LiftMaster LA500UL Installation Manual - Page 20

Step 8 Power Wiring

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INSTALLATION Step 8 Power Wiring The standard control box can be wired for either 120 Vac or 240 Vac. Factory default is 120 Vac. The Large Metal Control Box (XLM) can be wired for 120 Vac (default). The batteries are charged in the circuit by the toroid transformer, plug-in transformer, or the solar panels. Main power supply and control wiring MUST be run in separate conduits. SOLAR APPLICATIONS: For solar applications refer to Solar Panels section in the Appendix. Follow the directions according to your application. NOTE: If using an external receiver use shielded wire for the connections and mount the receiver away from the operator to avoid interference from the operator. OPERATOR POWER SOURCE 120 VAC Wire Gauge 14 350 feet (107 m) Wire Gauge 12 525 feet (160 m) Wire Gauge 10 850 feet (259 m) OR 240 VAC Wire Gauge 14 1,150 feet (351 m) Wire Gauge 12 1,850 feet (564 m) Wire Gauge 10 2,950 feet (899 m) NOTE: Use copper conductors ONLY. Standard Control Box 1. Turn off the AC power from the main power source circuit breaker. 2. Run the AC power wires to the control box. 3. Remove the toroid assembly from the control box by loosening the four screws and lifting the assembly up and out. 4. Ensure the 120/240 plug is connected to either the 120 or 240 Vac connector on the EMI board depending on your application. Factory default is 120 Vac. 5. Connect the ground wire to the ground screw on the back of the toroid assembly. 6. Connect the white wire from the toroid assembly to NEUTRAL using a wire nut. 7. Connect the black wire from the toroid assembly to HOT using a wire nut. 8. Replace the toroid assembly and tighten the four screws. Ensure the wires are not pinched. 9. Plug the J15 plug into the control board. The control board will power up. NOTE: You may see a small spark when plugging the J15 plug into the board. 10. Turn ON AC power to the operator. 20

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Step 8 Power Wiring
The standard control box can be wired for either 120 Vac or 240 Vac.
Factory default is 120 Vac. The Large Metal Control Box (XLM) can be
wired for 120 Vac (default). The batteries are charged in the circuit by
the toroid transformer, plug-in transformer, or the solar panels. Main
power supply and control wiring MUST be run in separate conduits.
SOLAR APPLICATIONS:
For solar applications refer to
Solar Panels
section in the Appendix. Follow the directions according to your
application.
NOTE:
If using an external receiver use shielded wire for the connections
and mount the receiver away from the operator to avoid interference from
the operator.
OPERATOR POWER SOURCE
120 VAC
Wire Gauge 14
350 feet (107 m)
Wire Gauge 12
525 feet (160 m)
Wire Gauge 10
850 feet (259 m)
OR
240 VAC
Wire Gauge 14
1,150 feet (351 m)
Wire Gauge 12
1,850 feet (564 m)
Wire Gauge 10
2,950 feet (899 m)
NOTE:
Use copper conductors ONLY.
Standard Control Box
1.
Turn off the AC power from the main power source circuit breaker.
2.
Run the AC power wires to the control box.
3.
Remove the toroid assembly from the control box by loosening the
four screws and lifting the assembly up and out.
4.
Ensure the 120/240 plug is connected to either the 120 or 240 Vac
connector on the EMI board depending on your application. Factory
default is 120 Vac.
5.
Connect the ground wire to the ground screw on the back of the
toroid assembly.
6.
Connect the white wire from the toroid assembly to NEUTRAL using
a wire nut.
7.
Connect the black wire from the toroid assembly to HOT using a wire
nut.
8.
Replace the toroid assembly and tighten the four screws. Ensure the
wires are not pinched.
9.
Plug the J15 plug into the control board. The control board will
power up.
NOTE:
You may see a small spark when plugging the J15
plug into the board.
10.
Turn ON AC power to the operator.
INSTALLATION