Installation for a Two Battery System Example for 12VD
7. e LED Module with Over Ride With the supplied Remote LED module w Over Ride accessory end user is constantly informed about the status of the Isolator whether it is in Connection Mode Isolation Mode Main Battery is above or at Alert low level and Isolator is in Protection Mode Selectable 12V or 24V system Selectable Ignition Control Wide range of programmable threshold voltages connect isolate alert with high resolution and respective delay time Monitoring of Main and House battery voltage in Isolation Mode 3 Intended Applications Caravan vehicle with second battery solar wind charging multiple battery banks This unit when using between two batteries it functions as an isolator as following It isolates the main starting battery from the house battery in normal operating condition It allows charging connect of the house battery only when the main battery voltage is higher than the selected Connect Voltage setting and or when ignition is switched on if this Ignition function is selected This way it also diverts excess power from the alternator to run equipment that feeds from the house battery It does not allow the house battery to power the car electronics or feed into the starting of the car unless the manual Over Ride Connection is activated It prevents excessively large charging current dumping into the depleted house battery from the main battery and rapid repeated on off by appropriate setting of the threshold
8. er ride switch will connect main and house terminal irrespective ignition control is on or off 5 Operation of MB 3688 The LED display and Remote Alert signal port Normally the display is turned off to conserve energy press any one of the two buttons to operate When unit is in isolated disconnect mode the display shows O F F Press Button to view Main battery terminal voltage Press Button to view House battery terminal voltage When unit is in Connected mode the display shows on Only one voltage shared by both terminals is shown on the display Status of the unit such as Connect Isolate Protection can also be remotely indicated by the supplied accessory Remote LED Module connected to the Remote Alert signal port 5 1 Protection Diagnosis Table Display Icon Protection Causes Suggested Solution Self Recoverable or Manual Reset Over Voltage Main Terminal Check DC source voltage to Unit is self recoverable when Ou p Protection Voltage gt 16V main terminal main battery voltage lower Check load at terminal than 15 5V Over Current Over Over Current gt 120Amp_ Check house battery level Unit is self recoverable after 1 Load Protection ae f minute In case of O C P Look for possible intermittent h ircuit in the wiri occurs 3 times in a row a final OC P SDr creuen aes ene protection will lock up the unit until complete reset by dis
9. lied accessory Remote LED indicator with Override button to the above control port Neg A R LED Indicator Over ride Button CONNECT ISOLATE ALERT onc co vot CAEC 885 Black wire to Neg Negative ground Red wire to Main terminal Remote Override function Green wire to R Remote Override function Yellow wire to A LED indicator Remark In case the Remote Over ride Connection is not in operation please do not wire up Main terminal and R port 10 SPECIFICATIONS Battery Voltage System 12V System 24V System Isolator Setting Default Range Default Range Connect Voltage 13 7VDC 9 2 16VDC 27 4VDC 18 4 32VDC Isolate Voltage 12 8VDC 9 15 8VDC 25 6VDC 18 31 6VDC Alert Voltage 12 0VDC 9 15 9VDC 24 0VDC 18 31 8VDC Connect Delay 5 seconds 1 250 seconds 5 seconds 1 250 seconds Isolate Delay 5 seconds 1 250 seconds 5 seconds 1 250 seconds Alert Delay 10 seconds 1 250 seconds 10 seconds 1 250 seconds Isolator Setting Accuracy 0 2V Resolution 0 1V 1 seconds Operating Voltage 9 17VDC Nominal 18 34VDC Nominal Continuous Contact Current 120Amp Current draw in Isolate Mode Less than 30mA add approx 20mA when LED display is active Current draw in Combine Mode Less than 50mA add approx 20mA when LED display is active Voltage drop with 120A Main battery to Aux battery 130mV Pr
10. otections System Under Voltage Disconnect Auto reconnect when condition returns to normal System Over Voltage Disconnect Auto reconnect when condition returns to normal System Overload and Short Circuit Disconnect complete reset by disconnect and reconnect the battery Unit Over Temperature Disconnect Auto reconnect when condition returns to normal Advance Feature Ignition Control Yes Default as OFF Normal Open Close N O N C Yes Default as normal open Remote Alert Provision for LED Indication Yes System Voltage 100mA Max Conditional Manual Over ride connect Mode Yes Remote Input 12VDC Yes Remote Input 24VDC Main Battery and House Battery Voltage Display When unit in Isolated Mode Operating Temperature Range 20 C to 60 C Operating Humidity 10 to 90 RH non condensing Environmental Protection IP67 Internal Component only Approval CE EN 61000 6 1 EN 61000 6 3 EN 50498 Supplied Accessory Remote LED Module with Over Ride and 2M Cable Dimensions L x W x H 90 x 90 x 85 mm 3 5 x 3 5 x 3 4 inch Weight 0 6kg 1 3Ibs
