Rockwell Automation 1606-XLP60EQ Power Supply Reference Manual - Manual (Page 19)

All parameters are specified at 24V, 2.5A, 230Vac input, 25°C ambient and after a 5 minutes run-in time, unless noted otherwise.
Rockwell Automation Publication 1606-RM007A-EN-P - February 2014 19
Bulletin 1606 Switched Mode Power Supplies
22.3. Charging Batteries
The power supply can be used to charge lead-acid or maintenance free batteries. (Two 12V batteries in series.)
Instructions for charging batteries (float charging):
a) Ensure that the ambient temperature of the power supply is below 45°C
b) Set output voltage (measured at no load and at the battery end of the cable) very precisely to the end-of-charge
voltage.
End-of-charge voltage 27.8V 27.5V 27.15V 26.8V
Battery temperature 10°C 20°C 30°C 40°C
c) Use a 4A circuit breaker (or blocking diode) between the power supply and the battery.
d) Ensure that the output current of the power supply is below the allowed charging current of the battery.
e) Use only matched batteries when putting 12V types in series.
f) The return current to the power supply (battery discharge current) is typical 7.3mA when the power supply is
switched off (except when using a blocking diode).
22.4. External Input Protection
The unit is tested and approved for branch circuits up to 20A. An external protection is only required, if the supplying
branch has an ampacity greater than this. Check also local codes and local requirements. Local regulations may apply
If an external fuse is necessary or used, minimum requirements need to be considered to avoid nuisance tripping of
the circuit breaker. A minimum value of 10A B- or 6A C-Characteristic breaker should be used.
22.5. Parallel Use to increase Output Power
Unit A
AC
DC
Unit B
AC
DC
-
+
-
+
Load
+
-
1606-XLP60EQ power supplies can be paralleled to increase the output power.
This power supply does not include the capacity to balance the load current
between the power supplies. Usually the power supply with the higher
adjusted output voltage draws current until it goes into current limitation. This
causes no harm to the power supply as long as the ambient temperature stays
below 45°C. The 1606-XLP60EQ can also be paralleled with other power supplies
from the XLP family with 24V output voltage. The output voltages of all
power supplies shall be adjusted to the same value (±100mV).
A fuse or diode on the output of each unit is required only if more than three units are connected in parallel. If a fuse
(or circuit breaker) is used, choose one with approximately 150% of the rated output current of one power supply.
Keep an installation clearance of 15mm (left / right) between two power supplies and avoid installing the power
supplies on top of each other. Do not use power supplies in parallel in mounting orientations other than the standard
mounting orientation (input terminals on the bottom and output terminals on top of the unit).
Be aware that leakage current, EMI, inrush current and harmonics will increase when using multiple power supplies in
parallel.
in some countries.