LDX-U20 is a microprocessor controlled DC-UPS rated 20 A usable in 12 V or 24 V systems. LDX-U20 monitors the voltage supplied by a DC source and in case of power failure a backup battery is connected to the load. When powered externally the unit charges the battery by an integrated battery charger supporting various battery chemistries. Digital Power regulation, LCD interface Multiple user settable parameters BI VOLTAGE: 12 V or 24 V (intermediate voltages possible) Battery chemistry: Lead acid, nickel and lithium Maximum battery capacity 150 Ah Load current: 20 A Max. Multiple protections Remote ON/OFF or other remote control functions possible through INHIBIT input Cold start Automatic sensing of input voltage, load current and battery current Battery protection against reverse polarity connection and overcurrent Battery health monitoring system: measuring battery internal resistance, battery temperature, charge/discharge cycles and Coulomb counter User settable maximum backup time 4 keys and 1 color graphic CSTN LCD display Allows online device configuration Displays the LDX-U20 status and alarms USB communication port for remote monitoring and configuration Dry contacts Connection through USB interface Remote monitoring and configuration Firmware upgrade Same functionalities of the embedded user interface with the ease of the PC benefits Available for Windows and Android 2 LDX-U20 LDX-U20 11 - 28 VDC (10 - 29 VDC) 20 A 12 V or 24 V 5 A Input Voltage (Range) Rated (UL Certified) 11 - 28 VDC (10 - 29 VDC) Input Current Rated 20 A Standby Power < 3 W Rated Battery Voltage Other voltages possible by request 12 V or 24 V Lead Acid Battery Chemistries Nickel Lithium Maximum Battery Charge Current 5 A Allowed Battery Capacity up to150 Ah Maximum Battery Current 20 A (up to 35 A for 5 seconds) Load to Battery Switch Time < 5 s Overcurrent Battery Protections Deep discharge Reverse polarity Battery Health Monitor Battery Internal Resistance Range Using Kelvin connection 1 - 300 m Coulomb counter Battery temperature through optional 10 k NTC sensor Additional Monitoring Functions Battery operating time since installation Number of cycles 1.5 Inch Color Graphic LCD Used to indicate the units status and to access the configuration menus 4 Keys Used to program the unit and to access various menus Constantly ON: generic failure on the system, details on the LCD Red LED Blinking: battery backup function active May indicate units status (READY or on BACKUP model), battery failure (by toggling at 1 Hz) 2 Dry Contacts (Relays) Rated 30 V / 1 A Configurable for remote PC shutdown INHIBIT - Isolated remote ON/OFF input, active for 5 - 30 VDC BATTERY SENSE - recommended to have an accurate measurement of the battery internal resistance Other Interfaces Mini USB-B - connector to be used with POWERMASTER software T SENSE - optional, remote temperature sensor for battery charging (WNTC-2MT) tech.support psbel.com