11. r 24V when the unit is first activated Mode 2 is for adjusting the threshold values of voltages and the related delay time Mode 3 is to confirm change of system state such as normal open close ignition control and return to default factory setting The product will automatically exit with the new settings or return to the last set values after 10 seconds for Mode 1 and 20 seconds for Mode 2 and 3 First activate the unit by connecting Main Terminal to Positive and Neg to Negative of a 12V battery for 12V system and 24V battery for 24V system 4 1 Set Menu Mode 1 Setting of 12V or 24 V system Press the button to toggle 12V or 24V shown on Display Confirm your selection by pressing the button for 12V system to button for 24V system for a few seconds Display will show the software version to confirm setting then the battery voltage If no selection is done within 10sec unit will go back to last set system voltage Remark You have about 10 seconds to confirm your setting otherwise the product will go to the last set system voltage or factory default setting 4 2 Set Menu Mode 2 Viewing the Connect Voltage Isolate Voltage Alert Voltage Delay Time This is the most used Set Menu Mode You have to pair the top LED VOLT SEC with the bottom LED connect isolate amp alert to interpret the reading on the Display as shown in the following diagrams To enter into this mode
12. t this to the chassis ground of the negative grounded vehicle Ign Ignition control To turn ON OFF the isolator synchronized with car ignition switch Connect this to the spot which is powered up when the Ignition switch is on A External Alert Alarm port An external signal voltage to indicate the operation status of the unit It synchronizes with the Alert Voltage and delay time setting It gives out warning signal when unit is under protection On The unit is connected Off The unit is isolated Slow flash To alert you the main battery voltage lower than default 12 0V or your set alert voltage Fast flash Protection signal the unit is isolated R Remote Override terminal Use the supplied accessory Remote LED indicator with Override button which has a momentary contact switch To manually connect the Main and House terminal via a momentary contact switch or toggle switch see wiring diagram in section 7 After one make as in the case of momentary contact switch the connection of Main and House battery will last for about 20 seconds Use normal switch for continuous on off operation During Remote Override On condition display shows C O N to indicate connection Remark When use for emergency boosting up the starter battery main make sure to check voltage of house and main battery by pressing the buttons that the voltage of the house battery bank is higher than the starter battery 9 1 Connection of the supp
13. uttons when the unit is at OFF mode If house battery voltage is lower than the main battery it would not work and deplete the Main starting battery further Large current will generate high heat on the cable and terminals during the cranking so do not over crank Allow sufficient time after first Over Ride has been done It pays to investigate the real cause for the failure of starting the car and the draining out of the starting battery 1 General description This dual battery isolator is designed to be customized to meet your vehicle s specific application The DC power system of various types alternator main battery house battery and loading usage are numerous and also change with time It features the fine tuning of key voltages delay time set points and constant monitoring of each battery to provide the maximal charging and protection of your batteries The reliable and efficient Mosfet switching has minimal voltage loss resulting much less generated heat than diode based isolators Microprocessor Controlled circuit provides accurate monitoring finer tuning of voltage delay timer set points and more fail safe protection with diagnostic display 2 Advanced Features e Alert Voltage The additional Alert Voltage setting is to monitor the main battery voltage even when the unit in isolated mode and when the main battery voltage drops below the set Alert Voltage the Remote LED Module will out slow flashes to alert end user e Remot
14. voltages and delay times until O OVOOOOONO When it is used with one battery and a load it acts as a low voltage cut off to keep the battery from over discharge according to the selected voltages setting na nC Normally Open uses Connect Voltage as threshold voltage Main and House battery are normally disconnected voltage at the main battery reaches Connect Voltage This Normally Open is the factory preset and good for the isolator dual battery application Normally Close uses Isolate Voltage as the threshold voltage Main and House battery are normally connected until voltage at the main battery reaches Isolate Voltage This normally close setting is suitable for application with single load or connection is a priority in the first place until the DC source drops below the Isolate Voltage CONNECT ISOLATE ALERT co N O N C IGNITION FACTORY CONTROL DEFAULT R Remote Over ride Port for manual connection of the main and house terminal A Remote Alert Signal Port System Voltage 100mA max Ign Ignition Control Port Neg Negative Ground Port Main battery positive House battery positive Control buttons LED indicators to indicate the setting status 3 digits LED display to display batteries voltage status ON OFF set voltage and delay time set menu 4 Programming Operation of MB 3688 There are 3 types of Set Menu Mode Mode 1 is for selection of 12V o
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