DCW20
960W DIN Rail Combo DC-UPS / DC-DC Converter
POWERMASTER
DCW20 is a microprocessor controlled unit that can perform 2 functions:
A) DC-UPS rated 960W/20A usable in any system 12…48Vdc
B) DC/DC converter (non isolated) rated 960W/20A usable in any combination of IN/OUT voltages 12…48Vdc
For the UPS function it 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…60Vdc).
DCW20 monitors the voltage coming from a DC power supply and in case of power failure a backup storage source supplies 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 voltage is converted to any output voltage as per the set-up (programmable by front keys or
communication interfaces).
Features
 Main
Digital power regulation, LCD interface
 Integrated battery charger for 12…48V multi-chemistries batteries with
a charging current up to 20A
 Can operate with super capacitors modules
 Battery voltage independent of input and output voltage
 20A or 960W rated load
 Multiple protections
 Remote ON/OFF or other remote control functions possible through
INHIBIT input
 Measures voltages and currents on input, output and battery.
 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
 Auxiliary output with same voltage as battery (5A max.), protected
against overcurrent/shortcircuit
DCW20 – Rev.V3.0
user interface
 Embedded
4 keys and 1 color graphic TFT LCD display




Allows online device configuration
Displays the DCW20 status and alarms
Modbus over RS-485 and USB interfaces for control and monitoring
Dry contacts for programmable status signals
for POWERMASTER software
 Suitable
Connection through USB and RS-485 interfaces
 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
Page 1/4
DCW20
960W DIN Rail Combo DC-UPS / DC-DC Converter
TECHNICAL DATA
Model type
INPUT DATA
DCW20
Nominal: 12…48Vdc
Range: 10…60Vdc
20A
< 4W
Input DC voltage
Input DC current
Standby power
MAIN OUTPUT SECTION
Nominal: 12…48Vdc
(= Vin for use as UPS; according to set-up for use as DC/DC converter)
20A / 960W
± 1%
Voltage
Maximum Current / Power
Load regulation
AUXILIARY OUTPUT SECTION
Nominal: 12…48Vdc
(= U battery - non regulated)
5A
6A
Voltage
Continuous current
Overload limit
BATTERY SECTION
Battery voltage
(or to be used as input for DC/DC conversion)
Battery chemistries
Nominal: 12…48Vdc
Range: 10…60Vdc




Lead Acid
Nickel
Lithium
Supercap capacitors
Maximum battery charge current
Maximum battery discharge current
Allowed battery capacity
Battery protections
20A
20A
up to 400Ah



Overcurrent
Deep discharge
Reverse polarity




Coulomb counter
Battery temperature through 10kΩ NTC sensor (optional WNTC-2MT)
Battery operating time since installation
Number of cycles
BATTERY HEALTH MONITORING
Battery internal resistance range
Additional monitoring functions
1mΩ…300mΩ
USER INTERFACE
1.5 inch color graphic LCD
Used to display the unit’s status and to access the configuration menus
4 keys
Used to program the unit and to access various menus
Red LED


Constantly ON: generic failure on the system, details on the LCD
Blinking: battery backup function active
2 dry contact relays
(NO, 30Vdc / 1A)


RL1 / RL2 - Configurable
RL COM - Common Pin
Other interfaces



INH - (INHIBIT) Isolated remote ON/OFF input, active for 5…30Vdc
T SENSE - optional, remote temperature sensor for battery charging (WNTC-2MT)
Modbus over USB and RS-485 interfaces
GENERAL DATA
Efficiency at full load
Power loss (in UPS mode with Vin present)
Efficiency at full load
Power loss (in UPS mode during backup)
Efficiency at full load
Power loss (DC-DC mode)
Battery charge efficiency
Power loss
Maximum backup time
Operating temperature¹²
> 98%
< 7W
> 97%
< 15W
> 97%
< 15W
> 96%
< 20W
User programmable, up to battery deep discharge threshold
-40°C…+70°C
Temperature and voltage derating
See charts on Fig.1
Storage temperature
-40°C...+80°C
Humidity
5…95% r.H. non condensing
Life time expectation
281’904h (32.2 years) at 25°C ambient full load
MTBF

