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Configuring the system
There are a few steps in configuring the components of the SEM3 metering system.
Refer to the Installation Manual instructions on mounting of the SEM3 components.
Current Transformer (CT)
– There is no setting on the CT for the system. The CTs for
use in the SEM3 meter system are 100 mA output and are self protecting so shorting
blocks are not required. Standard CT wire length is 6 feet. CT wire length can retain
accuracy up to 100 feet using 18 AWG twisted pair wire.
Meter modules
– These instructions are for both levels of accuracy modules.
Each meter module is a single phase meter and must be connected to the
appropriately sized SEM3 system CT. The meter modules are then snapped into place
into a rack assembly. The rack assembly has the module address to the controller hard
coded in the hardware.
Note: For metering of multi‐pole circuit breakers, the meter modules must be
mounted contiguously to each other.
Gaps in the rack will not allow multi‐pole meters to be configured. Each module must
have the phase dip 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).
Note: Once the meter module is placed into the rack and energized the phase position
will be indicated by a different color LED for each position. These descriptions are for
the connections to the controller not the LED colors on the meter module. (L1 phase
A color is orange; L2 color is yellow; L3 color is green.) The LEDs are adjacent to the
phase numbers. The Kwh pulse is available for an accuracy check as stipulated by
some authorities KT=10 (5 on ‐5 off). CT sizing for each meter module will be done
through the controller web page later in configuration.
Controller
– 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
Installation Manual instructions for mounting and dimensional information.
To start – Connect the controller to a PC using the Ethernet / Modbus TCP port.
See Figure 4.
Assign Static IP address
To change the PC / computer's IP address in Windows 7 / 8,
1. Type network and sharing into the Search box in the Start Menu and select
Network and Sharing Center when it comes up.
2. Then when the Network and Sharing Center opens, click on Change adapter
settings.
3. Right‐click on your local adapter and select Properties.
4. In the Local Area Connection Properties window highlight Internet Protocol
Version 4 (TCP/IPv4) then click the Properties button.
5. Select the radio button and enter the correct IP address Ex. 192.168.1.100,
and Subnet mask 255.255.0.0. The PC static IP address should be in the
same IP address range of the SEM3 controller.
6. Close out of the Local Area Connections Properties window.
7. You can open the command prompt and do an ipconfig to see the network
adapter settings have been successfully changed.
Ping your SEM3 Controller (Default IP address: 192.168.1.65)
Open a Command Prompt and at the prompt type "ping" followed by a space & the
IP Address of your SEM3 and press Enter.
You should get the following:
Pinging 192.168.1.65 with 32 bytes of data:
Reply from 192.168.1.65: bytes=32 time=56ms TTL=250
Reply from 192.168.1.65: bytes=32 time=60ms TTL=250
Reply from 192.168.1.65: bytes=32 time=69ms TTL=250
Reply from 192.168.1.65: bytes=32 time=78ms TTL=250
4
Figure 2 Current transformer
KWH pulse
LED indicates Phase position
switch location
Figure 3 Meter module
Three phase wiring
QR
code
Isolated
RS485C
Two energy
pulse in
Figure 4 Controller
(continued on next page)
Solid core shown, split core available
Blue mark indicates high
accuracy, and burgundy
mark indicates standard
accuracy
Release lever to
allow easy removal
from the rack
CT wire
terminal blocks
CT wire
screw terminals
Left rail
MODBUS TCP/IP
Right rail
Energy pulse out
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