LiftMaster SL575 SL575 Manual - Page 13

ADJUSTMENT LIMIT SWITCH ADJUSTMENT NOTE: Make sure the limit nuts are positioned between the limit switch actuators before proceeding with adjustments. 1. Remove control panel cover and locate the limit switch assembly. 2. Disengage the unit's manual disconnect (see page 12), then manually open the gate to its full open position (note direction of limit nut travel). 3. Adjust the open limit nut by depressing the retaining bracket to allow nut to spin freely. Adjust open limit nut so that it trips the open limit switch. After adjustment, release plate and ensure it seats fully in slots of both nuts. 4. Manually close the gate to its full closed position. 5. Disengage the retaining bracket and rotate the close limit nut until it trips the close limit switch. 6. Re-engage the retaining bracket into both limit nuts and also re-engage the manual disconnect. LIMIT DIRECTION DIRECTION OF GATE TO OPEN RIGHT (Factory Default) LEFT OPEN LIMIT A B CLOSE LIMIT B A Limit Switch Limit Nut A WARNING To reduce the risk of SEVERE INJURY or DEATH: CAUTION • Disconnect power BEFORE performing ANY adjustments. RPM SENSOR (HALL EFFECT) ADJUSTMENT NOTE: Normally the RPM Sensor (hall effect) does not need adjustment, but may go out of alignment due to shipping vibration or rough handling. AVERT These operators use an internal entrapment protector system. This system consists of the control board, magnet, and RPM sensor (hall effect). It may become necessary to adjust the sensor for correct alignment. To do so please perform the following steps: AVERT 1. The sensor must be centered over the magnet wheel. Adjust with horizontal screws. 2. The sensor must be level. 3. The sensor air gap should be adjusted to .010 - .015 of an inch. (The thickness of a business card may be used to gauge the correct distance.) Adjust with vertical screws. Vertical Adjustment Screws Horizontal Adjustment Screws RPM Sensor (Hall Effect) .010 - .015" (.25 - .38 mm) Air Gap Magnet ATTEN AVER Limit Switch Limit Nut B Retaining Bracket Depressed Plate ADVERTENCIA Each notch of the nut indicates an estimated 1" (2.5 cm) of gate travel GATE SYSTEM TEST PROCEDURES PRECAUCIÓN Make sure that the gate's path is clear from any obstructions and that all associated gate hardware is properly mounted and secured. 1. With the power off, manually move the gate to the fully closed position. 2. At the closed position, turn the power on and observe the control board's diagnostic and limit LEDs. When power is turned on, these LEDs should flash simultaneously for a few seconds. 3. Locate the 3-button control that is built into the electrical box. 4. Push the open button and observe the operator's behavior. The gate should begin opening. If the operator fails to open or has difficulty opening, refer to the troubleshooting section. 5. Once at the open limit, the gate will stop. Push the close button and observe the operator's behavior. If the operator fails to close or has difficulty closing, refer to the troubleshooting section. 6. While the gate is closing, push the stop button. The gate should now stop. 7. Push the close button to return the gate to the fully closed position. 13