MIL-HDBK-217F
Overvoltage category
Pollution degree


EN50178
IEC60664-1
I
2
> 600'000h at 25°C ambient full load
Safety Standards


UL508
EN60950
(reference)
(reference)
EMC Emission


EN55011 (CISPR11)
EN55022 (CISPR22)
Class B
Class B
EMC Immunity




EN61000-4-2
EN61000-4-3
EN61000-4-4
EN61000-4-5
Level 3
Level 3
Level 3
Level 1
Protection degree

EN60529
IP20
Vibration sinuosoidal

IEC 60068-2-6
(5-17.8Hz: ±1.6mm; 17.8-500Hz: 2g 2hours / axis (X,Y,Z)
Shock

IEC 60068-2-27
(30g 6ms, 20g 11ms; 3 bumps / direction, 18 bumps total)
Isolation against enclosure
DCW20 – Rev.V3.0
0.75kVdc
Page 2/4
DCW20
960W DIN Rail Combo DC-UPS / DC-DC Converter
IN/Battery/OUT Connection terminals
2.5mm² (24…12AWG), screw type, pluggable
Auxiliary connection terminals
Up to 0.75mm² (18AWG), spring type, pluggable
Temperature sensor connector
Friction lock connector
Mini USB-B Type (virtual Com Port)
RS-485 through auxiliary connector
Communication interface connector
Case material
Aluminum
Weight
0.50kg
Size (W x H x D)
54.0 x 115.0 x 110.0mm
1) Start-up type tested: - 40°C, possible at nominal voltage with load deration.
2) For temperature ≤ - 20°C the LCD is not operating, but the unit will operate correctly.
Notes:
- For more details, performance and descriptions regarding all parameters not indicated in the above table, please refer to the user manual downloadable from www.nextys.com
- Technical parameters are typical, measured in laboratory environment at 25°C, 24Vdc input and 24V lead acid battery, at nominal values, after minimum 5 minutes of operation.
- Power rating, losses, efficiency, ripple, thermal behaviour and start-up may change outside of the nominal rated input range. Contact factory for details.
- Data may change without prior notice to improve the product.
Fig.1
Current Derating Curve
25
Current [A]
20
15
10
5
0
-40
-30
-20
-10
0
10
20
30
40
50
60
70
30
40
50
60
70
Temperature [°C]
12V and 24V
48V
Power Derating Curve
1080
960
840
Power [W]
720
600
480
360
240
120
0
-40
-30
-20
-10
0
10
20
Tem perature [°C]
12V
DCW20 – Rev.V3.0
24V
48V
Page 3/4
DCW20
960W DIN Rail Combo DC-UPS / DC-DC Converter
DIMENSIONS
CONNECTION
Main Connections:
Auxiliary Connections:
IN: (connect to power supply
in UPS mode)
 + = Positive DC
 - = Negative DC
RL1 / RL2: (programmable dry contact)
 RL1 = NO
 RL2 = NO
 RL COM = COM
BATT/IN: (connect to battery
in UPS mode or power supply
in DC/DC mode)
 + = Positive DC
 - = Negative DC
Modbus: (over RS-485, 2 wire interface)
 MBUS A = RX/TX
 MBUS B = RX/TX
 GND = Common
OUT: (connect to load)
 + = Positive DC
 - = Negative DC
INHIBIT: (5…30Vdc)
 INH+ = Positive DC
 INH- = Negative DC
Mini USB-B Type





1 = VBUS (+5V)
2 = Data (D-)
3 = Data (D+)
4 = Not connected (ID)
5 = GND
AUX: (12…48Vdc not regulated 5A Max.)
 AUX + = Positive DC
 AUX - = Negative DC
T SENSE: (remote temperature sensor for
battery charging)
 Optional WNTC-2MT
DCW20 – Rev.V3.0
Page 4/4
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