Rockwell Automation Publication 1606-RM055B-EN-P - February 2017
17
Basic Power Supply 5 A
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 150V DC. Voltages with a
potential above 60V DC 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
60V DC.
Avoid return voltage (for example, from a decelerating motor or battery) which
is applied to the output terminals.
Keep an installation clearance (left/right) of 15 mm (0.59 in.)between two
power supplies and avoid installing the power supplies on top of each other.
Pay attention that leakage current, EMI, inrush current, harmonics increase
when using multiple power supplies.
Figure 20 - Series Operation
Inductive and Capacitive Loads
• No limitations for inductive loads.
• No limitations for capacitive loads in combination with an additional
resistive type of load.
• Limitations apply for capacitive loads in combination with constant
current type of loads:
– 20 mF Max with an additional 2.5 A constant current load and
– 10 mF max with an additional 5 A constant current load.
Charging of Batteries
Do not use the power supply to charge batteries.
Unit A
AC
DC
Unit B
AC
DC
-
+
-
+
Load
+
-
Earth
(see notes)
