Siemens SENTRON, Installation Manual

12

s 

l

 SEM3™ Metered Bus Plug for SENTRON Busway Systems

600V Isolated 

Siemens Cable 

600V Isolated 

Siemens Cable 

600V Isolated 

Siemens Cable 

600V Isolated 

Siemens Cable 

600V Isolated 

Siemens Cable 

600V Isolated 

Siemens Cable 

CAT6 Cable 

CAT6 Cable 

CAT6 Cable 

Metered Bus Plug 2 

Metered Bus Plug 1 

Metered Bus Plug 3 

Controller Bus Plug 1 

Metered Bus Plug 4 

Metered Bus Plug 5 

Metered Bus Plug 6 

Controller Bus Plug 2 

Controller Bus Plug 3 

8 Port Ethernet Switch 

CAT6 Cable 

Power Monitoring System/Building 

Management System/SCADA 

The function of the Ethernet switch is to aggregate signals being 

generated by each SEM3 controller. Each SEM3 controller bus plug may 

monitor up to 42 poles. Metered bus plugs may have between 1 and 6 

metered poles. SEM3 may also be embedded in other electrical 

equipment such as switchboards or panels, providing a comprehensive 

power monitoring solution. 

8.0 Sample Network Topology

Many applications consist of long straight runs of busway 
with regularly spaced bus plugs. In the above diagram, a 
segment of a typical typical busway application is shown. In 
this case the end user has requested six pole metering in 
each bus plug. The run above consists of 7 six pole plugs, 
meaning 42 poles are monitored by the one controller bus 
plug located in the middle of the run. 

Note that this configuration is within the 45 meter limitation 
for the maximum number of poles monitored by one SEM3™ 
controller. Additionally the maximum length of 600V isolated 
communication cable for 24 meters or more is 60 feet. Five 
plugs fit on every 10 foot section of bus, meaning the 
configuration is well within the 60 foot limit. 

The rotary switches on the racks are set to unique identifiers 
for each rack, ranging from 

0

 in the left-most plug to 

7

 in the 

right. The isolated communication cable is "daisy chained" 

from plug to plug on the rear surface. Isolated 
communications cable enters the control module through 
the ports labeled 

R1

 and 

R2

. This input completes the first 

level of data aggregation at the controller level. 

A CAT6 Ethernet cable, with maximum suggested length of 
200 feet, exits the 

PC

 port of the controller plug. An Ethernet 

switch is used to aggregate data from multiple controllers 
located throughout the facility. These controllers are located 
in bus plugs, switchboards, and wall mounted units to 
monitor existing power cable runs. The Ethernet switch acts 
to consolidate the data, and routes it via CAT6 to a master 
building management system.