Maretron user manual Three-Phase Phase A, B, C Connection, ACM100 User’s Manual, Page, Revision

ACM100 User’s Manual

2.4.2.3 Three-Phase (Phase A, B, C) Connection

Please refer to Figure 5 for connecting the ACM100 to a three phase system.

Line (Phase C)

Fuse

Line (Phase B)

Current

Transducer

Current

Transducer

Source		Fuse					Current
							Transducer
	Line (Phase A)
AC	Fuse
	Neutral
	1	2	3	4	5	6	7	8	9	10 11 12
	ALine	BLine	CLine	ANeutral	BNeutral	CNeutral	A+	A-	B+	B- C+ C-
							I I I I I I
	V V V V V V

+	+
U.S.	Europe
120 Volts	220 Volts
60Hz	50Hz
-	-

ACM100 Screw Terminals

Figure 5 – Three-Phase Connection Diagram

Use the following instructions when you are connecting the ACM100 to a three-phase “Wye” circuit connected via three hot wires and a single neutral (NOTE: Three-phase delta connected circuits are not supported by the ACM100). You will need to install three current transformers and three user-supplied voltage sense cables. The ACM100 comes with a single current transformer so you will need to purchase two optional current sensors (Part # PCT-1000-101- 03) for monitoring this type of system.

Step 1: De-energize the AC Source.

Step 2: The Current Transformer has black and white wires. Install the first Current Transformer as follows:

a.Connect the black wire to pin 7 (IA+) on the ACM100

b.Connect the white wire to pin 8 (IA-) on the ACM100

c.Disconnect the Phase A hot wire from the AC power source and place it through the hole in the Current Sensor such that the arrow on the Current Sensor points towards the AC power source. Then, reattach the Phase A hot wire to the AC power source.

Step 3: Install the second Current Transformer as follows:

a.Connect the black wire to pin 9 (IB+) on the ACM100

b.Connect the white wire to pin 10 (IB-) on the ACM100

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