Rockwell Automation 1606-XLE480EPC Power Supply Reference Manual - Manual (Page 22)

22 Rockwell Automation Publication 1606-RM001B-EN-P - August 2013
Bulletin 1606 Switched Mode Power Supplies
23.7 Series Operation
Power supplies of the same type can be connected in series for higher output voltages. It is
possible to connect as many units in series as needed, providing the sum of the output voltage
does not exceed 150Vdc. Voltages with a potential above 60Vdc are not SELV any more and
can be dangerous. Such voltages must be installed with a protection against touching.
Earthing of the output is required when the sum of the output voltage is above 60Vdc.
Avoid return voltage (e.g. from a decelerating motor or battery) which is applied to the output
terminals.
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 series in mounting orientations other than the standard mounting orientation (terminals on bottom of the unit).
Pay attention that leakage current, EMI, inrush current, harmonics will increase when using multiple power supplies.
23.8 Inductive and Capacitive Loads
The unit is designed to supply any kind of loads, including capacitive and inductive loads. If extreme large capacitors, such as EDLCs (electric double layer capacitors or “UltraCaps”) with
a capacitance > 0.5F are connected to the output, the unit might charge the capacitor in the Hiccup
PLUS
mode (See Output on page 6 ).
23.9 Charging of Batteries
The power supply can be used to charge lead-acid or maintenance free batteries. (Two 12V batteries in series)
Instructions for charging batteries:
a. Set output voltage (measured at no load and at the battery end of the cable) very precisely to the end-of-charge voltage.
b. Use a 30A or 32A circuit breaker (or blocking diode) between the power supply and the battery.
c. Ensure that the output current of the power supply is below the allowed charging current of the battery.
d. Use only matched batteries when putting 12V types in series.
e. The return current to the power supply (battery discharge current) is typ. 23mA when the power supply is switched off (except in case a
blocking diode is utilized).
End-of-charge voltage 27.8V 27.5V 27.15V 26.8V
Battery temperature 10°C 20°C 30°C 40°C
Unit A
AC
DC
Unit B
AC
DC
-
+
-
+
Load
+
-
Earth
(see notes)