INSTRUCTIONS FOR THE RELAY BOARD
The relay board has 4 double pole relays and a power supply. This allows the board to be powered by a voltage from 12 to 16 volts of either AC or DC. Power supply connections are made to terminals "+" and "0V". All the relay contacts are accessible for wiring from screw terminals. Four LEDs are fitted to the board. Each LED lights when its associated relay is energised. The relays are rated for switching a current of up to 3 amps. To simplify operating the relays from our other units the relays are energised when there is no connection to terminal "S". When terminal "S" is connected to 0 volts. (0 volts is the voltage at terminal "0V") the relays are no longer energised. The terminals are arranged so that "C" is common "A" is normally closed and "B" is normally open. The number after the letter refers to the pole of the relay. The first relay has poles "1" and "2", the second "3" and "4", the third "5" and "6" and the fourth "7" and "8". If the top right "S" is connected to 0 volts the relay contacts will connect "C3" to "A3"; and "C4" to "A4". Disconnecting 0 volts would connect "C3" to "B3" and "C4" to "B4".
The diagram above illustrates the internal relay contacts. The two poles are each electrically separate and can be considered as switch contacts operated electrically by "S" instead of by a manual lever.
OPERATING WITH A SWITCH OR RELAY
Closing the switch will switch off the relay with contacts C1 A1 B1 and C2 B2 A2.
OPERATING WITH AN IRDOT-1 ETC
The diagram shows an IRDOT 1 connected to switch the relay connected to terminals C3 A3 B3 C4 A4 B4. Note both the IRDOT and relay board must use the same power supply and have "0V" connected to "6".
There is a mistake in the relay board numbering in catalogue/manual 6. These instructions have the correct numbering.
HEATHCOTE ELECTRONICS, 1 HAYDOCK CLOSE, CHEADLE, STAFFS, ST10 1UE
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