Rockwell
Automation
1606-XLE80E-2 24V, 3.3A; Single Phase Input
10000108328
(Version 00)
www.ra.rockwell.com
Page 19
26.6.
S
ERIES
O
PERATION
The power supply can be put in series to increase the output voltage.
Fig. 26-5 Schematic for series operation
Instructions for use in series:
Earth
Unit A
AC
DC
Unit B
AC
DC
-
+
-
+
Load
+
-
a)
It is possible to connect as many units in series as needed, providing the sum
of the output voltage does not exceed 150Vdc.
b)
Warning ! 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.
c)
For serial operation use power supplies of the same type.
d)
Earthing of the output is required when the sum of the output voltage is above
60Vdc.
e)
Keep an installation clearance of 15mm (left/right) between two power supplies
and avoid installing the power supplies on top of each other.
Note: Avoid return voltage (e.g. from a decelerating motor or battery) which is
applied to the output terminals.
26.7.
P
ARALLEL
U
SE TO
I
NCREASE
O
UTPUT
P
OWER
The power supply shall not be used in parallel to increase the output power.
26.8.
P
ARALLEL
U
SE FOR
1+1
R
EDUNDANCY
Power supplies can be paralleled for 1+1 redundancy to gain a higher system reliability. Redundant systems require a certain amount of extra power to
support the load in case one power supply unit fails. The simplest way is to put two 1606-XLE power supplies in parallel. In case one power supply unit
fails, the other one is automatically able to support the load current without any interruption. This simple way to build a redundant system has two major
disadvantages:
a.
The faulty power supply can not be recognized. The green LED will still be on since it is reverse-powered from the other power supply.
b.
It does not cover failures such as an internal short circuit in the secondary side of the power supply. In such a - situation the defective unit
becomes a load for the other power supplies and the output voltage can not be maintained any more.
This above conditions can be avoided by utilizing decoupling diodes which are included in the decoupling module 1606-XLSRED or redundancy module
1606-XLERED.
Other recommendations for building redundant power systems:
a)
Use separate input fuses for each power supply.
b)
Monitor the individual power supply units. A DC-ok lamp and a DC-ok contact is included in the redundancy module 1606-XLERED. This feature
reports a faulty unit.
c)
When possible, connect each power supply to different phases or circuits.
26.9.
E
XTERNAL
I
NPUT
P
ROTECTION
The unit is tested and approved for branch circuits up to 20A. External protection is only required if the supplying branch has an ampacity greater than
this. In some countries local regulations might apply. Check also local codes and requirements.
If an external protective device is utilized, a minimum value is required to avoid undesired tripping of the fuse.
B-Characteristic
C-Characteristic
Ampacity max.
20A
20A
min.
10A 6A
