Schneider Electric EM3555 Supported System Types, Supported system types, Single-Phase Wiring

EM3555	ZL0093-0A
Supported System Types	11/2011

SUPPORTED SYSTEM TYPES

The meter has a number of different possible system wiring configurations (see Wiring Diagrams). To configure 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 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.

Table 3 Supported system types

	CTs		Voltage Connections			System Type		Phase Loss Measurements			Wiring Diagram
Number	Qty	ID	Qty	ID	Type	Modbus	User	VLL	VLN	Balance	Diagram number
of wires						Register	Interface:
						130	SETUP>
							S SYS

Single-Phase Wiring

2

2

3

1	A	2	A, N	L-N	10	1L + 1n		AN		1
1	A	2	A, B	L-L	11	2L	AB			2
2	A, B	3	A, B, N	L-L with N	12	2L + 1n	AB	AN, BN	AN-BN	3

Three-Phase Wiring

3

4

3	A, B,	3	A, B, C	Delta	31	3L	AB, BC,		AB-BC-CA	4
	C						CA
3	A, B,	4	A, B,	Grounded Wye	40	3L + 1n	AB, BC,	AN, BN,	AN-BN-CN &	5, 6
	C		C, N				CA	CN	AB-BC-CA

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