Watlow SDA Card Shorted Solid State Relay Detector Bedienungsanleitung PDF herunterladen

There is concern that if a solid state relay fails, it will

most likely fail in a shorted condition. To alleviate this

concern, Watlow Controls has designed a low-cost card

(Watlow P/N 08-5386) that provides a shorted SSR

alarm. It is designed to be used with DC input SSRs,

rated 10 to 40 Amps on either a single phase or two-leg,

three-phase system. In addition to the SDA card, we

strongly recommend semiconductor fuses to protect the

SSR, and a high limit cutout to protect the thermal

system from any runaway conditions.

The SDA card mounts directly on the solid state relay

and takes its power from the current flowing through the

current transformer. If there is no input command signal

from the temperature control to the SSR, and there is

current flow to the load, the alarm becomes energized.

The alarm circuit’s output is a triac rated for 300mA @

120 or 240V~ (ac). This can be wired through a

customer supplied latching relay and alarm to 120 or

240 volts.

Watlow Controls

1241 Bundy Blvd., P.O. Box 5580

Winona, MN 55987-5580

Phone: 507-454-5300, Fax: 507-452-4507

SDA Card

Shorted Solid State Relay Detector

Data Sheet

0600-0028-0004 Rev C (1278) Made in the U.S.A.

January, 1998 Printed on Recycled Paper

10% Postconsumer Waste

Figure 1 - SDA Card Dimensions (08-5386)

NOTE: Mount with two 6-32 screws 5/8”

long. (Included with the SDA card.)

1 2

There is concern that if a solid state relay fails, it willmost likely fail in a shorted condition. To alleviate thisconcern, Watlow Controls has des

To HeaterTB12 1(See below for wiring.)LoadLineFuseL1L2Load Number of Passes of Load WireCurrent Through Current Transformer2 to 3 Amps 53 to 4 Amps

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Watlow SDA Card Shorted Solid State Relay Detector Bedienungsanleitung