Sonifex SignalLED Series, Handbook, Page: 15 / 28

5
Installation 2
Please note pins 3 (0V) and 1 (input 1) are linked by default so that the sign
will illuminate in its default mode when first powered up.
Use a small flat blade screwdriver to undo the connection block screw
terminals. Do not fully remove the screws from the terminals - they only
need 2 or 3 full turns to accept the wire ends.
Step 1: Connect the power supply 0V lead to Pin 3 (Ground/0V), along with
the link, on the connector block.
Step 2: Connect the power 6V lead (normally marked by a white
stripe, or white text on the wire - test this with a voltmeter if you are
unsure) into pin 2 on the connector block. Configured like this, the sign will
illuminate when powered.
Step 3: If using Signalling input 1 to control the sign, remove the link
completely and connect a switch or other contact closure between Pins 1 &
3 (0V) of the connector block. If using Signalling input 2 to control the sign,
remove the link completely and connect a switch or other contact closure
between Pins 4 & 3 (0V) of the connector block.
When the power and signalling connections have been made, close the
access door by pressing the clip back to its original position. It will click into
place when it is fully home.
After all of the terminations have been checked and the cables have been
routed through the cable clamps, close the end cover by reversing the
opening procedure, taking care not to overtighten the retaining screw.
7V-36V Extended DC Voltage Option
The LD-DC option, or LDD version, of a sign allows a SignalLED main circuit
board to accept a DC input in the range 7V-36V, for example, if you have a
12V or 24V distributed DC power network.
It has the same signal and power pins as the standard sign where Pin 3 = 0V
and Pin 2 = +Volts.
Where a longer cable run is required or the cable itself has a relatively
high resistance, (CAT5 network cable for example), the DC/DC PCB may
be preferable. In such cases the higher voltage will reduce the amount of
current required by the sign. For example, the LED sign draws 500mA at 6V,
giving a total power of VA = 6 x 0.5 (3VA). Therefore, for 24V, the current
required would be 3VA /24V = 0.125Amps.