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5.4 Relay Outputs
The Relay Card has six SPDT relays, each of which is rated to handle up to 250 V AC,
1200 V·A (max. 10 A) or up to 30 V DC, 240 W (max. 8 A) . Each relay draws approximately
83 mA from the +5 V power supply when energized. This current draw can be reduced by
approximately a factor of two by using the rn_RelayPwr() function call to engage the
power-save mode once a relay is energized.
Figure 39 illustrates one of the six relay output circuits. An LED is associated with each
relay, and is on while the relay is energized.
+5 V
1
2
3
1 k W
5
2
1
3
4
COM
NO
NC
100 nF
100 nF
47 W
47 W
Figure 39. Relay Output Circuit
CAUTION: Voltages up to 250 V AC may be present on the screw-terminal headers.
Exercise appropriate care when handling a wired Relay Card.
Since a wired Relay Card is likely to be installed as part of an assembly inside an
enclosure, Rabbit Semiconductor recommends that appropriate warning labels be
placed on the enclosure to alert the end-user of the high-voltage hazard and to refer
any repairs or maintenance to a qualified service technician.
Each relay has built-in snubbers, which consist of a resistor and a capacitor in parallel with
the contacts to reduce arcing. Although the original role of the snubbers was to preserve
the life of the relay contacts by reducing arcing, snubbers are particularly beneficial in cir-
cuits driving inductive loads, where they limit voltage transients and reduce electromag-
netic interference.
Depending on the reactive load you plan to operate with the Relay Card, you may want to
change the resistor and capacitor values used for the built-in snubber circuit. This can be
done easily since all the resistors and capacitors used in the snubber circuits are through-
hole parts.
User ’s Manual
109
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