TDK-Lambda UK
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How do you implement Fault Tolerance?
DIN Rail mount
For the example listed above, the simplest off-the-shelf solution is to use a diode "ORing" module and two power supplies. Here we are using TDK-Lambda's DIN rail mount DLP-PU module and two 24V 10A DLP240-24-1/E power supplies. (/uk/dlp)
Tip: When wiring the system, ensure that the cable lengths from the output of the power supplies to the ORing module are equal. This will help optimise the performance and life of the power supplies. See Figure 1 below.
Inside the diode ORing module are two diodes and two alarm relays. Even in the event of one power supply failing with an internal short circuit, the remaining unit will continue to deliver power. See Figure 2 below.
Tip: - It is important to identify power supply failure using the relay alarms to flag the need for maintenance. Engineers sometimes overlook this which can result in a second failure unexpectedly bringing the system down!
Rack Mount
System Engineers requiring more power are turning to the communications style racks. These sophisticated low cost systems allow power supplies to be hot-swapped and come completely self contained. An example of such a product is TDK-Lambda's HFE series. (/uk/hfe)
Advantages of this solution include:
- Easy mounting into a standard 19" rack
- All in one solution
- Hot swap capable (ORing diodes or MOSFET switches built-in)
- No tools are required for replacement of a supply
- High density, low profile (1.75")
- Off the shelf parts
- Fully safety approved
- All necessary warning signals included
- 12V, 24V, 32-36V and 48V outputs
Figure 1
ORing module
Figure 2
HFE series