Rockwell Automation Publication 1606-RM124A-EN-P - September 2021
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DC/DC Converter - 48V/48V, 5 A, 240 W Reference Manual
Parallel Use to Increase
Output Power
Devices can be connected paralleled to increase the output power. You can
adjust the output voltage to the same value (±100 mV) with the same load
conditions on all devices, or the devices can be left with the factory settings.
The ambient temperature cannot exceed
45 °C (113 °F).
If more than three devices are connected
in parallel, a fuse or circuit breaker with
a rating of 10 A is required on each
output. A diode or redundancy module
can also be used.
Keep a left/right installation clearance of
15 mm (0.6 in.) between two power
supplies. Do not install the power
supplies on top of each other. Do not use devices in parallel in mounting
orientations other than the standard mounting orientation, or in any other
condition where a reduction of the output current is required (for example,
altitude).
EMI and inrush current increase when you use multiple devices.
Parallel Use for Redundancy
These devices can be parallel used for two types of redundancy. For a wiring
example of either redundancy configuration, see
, both
on
1+1 Redundancy
Devices can be paralleled for 1+1 redundancy to gain higher system availability.
Redundant systems require a certain amount of extra power to support the
load in case one device fails. The simplest way is to put two devices in parallel.
This is called a 1+1 redundancy. In case one device fails, the other one is
automatically able to support the load current without any interruption. It is
essential to use a redundancy module to decouple devices from each other.
This redundancy helps prevent the defective unit from becoming a load for the
other device, which helps confirm that the output voltage can be maintained.
EMI and inrush current increase when you use multiple devices.
The following recommendations are for building 1+1 redundant power systems:
•
Whenever possible, use separate supply systems for each device.
•
Monitor the outputs of each device. Use the DC-OK lamp or the DC-OK
contact, which are included in the Cat. No. 1606-XLERED Redundancy
Module.
•
Set the output voltages of all devices to the same value (± 100 mV), or
leave them at the factory setting.
•
The ambient temperature cannot exceed 70 °C (158 °F).
N+1 Redundancy
Redundant systems for a higher power demand are built in an N+1 method,
such as four devices with each rated for 10 A are paralleled to build a 30 A
redundant system.
EMI and inrush current increase when you use multiple devices.
Unit A
Input
Output
Unit B
Input
Output
-
+
-
+
+
-
Load