Specifications

6 • Energy Meter 026-1726 Rev 0 22-MAR-2011
3.2. Supported System Types
The Energy Meter Series has a number of different possible system wiring configurations (see Section 4,
Wiring). To configure the meter, set the System Type via the User Interface or Modbus register 130 (if so
equipped). The System Type tells the meter which of its current and voltage inputs are valid, which are to be
ignored, and if neutral is connected. Setting the correct System Type prevents unwanted energy accumulation
on unused inputs, selects the formula to calculate the Theoretical Maximum System Power, and determines
which phase loss algorithm is to be used. The phase loss algorithm is configured as a percent of the Line-to-Line
System Voltage (except when in System Type 10) and also calculates the expected Line to Neutral voltages for
system types that have Neutral (12 & 40).
Values that are not valid in a particular System Type will display as “----” on the User Interface or as QNAN
in the Modbus registers.
CTs Voltage Connections System Type
Phase Loss
Measurements
Wiring
Diagram
Number
of wires
Qty ID Qty ID Type Modbus
Register
130
User Inter-
face:
SETUP>S
SYS
VLL VLN Balance Diagram
number
Single-Phase Wiring
2 1 A 2 A,N L-N 10 1L+1n AN 1
2 1 A 2 A,B L-L 11 2L AB 2
3 2 A,B 3 A,B,N L-L with N 12 2L+1n AB AN,BN AN-BN 3
Three-Phase Wiring
3 3 A,B,C 3 A,B,C Delta 31 3L AB, BC,
CA
AB-BC-CA 4
4 3 A,B,C 4 A,B,C,N Grounded
Wye
40 3L+1n AB, BC,
CA
AN, BN,
CN
AN-BN-CN
&
AB-BC-CA
5, 6
Table 3-1 - System Types