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EM3555
Supported System Types
ZL0093-0A
11/2011
SUPPORTED SYSTEM TYPES
The meter has a number of different possible system wiring congurations (see
Wiring Diagrams). To congure the meter, set the System Type via the User
Interface or Modbus register 130. 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 congured 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.
Table 3 Supported system types
CTs Voltage Connections System Type Phase Loss Measurements Wiring Diagram
Number
of wires
Qty ID Qty ID Type Modbus
Register
130
User
Interface:
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