Rockwell Automation 1606-XLS960FE Power Supply Reference Manual - Manual (Page 23)

All parameters are specified at 48V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless noted otherwise.
Rockwell Automation Publication 1606-RM018A-EN-P — February 2014 23
Bulletin 1606 Switched Mode Power Supplies
25.4. Charging Batteries
This power supply is not recommended to charge lead-acid or maintenance free batteries. The recommended end-of-
charge voltage of 55.0V (at 20°C) for four 12V VRLA lead-acid batteries in series can not be supplied from the
1606-XLS960FE unit.
25.5. Output Circuit Breakers
Standard miniature circuit breakers (MCBs or UL1077 circuit breakers) are commonly used for AC supply systems and
may also be used on DC branches.
MCBs are designed to protect wires and circuits. If the ampere value and the characteristics of the MCB are adapted to
the wire size that is used, the wiring is considered as thermally safe regardless of whether the MCB opens or not.
To avoid voltage dips and under-voltage situations in adjacent 48V branches which are supplied by the same source, a
fast (magnetic) tripping of the MCB is desired. A quick shutdown within 10ms is necessary corresponding roughly to
the ride-through time of PLCs. This requires power supplies with high current reserves and large output capacitors.
Furthermore, the impedance of the faulty branch must be sufficiently small in order for the current to actually flow.
The best current reserve in the power supply does not help if Ohm’s law does not permit current flow. The following
table has typical test results showing which B- and C-Characteristic MCBs magnetically trip depending on the wire cross
section and wire length.
Fig. 25-5 Test circuit Maximal wire length *) for a fast (magnetic) tripping:
0.75mm² 1.0mm² 1.5mm² 2.5mm²
C-2A 74m 89m 146m 190m
C-3A 57m 79m 128m 163m
C-4A 43m 52m 73m 116m
C-6A 19m 25m 27m 57m
C-8A 8m 12m 17m 25m
C-10A 6m 9m 13m 19m
C-13A 3m 5m 7m 10m
B-6A 38m 52m 76m 113m
B-10A 18m 26m 38m 55m
B-13A 12m 19m 29m 42m
B-16A 6m 8m 12m 20m
MCB Power Supply
AC
DC
+
-
+
-
Load
Wire length
S1... Fault simulation switch
S1
B-20A 1m 2m 4m 5m
*) Remember to take into account twice the distance to the load (or cable length) when calculating the total wire length (+ and – wire).