LiftMaster MEGA ARM / MEGA ARM TOWER MATDCBB Green Control Board V.6.4 or newe - Page 8

ACCESSORY AND RELAY CONNECTIONS These terminals will provide battery backed power to 24 Vdc devices and are located at the bottom of the electronic control board at J4 terminals 1 and 2. Terminal 1 is 24 Vdc (+) and number 2 is 0 Vdc (-). Peripheral CLASS 2 low voltage devices that require 24 Vdc power maybe connected here (500 ma. maximum). EXAMPLE: Vehicle detector, radio receiver. RELAY OUTPUT K1 - (OPTION) S1-6 off S1-8 off, relay will fire (latch) when gate is not closed. S1-6 on S1-8 off, relay will fire when arm is pushed up off of limit switch (use with slip clutch option) and fires relay when a tail-gate is detected by the close loop - ANTI TAIL-GATE ALARM. S1-6 off S1-8 on, relay will pulse relay when arm reaches full open position. S1-6 on S1-8 on, relay will only pulse when input is given to J5 1,2,3 inputs. (see page 10). BATTERY INSTALLATION HOOKING UP BATTERY LEADS - ALWAYS HOOKUP AND TURN ON AC POWER BEFORE INSTALLING BATTERIES. After turning on AC power, install two new, fully charged 12 volt DC batteries on shelf next to motor. Connect red lead from operator to the positive (RED +) terminal of one battery and black lead from the operator to the (BLACK -) terminal of the OTHER battery. Place the supplied jumper between the remaining terminals of each battery if one is not already in place (Figure 1). (Use LiftMaster MBAT or 29-NP712 for replacement batteries.) Replace in pairs. WARNING: Do not run operator without installing the batteries. FIGURE 1 Black Lead - 12 VDC Battery + - Jumper 12 VDC Battery + Red Lead Failure to install batteries correctly will cause damage and will not be covered by warranty. FIGURE 2 Master J5 1 2 3 4 5 6 7 8 9 10 11 12 MASTER/SECOND WIRING STEP 1: In a master/second configuration, either unit can be the master. Choose one unit to be the master and then direct all control wiring to it (also install vehicle detectors and receivers in it). STEP 2: At the MASTER, any input (at J5) with control (detectors, receivers, keypads, timers, etc.) wires to it must also be run to the same terminals of the second. Along with these control wires, both operators MUST share a common ground connection from chassis to chassis (or from common to common, i.e., master gate J5 terminal #12 to second gate J5 terminal #12). EXAMPLE: If only open and close are used at master then three wires will run between gates (Figure 2). STEP 3: If it is required that if one gate senses an obstruction, the other reverses also, then 3 additional wires must be run between the master J3 and second J3 (Figure 3). These connections are for transmitting IRD (obstruction signals) between both units. This will allow the master or second to inform the other that a closing obstruction has occurred and for it to reverse and open. SET switches on S2, 1-8 the same on both gates. Open Close Common 1 2 3 4 5 6 7 8 9 10 11 12 Second J5 RX GND TX 12 34 Master J3 Second J3 IRD - Obstruction Signal Connections Terminal 1 of Master must go to terminal 4 of Second and terminal 1 of Second must go to terminal 4 of Master. Terminal 2 of Master must go to terminal 2 of Second. 12 34 RX GND TX 8