Schneider Electric 4000 manual Wire Pulse Initiator, Application

63230-300-212	Chapter 5—Input/Output Capabilities
April 2001	Solid-State KYZ Pulse Output
2-Wire Pulse Initiator	Most digital inputs in energy management systems use only two of the three
	wires provided with a KYZ pulse initiator. This is called a 2-wire pulse initiator
	application. Figure 5–3shows a pulse train from a 2-wire pulse initiator
	application.

In a 2-wire application, the pulse train looks like the alternating open and closed states of a Form-A contact. Most 2-wire pulse initiator applications use a Form-C contact, but tie into only one side of the Form-C contact where the pulse is the transition from OFF to ON of that side of the Form-C relay. In Figure 5–3,the transitions are marked as 1 and 2. Each transition represents the time when the relay transitions from KZ to KY. Each time the relay transitions, the receiver counts a pulse. The circuit monitor can deliver up to 25 pulses per second in a 2-wire application.

Y

K

Z

1 D2 3

KY

	KZ
		T
	Figure 5–3: Two-wire pulse train
3-Wire Pulse Initiator	Some applications require the use of all three wires provided with the KYZ
	pulse initiator. This is called a 3-wire pulse initiator application. Figure 5–4
	shows a pulse train for a 3-wire pulse initiator application.
	Three-wire KYZ pulses are the transitions between KY and KZ. These
	transitions are the alternate contact closures of a Form-C contact. In Figure
	5–4,the transitions are marked as 1, 2, 3, and 4. The receiver counts a pulse
	at each transition. That is, each time the Form-C contact changes state from
	KY to KZ, or from KZ to KY, the receiver counts a pulse.The circuit monitor
	can deliver up to 50 pulses per second in a 3-wire application.

Y

K

Z

1 2 D3 4 5 6

KY

KZ

T

Figure 5–4: Three-wire pulse train

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