Confirmation Light Wiring With Electromechanical Relay Interface - OPTICOM 764 Installation Manual

9.3.2 Confirmation Light Wiring with Electromechanical Relay Interface

This section describes confirmation light using customer supplied relays. The following is recommended
specifications for the electromechanical relay:
Use a 24 VDC relay with a coil impedance of approximately 1000 ohms. The maximum amount of current
that the phase selector output is designed for is 50 mA.
The relay should have a diode across the coil, Use a 1N4004 or equivalent diode.
The following relay manufactured by IDEC meets the above listed requirements:
•
Relay: RH1B-UD-DC24V
•
Socket: SH1B-05
•
This relay contains a diode, so the diode shown in Figure C-1 is not needed.
•
This relay is available from Newark Electronics and other electronics supply houses.
NOTE: For applications with frequent activations, it is recommended that a solid-state relay be used in
place of an electro-mechanical relay. A load switch would be another option.
•
Omron G3NA-205B-DC5-24
•
This relay is available from Digikey www.digikey.com, (p/n Z165-ND) and other electronics supply
houses.
WARNING
This procedure may expose you to AC
voltage and the risk of electric shock or
electrocution. Turn off the AC mains and
use accepted and recognized safety
precautions to avoid exposure to the risk of
electric shock or electrocution. Electric
shock may cause severe injury or death.
1. Locate and identify the input connections in the traffic control cabinet for each electromechanical relay
that switches power to the confirmation lights.
2. Place a diode (1N4004 or equivalent) across the input to each electromechanical relay to prevent
damage to the Phase Selector. See Figure 5-17.
3. Determine the appropriate length of wire required to connect the auxiliary interface panel to the
wiring points for the relays.
4. Wire gauges from 22 to 16 AWG may be used.
5. Strip 1/4-inch (6 mm) of insulation from both ends of the wire being used.
6. Insert one end of the wire into the desired terminal of the auxiliary interface panel and tighten the screw.
Connect wires to terminals A CFRM, B CFRM, C CFRM, and D CFRM. See Figure 5-17.
7. Route the wires through the traffic control cabinet to the electromechanical relays in the load bay.
8. Install spade lugs on the wires and insert one wire at a time into the correct terminal in the load bay and
tighten the screws.
Intersection Equipment Installation Instructions
36