a/d/s/ iSeries manual Snubber Circuits Wiring Hookup

This device has snubber circuits designed to protect the contacts of the mechanical relays when it switches to inductive loads (i.e. solenoids, relays). These snubbers are internally connected between the Common (C) and Normally Open (NO) relay contacts of Output 1 and Output 2.

If you have an inductive load connected between Common (C) and Normally Closed (NC) contacts of the mechanical relays and you want to

protect them from the rush current during the switching period, you have to connect an external snubber circuit between Common (C) and Normally Closed (NC) contacts as indicated in the figure below.

2	C
OUTPUT
	NC
	NO
1	C
OUTPUT
	NC
	NO

100 0.033 1/4 W

275 V

RC CIRCUIT

OR

VARISTOR

Figure 2.10 Snubber Circuits Wiring Hookup

dc CONTROLLED SSR USED WITH TEMPERATURE CONTROLLER WITH dc VOLTAGE SSR DRIVER OUTPUT

Vac

TEMPERATURE CONTROLLER

CONTROL	dc INPUT		LOAD
		SSR
SIDE	4	1	SIDE	HEATER
				Vac
	3	2
0 or 5 Vdc,

TYPICALLY	FAST BLOW
	FUSE

ac CONTROLLED SSR USED WITH TEMPERATURE CONTROLLER WITH MECHANICAL RELAY OUTPUT

Vac

TEMPERATURE CONTROLLER

CONTROL	ac INPUT		LOAD
		SSR
SIDE			SIDE	HEATER
	4	1
				Vac
	3	2
				FAST BLOW

Vac	FUSE
DRIVING
SSR

ac CONTROLLED SSR USED WITH TEMPERATURE CONTROLLER WITH TRIAC OUTPUT

	TEMPERATURE		CONTROL SIDE	ac INPUT
			LOAD			LOAD
		CONTROLLER
					SSR
			RESISTOR			SIDE	HEATER
				4	1
Vac							Vac

3 2

FAST BLOW

VacFUSE

DRIVING

SSR

Figure 2.11 Typical Applications

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