Installation Notes: Model 24X/250 - GE Security 240 Installation Manual

Installation Notes: Model 24x/250

All numbered items below are referenced on the appropriate wiring diagrams
that follow:
1. Fuse, power supply, door strike, protection device, and relay are provided by
the installer.
The included 470 Ω ½-watt pull-up resistor must be installed at the
2.
microcontroller's terminal block. The Micro PX-2000 and 8RP boards do not
require this resistor.
3. Shielded cable is recommended in electrically noisy environments. If using
shielded cable:
• At the Reader end: connect all shields together and insulate them.
• At the Micro end: connect the shield to the Micro cabinet as
indicated in the appropriate Micro Installation Manual.
4. If using a local power supply, do not connect the power line from the
microcontroller to the reader. The ground line of the power supply must be
connected to the micro (pin 2 on the reader connector).
5. Blocking diodes may be 1N4148 or equivalent (installer supplied) and located
in a secure area.
Install two 1k Ω ¼-watt high-quality resistors at Door DI and Exit DI, as
6.
shown.
7. Connect a protection device across the door strike. Protection diodes may be
1N4002, 1N4003, or 1N4004 (installer supplied) for the door strike assembly.
• AC Door Strikes: Connect an MOV (metal oxide varistor) across the
door strike.
• DC Door Strikes: Connect a diode across the door strike (cathode to
positive side of door strike)
8. Relay Coil Current Restriction (Micro/5 2RP with external relay).
The relay coil current must be limited to 40 mA to prevent damage to the
board. Verify that the relay coil requires less than 40 mA.
12 VDC relay: coil resistance must be greater than 300 Ω.
The Micro/5 2RP with internal or AUX DO relay current through the relay
contacts must be limited to less than 2 A to prevent damage to the 2RP.
Current limiting may be achieved by using either a current-limiting power
supply or by wiring in an external fuse.
9. J3 is typically not used in this installation. See Figure 12, "GE Model 24x/250
Reader to Micro/Reader Junction Box (Manufactured prior to February 15,
2004) and Microcontroller," on page 18.
General note: Pair wires as shown in all wiring diagrams.
12 GE Contactless Reader Model 24x/250