Watlow SDMA Card Shorted Solid State Relay Detector Manual de usuario descargar pdf

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

most likely fail in a shorted condition. To minimize this

concern, Watlow Controls has designed a low-cost card

(Watlow P/N 09-2313) 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 three-

phase, two-leg system. In addition to the SDMA 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 SDMA 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 through the heater, the mechanical relay

alarm output will de-energize. This can be wired through

a customer supplied latching relay and alarm to 120 or

240 volts. Output contact rating of the SDMA mechanical

relay is 0.5 amperes maximum.

Watlow Controls

1241 Bundy Blvd., P.O. Box 5580

Winona, MN 55987-5580

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

SDMA Card

Shorted Solid State Relay Detector

Data Sheet

0600-0028-0006 Rev A (1632) Made in the U.S.A.

January, 1999

Figure 1 - SDMA Card Dimensions

NOTE: Mount with two 6-32 screws 5/8”

long. (Included with the SDMA card.)

1 2

Indice de contenidos

Pagina 1 - SDMA Card

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

Pagina 2 - SDMA alarm outputs in series

Load Number of Passes of Load WireCurrent Through Current Transformer2 to 3 Amps 53 to 4 Amps 44 to 5 Amps 35 to 10 Amps 210 to 40 Amps 1S D M AHeater

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