20
Rockwell Automation Publication 1606-RM124A-EN-P - September 2021
DC/DC Converter - 48V/48V, 5 A, 240 W Reference Manual
The following test results indicate the maximal wire length for a magnetic
(fast) tripping. The wire length is always two times the distance to the load
(+ and – wire).
Battery Charging
The device can be used to charge lead-acid or maintenance free batteries. Four
12V SLA or VLRA batteries are needed in series connection.
To charge batteries, perform the following steps.
1. Verify that the ambient temperature of the device is below 45 °C (113 °F).
2. Set the output voltage, which is measured at no load and at the battery
end of the cable, precisely to the end-of-charge voltage.
3. Use a 10 A circuit breaker or blocking diode between the device and the
battery.
4. Verify that the output current of the device is below the allowed charging
current of the battery.
The return current to the device (battery discharge current) is typically
6 mA when the device is switched off (except when a blocking diode is used).
Series Operation
Devices of the same type can be connected in series for higher output voltages.
You can connect as many units in series as needed, if the sum of the output
voltage does not exceed 150V DC. Voltages with a potential above 60V DC must
be installed with protection against touching.
Avoid return voltage (for example, from a
decelerating motor or battery) that is
applied to the output terminals.
Keep a left/right installation clearance of
15 mm (0.6 in.) between two power
supplies. Do not install the power supplies
on top of each other. Do not use power
supplies in series and in mounting
orientations other than the standard
mounting orientation.
Electromagnetic interference (EMI) and inrush current increase when you use
multiple devices.
MCB
Type
Test Results for Wire Length, Max
0.75 mm
2
(19 AWG)
1 mm
2
(18 AWG)
1.5 mm
2
(16 AWG)
2.5 mm
2
(14 AWG)
C-2A
43 m (141.1 ft)
54 m (177.2 ft)
82 m (269 ft)
117 m (383.9 ft)
C-3A
21 m (68.9 ft)
28 m (91.9 ft)
41 m (134.5 ft)
66 m (216.5 ft)
C-4A
9 m (29.5 ft)
11 m (36.1 ft)
15 m (49.2 ft)
23 m (75.5 ft)
C-6A
3 m (9.8 ft)
3 m (9.8 ft)
4 m (13.1 ft)
6 m (19.7 ft)
B-6A
11 m (36.1 ft)
13 m (42.7 ft)
20 m (65.6 ft)
30 m (98.4 ft)
B-10A
2 m (6.6 ft)
2 m (6.6 ft)
3 m (9.8 ft)
4 m (13.1 ft)
MCB
DC/DC
Converter
DC
DC
+
-
+
-
Load
Wire length
S1... Fault simulation switch
S1
IMPORTANT
Use only matched batteries when putting 12V types in series.
Do not use the device for battery charging in mounting orientations other
than the standard mounting orientation, or in any other condition where a
reduction of the output current is required (for example, altitude).
End-of-charge voltage
55.6V
55V
54.3V
53.6V
Battery temperature
10 °C (50 °F)
20 °C (68 °F)
30 °C (86 °F)
40 °C (104 °F)
Unit A
Input
Output
Unit B
Input
Output
-
+
-
+
+
-
Load