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Description
概观
Essential details：8913-PS-AC DC input power supply
The 8910-PS-DC DC input power supply provides a regulated 12 V @ 4.9 A output from a DC input voltage range of 18.5 up to 36V. This input voltage range accommodates the typical 24 V DC supplies available on process plants worldwide.
This power supply is designed to mount directly on 8711-CA-NS or 8712-CA-NS node services carriers or on a 8717-CA-PS power supply carrier. On the node services carriers mentioned here, two positions are provided. This enables a second power supply to be mounted, under conditions where the user wants to provide additional power, or where a redundant power supply is required to provide maximum system availability.
DC IS module supply
Power Supply module 8920-PS-DC mounts on its own carrier (8724-CA-PS) and accepts a locally available 24 V dc (nominal) supply and converts it to 12 V dc for powering MTL8000 I/O modules that have intrinsically safe field wiring. Its 5 A output is capable of powering between six and twenty I/O modules, depending on the module types and their mix.
A number of 8920-PS-DC modules may be used together, within an MTL8000 node, in a load-sharing arrangement. Where power supply redundancy is required an additional supply module may be added in an “n+1” arrangement. Failure of any power supply is signalled to the Bus Interface Module.
8913-PS-AC
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8913-PS-AC DC input power supply
AC power supplies
The 8913-PS-AC and 8914-PS-AC supplies produce DC output power from a wide range of AC inputs. Both can be mounted in a Zone 2 or Division2 hazardous area which means that they can be used for a broad range of applications including supplying power to 8000 series modules.
System and Field power
The 8913-PS-AC is a dual output supply capable of producing 12 V and 24 V DC outputs of approximately 5 A.
For 8000 series products, the 12 V output can be used to supply system power to the node and also provide 24 V to power field devices via the field power bussing facilities on the 8000 series carriers.
The 8914-PS-AC has a single 24 V DC output with a 10 A capacity. This is ideal for powering a wide range of field devices.
With 8000 series products, it is normally distributed via the field power bus (see below).
Load sharing
A load sharing diode is built in to the 12V output of the 8913-PS-AC power supply and the 24V output of the 8914-PS-AC. This enables one or more of the same power supply type to be connected in parallel to share the load requirements.
Power health signalling
The 8913-PS-AC and the 8914-PS-AC supplies provide power health signals that can be routed to the BIM to warn of possible imminent power failure.
The 8913 provides the power health signal from its 12 V DC output.
