Siemens SWT-3000 User Manual

PU3 Module SWT 3000 Equipment Manual
Page - 6 Edition p3_3_2x 08/09 © SIEMENS AG 2008
Mode of operation of the PU3f
The processor and analysis module PU3 can be divided into the functional units internal power
supply, analog line interfaces (LIA) with digital signal processor (DSP), Controller and digital line
unit (DLE) which intercommunicate via an interface.
Internal power supply
The internal power supply generates the voltages needed on the module that are not fed exter-
nally:
z Power supply voltages for the analog line interface
z Switched 12 V supply voltage for the relays on the IFC modules.
The 12 V operating voltage for the IFC modules can be switched from the controller and allows
selective disabling of the output relays. The operating voltages on the module are monitored. Loss
of a voltage generates a reset and alarm on the module.
Controller
The controller is the central element of the PU3. It directs communication with the analog line in-
terface, the digital line unit, the service interface for the service PC, the LAN or the alarm interface.
Equipment variants and user data can be loaded via the service interface or via the LAN interface.
The possible equipment variants for the DSP are administered by the SysWin service program.
The controller carries out the entire administration of memory space. The following memory chips
are available:
z EEPROM for user data
z SRAM for event memory and working memory
z FPROM for program memory
The controller also implements the data exchange in the transmit and receive direction with the in-
terface module IFC-D/P and IFC-S. Data from the IFC module is fed via an input buffer into a regis-
ter where it is read by the controller per interrupt. Data relating to the IFC module is also written by
the controller into this register per interrupt and reaches the IFC module via an output buffer.
If an error is detected in the SWT 3000 a message to this effect is output via an interface to the
alarm module ALRS. The ALRS is, however, only present in the stand-alone version of the
SWT 3000 unit. If the PU3f is in the PowerLink the alarms are forwarded to the CSP and the alarm
is output on the ALRS module of the PowerLink.
The analog line interface (LIA)
The LIA sets up to the connection of the module to the analog protection command transmission
and consists of a digital signal processor (DSP), operational amplifiers and analog switches.
The DSP generates the necessary command frequencies and communicates with the transmis-
sion interfaces. Depending on the equipment variant these are the interfaces to the IF and RF
modules, or to the copper line equipment CLE.
The command frequencies in the VF or IF1 range are also generated by the DSP accordingly.
Analog switches are used for switching over between VF and IF signal path. The switchover proc-
ess is controlled by the PU3 controller. All necessary information is loaded with the equipment vari-
ant via the service program and written into the DSP by the controller via an interface. During op-
eration this interface is used to transmit protection commands and parameters. The controller can
read and write DSP memory cells, and can also transfer commands and trigger various interrupts.

Siemens SWT-3000 Specifications

General

Brand	Siemens
Model	SWT-3000
Category	Industrial Electrical
Language	English