Download Relay Board - Heathcote Electronics

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".
B5 A5 C5 S
S C3 A3 B3 C4 B4 A4
C6
B6
A6
A7
+
B7
0V
C7
B8 A8 C8 S
S C1 A1 B1 C2 B2 A2
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
B5 A5 C5 S
S C3 A3 B3 C4 B4 A4
C6
B6
A6
POWER
A7
+
B7
SUPPLY
0V
C7
B8
A8 C8 S
S C1 A1 B1 C2 B2 A2
SWITCH
Closing the switch will switch off the relay with contacts C1 A1 B1 and C2 B2 A2.
OPERATING WITH AN IRDOT-1 ETC
6
IRDOT-1
2
1
B5 A5 C5 S
S C3 A3 B3 C4 B4 A4
C6
B6
A6
POWER
A7
B7
+
0V
SUPPLY
C7
B8
A8 C8 S
S C1 A1 B1 C2 B2 A2
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
TEL/FAX 01538 756800 email [email protected]
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