Campbell-scientific A21REL-12 Relay Driver Manuel d'utilisateur télécharger pdf (Page 3)

A21 REL-12 RELAY DRIVER

FUNCTION:

Provide drive capability for four external relays

controlled by the CR10, 21X, or CR7

dataloggers. The A21 REL-12 is powered by a

12 V source on the relay coil.

CONTACT RATING:

DC - 1 Amp at 20 V

AC - 0.3 Amp at 120 V

COIL CURRENT:

13 mA/relay

CONNECTIONS:

+12 V External 12 V source

Ground Low side of external source

REL COM Low side of device under control

REL NC Normally closed relay output to

device under control

CTRL To datalogger control port. When

presented with 5 V, REL NC and

REL NO invert their normal states

until CTRL goes to 0V at which time

REL NC and REL NO return to

normal states.

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Campbell-scientific A21REL-12 Relay Driver Manuel d'utilisateur Page 3