2
System Description
DCW20 is a microprocessor controlled unit that can perform 2 functions:
1. UPS rated 960W/20A usable in any system rated 12…48Vdc
2. DC/DC converter (non isolated) rated 960W/20A usable in any combination of IN/OUT voltages 12…48Vdc
For the UPS function you may use 1 battery of 12V, independently of the operating load voltage. For any supply voltages (12…48Vdc) it may use also multiple battery configuration (10…58Vdc).
DCW20 monitors the voltage coming from a DC power supply and in case of power failure a backup battery is supplying the energy to the load. In normal condition the battery is kept charged by
an integrated battery charger supporting various battery chemistries.
As a DC/DC converter (no battery present) the input has to be connected to the battery connector.
The input voltage is converted to any output voltage as per the set-up.
Connections and User interface
1
.
Alarm LED indicator
:
ON
when the unit is in backup. Blinks at 1Hz rate in case of
error.
2
.
Modbus RTU over USB
: Used to connect a PC running POWERMASTER or custom
application for remote monitoring and controlling. Firmware update is also possible
through USB connection.
3
.
Temperature sensor
: Optional temperature sensor (P/N: WNTC-2MT) to measure
the battery temperature for protection and temperature compensated charge method.
4
.
Relays dry contacts
: 2 relays are present for remote monitoring.
5
.
Modbus RTU over RS485
: Used to connect a PC running for remote monitoring and
controlling. Firmware update is also possible through RS485 connection.
6
.
Inhibit input
: A voltage between 5VDC and 30VDC applied to this input activates the
inhibit function.
7
.
Auxiliary output supply
: Maximum 5A supply from the battery (unregulated).
8
.
Input connection
: 2 poles are provided for input connection. This must be
connected to a power supply rated 12…48VDC.
9
.
Output connection
: 2 poles are provided for output connection. It must be
connected to the load to be backed up.
10
.
Battery connection
: 2 poles are provided for battery connection. This must be
connected to the battery. Please respect the correct polarity.
11. Display area:
provides information regarding the device status.
12
.
Control keys:
4 push buttons are provided to navigate through the menus and to
select the various functions.
User Interface
Symbols
Name
Function / Description
MENU Key
Scrolls between menus.
DOWN Key Scrolls down menus and values.
UP Key
Scrolls up menus and values.
OK Key
Confirms selection.
INPUT
The measured input voltage and current is shown in this section.
OUTPUT
The measured output voltage and current is shown in this section.
BATTERY
The battery voltage, current, temperature, resistance and charge are shown in this section. During charging and discharging the symbol
background color changes to orange and the number of bars drawn inside reflects the charge status. During discharging and charging an
arrow drawn beside the symbol reflects the direction of the current flowing through the battery, pointing towards the battery during
charging. Battery section is not present in DC-DC mode.
AUXILIARY
The measured auxiliary output voltage and current is shown in this section.
MODE displayed
UPS status screen
DC-DC status screen
Alarm screen
Summary of Contents for DCW20
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