Siemens SENTRON, Installation Manual

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 SENTRON 3/6 Bus Plug with Optional SEM3™ Package

Note:

 Cable management is highly recommended to avoid  

  damage or accidental disconnection of communication cables.  
  Siemens offers a cable management system to best protect  
  communication cable wiring. This system has catalog number  
  BPSCMK12 and may be routed on any flat surface or the busway  
  per user preference. This kit consists of 12 24-inch spines.

  2) CAT6 Ethernet cables are required to transmit data from the  
    SEM3™ controller to an upstream data management system.  
    The port labeled PC shown in Figure 5 is the data output port
     and should be used for connecting to upstream data   
    management systems. Multiple CAT6 cables may be   
    connected via an Ethernet switch shown in Figure 5 below 
  (sold 

separately).

Figure 5: SIEMENS Scalence 8-Port Ethernet Switch

  The output of this Ethernet switch may then be routed back to a  
  centralized building management system via CAT6 cable. Details  
  on this and other network topologies are described in Section  
 8.0.

6.4 OTHER SEM3™ COMPONENTS

 1) 

Current Transformers (CTs) for use

 in the SEM3™ system

     are 100 mA output and are self protecting/shorting. CTs are  
    factory installed in the bus plug. 

Any modification of factory  

    wiring will void the warranty. 

More information on Current  

    Transformers may be found in the 

SEM3™ User Manual

  found 

at 

www.usa.siemens.com/SEM3 

2) 

Meter Modules

 are single phase meters that collect energy  

    information via a SEM3™ CT. Meter modules are available  
    in either high (0.2%) or low accuracy (1%) versions. The  
    meter module snaps into a SEM3™ rack assembly, producing  
    an audible click when locked into position. The Meter Rack  
    provides a hard coded address for each meter module. Two  
    and three phase circuits require meter modules to be installed  
    contiguously in the rack. Gaps between modules prevent  
    multi-pole circuit output. Each module must have the phase  

6

    switch on the top of the module set to the phase that the  
    CT is metering. Phase A, B or C (Line 1, 2 or 3 respectively).  
    SEM3™ bus plugs, unless field-wired, are factory configured  
    with meter modules installed and circuit switches pre-set.  
    Additionally, a meter module configuration label is provided  
    on the bus plug cover showing phasing & circuit information,  
    see Section 7.3. 

Figure 6: SEM3™ Meter Module

Note:

 Once the meter module is placed into the meter rack

   and energized, the phase position will be indicated by a
   different color LED for each position. Colors are orange for phase
   A (line 1), yellow for phase B (line 2), green for phase C (line 3).  
  LED‘S are adjacent to the phase numbers. The power indication  
  LED also indicates communications by flashing. CT sizing for  
  each meter module will be done through the controller web  
  page configuration.

 3) 

Meter Racks

 have the addresses for the module to controller  

    communications hard coded into them. Three and six meter  
    racks are available in the SENTRON 3/6 Bus Plug.  The three  
    and six module racks have a rotary switch to allow them  
    to be configured for multiple address ranges. See section 7.3  
    for directions on addressing the racks and modules.

  4) The 

Controller 

functions as the set up interface for the  

    system. System settings, CT ratios, PT ratios, alarm settings,  
    communications settings and passwords are all set using the
     web page interface of the controller. See Section 7.1 for  
    directions on configuring the SEM3™ controller.