Brochure

ESG

8.648.64

8.64

Testing the SSR

(Fig. 21) (Fig. 21)

(Fig. 21)

Many of the tests required to verify SSR performance are inherently hazardous and caution should be exercised,

using adequate safeguards for the personnel conducting such tests.

Possibly the simplest of all field tests that can be made to determine proper function of an AC SSR is by means of a 3

volt battery, a light bulb, and a piece of insulated wire. This simple go/no-go test is illustrated by Fig. 21.

A more complete performance check might include operating the SSR in position with its actual load, while exerci-

sing the system installation functionally through all of its specified environmental and power combinations.

When connecting test equipment directly to the power circuit of an SSR output, protective fusing would be a wise

precaution. Also remember that with some equipment such as an oscilloscope, the case must be "floated" (ungroun-

ded) and may be at line potential. In some test circuits an isolated current probe or an isolation transformer can be

used to avoid this hazard. The output functions of an SSR should not ever be checked by a multimeter in the ohms

mode, since the minimum voltages and bias currents necessary for proper SSR operation are not present, thus

producing errneous readings.

3 V Battery

SSR

under

test

–

Input

–

Output

Lamp (40 W)

240 Vac

–

Fig. 21: Simple go/no-go SSR test