DCU20
User Manual rev. 21
Page 14/29
4 Installation
Warning: In order to avoid potentially hazardous situations including fire hazard, safety
recommendations must be followed. Only authorized staff can install the unit.
4.1 Connecting the input to the power supply
The DCU20 must be connected to a
DC power supply
rated between 12VDC and 28VDC with a
maximum
output current of 20A. Use only 60/75 Class I copper 1.5…2.5mm
2
wires stripped
6...7.5mm
. The tightening torque must be 0.5…0.6Nm.
Please respect the wiring polarity!
Note:
The input current is equal to the load current plus the current needed by the battery charger to
recharge the battery.
Caution: This input is designed to be connected ONLY to a short circuit protected power
supply; connecting a battery to this input or other DC sources with not defined current
limitation may seriously damage the unit or the load and even result in fire hazard.
4.2 Connecting the load
The DCU20 must be connected to a
DC load
rated between 12VDC and 28VDC / maximum 20A. Use
only 60/75 Class I copper 1.5…2.5mm
2
wires stripped 6...7.5mm. The tightening torque must be
0.5…0.6Nm.
Please respect the wiring polarity! Please check the load and the power supply are rating compliant.
4.3 Connecting the battery
The DCU20 must be connected to a battery with nominal voltage between 12VDC and 28VDC with up
to 150Ah capacity. Higher capacity batteries can also be used at the expense of a longer charging
time.
Use only 60/75 Class I copper 1.5…2.5mm
2
wires stripped 6...7.5mm. The tightening torque
must be 0.5…0.6Nm.
Caution: The battery shall be connected to the DCU20 through a 30A ATO fuse (or
equivalent). Even is the unit is electronically protected against short circuit it is mandatory to
use a fuse for safety reasons
.
Please respect the wiring polarity!
Avoid keeping the DCU20 connected to the battery for long time when not used. Although the current
consumption from the battery when the unit is OFF is very low (about 30µA) it can discharge the
battery in the long time.
4.4 Connecting the temperature sensor
An optional temperature sensor (P/N: WNTC-2MT) can be connected to its input on the front panel.
The temperature sensor is provided with 2m long cables and must be fixed to the battery body to
measure its temperature (an adhesive pad can be used). When the sensor is connected the battery
temperature is automatically displayed on the LCD and a temperature compensated charge is
activated when charging Lead-Acid batteries.
