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

12

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