Rockwell Automation 1606-XLS960FE Power Supply Reference Manual - Manual (Page 25)

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 25
Bulletin 1606 Switched Mode Power Supplies
25.8. Series Operation Unit A
AC
DC
Unit B
AC
DC
-
+
-
+
Load
+
-
Earth
(see notes)
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 no longer SELV and may be dangerous.
Such voltages must be installed with a protection against touching.
Grounding of the output is required when the sum of the output voltage
exceeds 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 the bottom of the unit).
Please note that leakage current, EMI, inrush current, harmonics will increase when using multiple power supplies.
25.9. 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 > 1F are connected to the output,
the unit might charge the capacitor in the Hiccup
PLUS mode (see section 6).
25.10. Back-feeding Loads
Loads such as decelerating motors and inductors can feed voltage back to the power supply. This feature is also called
return voltage immunity or resistance against Back- E.M.F. (Electro Magnetic Force).
This power supply is resistant and does not show malfunctioning when a load feeds back voltage to the power supply.
It does not matter whether the power supply is on or off.
The maximum allowed feed-back-voltage is 63Vdc. The absorbing energy can be calculated according to the built-in
large sized output capacitor which is specified in section 6.