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Rockwell Automation Publication 1606-RM101A-EN-P - July 2020
Parallel Use to Increase
Output Power
1606-XLE240E power supplies can be paralleled to increase the output power.
The output voltage of all power supplies shall either be adjusted to the same
value (±100 mV) with the same load conditions on all units, or the units can be
left with the factory settings. There is no feature included that balances 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 means no harm to this power supply as long as the ambient
temperature stays below 40 °C (104 °F).
If more than three units are connected in parallel, a fuse or circuit breaker with
a rating of 15 A or 16 A is required on each output. Alternatively, a diode or
redundancy module can also be used.
Energize all units simultaneously to avoid the overload HiccupPLUS mode. It
also might be necessary to cycle the input power (turn off for at least five
seconds), if the output was in HiccupPLUS mode due to overload or short
circuits and the required output current is higher than the current of one unit.
Restrictions: Keep an installation clearance of 15 mm (0.59 in.) (left / right)
between two power supplies and avoid installing the power supplies on top of
each other. To use power supplies in parallel, ensure the following:
•
The power supplies are in the standard mounting orientation (terminals
on bottom of the unit).
•
The power supplies are not in any condition where a derating of the
output current is required, such as altitude.
Leakage current, EMI, inrush current, harmonics increase when using
multiple power supplies.
Figure 41 - Parallel Use to Increase Output Power
Unit A
AC
DC
Unit B
AC
DC
-
+
-
+
Load
+
-