Aris Power DCU series of DC-UPS feature an All-In-One architecture, including Power supply + Battery charger + Back-up functions, all packaged in one  casing.

The DCU directly takes mains input voltage and manages load and battery requirements.  Other market devices instead have low voltage input and must be energized by an external power supply unit.DCU devices are therefore more functional than most others and allow more compact, cost-effective backup solutions.

One of the main benefits of the DCU DCUPS device is that it has selectable output voltage, 12 Vdc or 24 Vdc. The same unit can therefore support a wide range of applications.

Before powering on the device, select the correct output voltage to match load and battery rated voltage. 12 Vdc or 24 Vdc. Available in the range are also DCU with 48 V output, single set value.

The sharing of the DCU rated current IR between Load (IL) and Battery (IB) is not fixed. The priority task of the DC-UPS is ensuring the continuity of load power supply, no matter what the setting of battery maximum charging current is.

The current delivered to the battery may vary to accommodate load demand first. When load demands more than its designed rated current, if necessary, battery charging will stop or will be limited for the duration of the overload. It will be resumed once the transient is over. See example:

The BATTSafe DC-UPS firmware includes a full connectivity interface to allow remote monitoring and control of the system. The DC-UPS can communicate with a PLC or a higher-level controller either serial port
on the front of the DCU, these are RJ45 connections. The interface is designed for MODBus-RTU communication protocol.

The device is ready configured to enable communication. Set of parameters available communication protocol and map of registry are available and open.

The DC-UPS is equipped with built-in alarms contacts, as follows:

• Mains/Backup
• Battery Fault
• Rectifier Failure

The three alarms are on dry change-over relay contacts and are brought to push-in terminals on the front of the device.

During installation, operation and maintenance,device and system faults are also detected by auto-diagnostic features. Detected battery faults:

• Reverse Polarity connection
• Disconnected Battery
• Disconnected or missing Battery
• Detection of Wrong Battery Voltage
• Battery Cell in short circuit
• Wiring High impedance

• Life Test failed, replace sulfated battery
• Low Battery Voltage
• Battery almost discharged
• Battery fully discharged

Detected device/system faults:

• Overload or Short circuit on load output, standby
• Overload or Short circuit on load output, backup
• Rectifier failure
• Device internal failure

Three, three-colour LED indicators are available for visual monitoring of the DC-UPS on the device front.

• Mains/Backup LED
• Fault LED
• Battery LED

With blinking code, they provide a full set of status and diagnostic information, useful during installation and on-site inspection. For LED signaling and the corresponding states.

Automatic

If the function has been enabled on the dipswitch, every two hours, while in Standby-Float charge, the DCU automatically performs battery life test.

Manual

Life test can also be performed on demand by manually pressing the Battery Start/Test push button for 10s. The DCU will run a full life test and negative or positive result will be shown by a blinking code on the LEDs.

The DCU is designed to perform temperature compensation of battery charging voltage. This feature optimizes battery efficiency and is a requirement often induced by norms such as EN54-4 fire protection norm or other equivalent international norms. This feature is enabled by connecting the Smart Battery Sensor accessory to the dedicated connector on top of the device.

SBS is a built-in feature of Aris Power SBS-BBX battery boxes range. It also carries out battery block voltage equalization. Use the cable SBS002 to connect DCU and BBX. In case the DCU is charging a customer provided battery pack, the SBS001 sensor and cable shall be used.

Universal Charger

BATTSafe firmware includes factory-set charging curves for the most common battery types: Vented Lead Acid, AGM and Gel Lead Acid, Ni-Cd, Li-Io.

Automatic multi-stage IUoU Charger

BATTSafe performs automatic multi-stage charging following a stabilized voltages and stabilized current IUoU curve.

Recovery - flat batteries, when not irreversibly damaged, can be recovered. Fast Charge - If fast charging is required and compatible with the application, it can be enabled.

By default when in Backup mode, DCU will keep energizing the load until the battery is discharged, that is, LVD threshold is reached.

However, backup time requirement may be shorter than the time needed to reach LVD. To prevent unnecessary battery cycling in such cases, the DCU allows setting shorter backup times via the Buffer Time selector.

When the factory default setting is changed, please refer to the table below for the corresponding buffer time selected.

The maximum Buffer Time duration depends on the battery capacity rating and status of charge. Assuming backup occurs when the battery is fully charged, the times given in the table below can be used as reference.

The DCU architecture allows very high transient overloading capability and is therefore suitable for backup of DC loads with high inrush current.When load demands more than rated, Power Boost is enabled. The battery will start contributing to load power.

During Standby mode, part of the Power Boost will come from the mains via the DCU, part will come from the battery.

During Backup mode all Power Boost will come from the battery.

Unless the device is in Power Supply mode (i.e. without battery), when Boost is equal to +20% of IR. During the other modes, if the battery is fully functional, Power Boost will be limited in time according to overload current intensity.

To maximize battery Lifetime, the DCU disconnects the battery when it reaches the Low Voltage Disconnect threshold (LVD), preventing battery damages due to deep discharge.

Below this value, the device will autonomously switch off to prevent unnecessary discharge and consequent battery shorter life.