LiftMaster LM21AFCB LM21AFCB Manual - Page 9

ADJUSTMENTS DIP SWITCH CONFIGURATION SETTING The release device has DIP switch selectable options. The options DIP switch is located next to terminal block 5. Set all DIP switch options before applying power to the system. The selection of positions is listed below. ON 1 2 3 4 5 6 7 8 Factory default setting of 10 seconds shown. DIP Switch 1 2 3 4 5 6 7 8 Switch "ON" Switch "OFF" Motorized door. The device will attempt to close the door with Manual door. The device will drop the door without attempting the motor before releasing. to close it with a motor. Stop on obstruction. If a motorized door is used, the device will attempt to close the door but will reverse if the safety edge is triggered. The device will stop the door on the obstruction when it is sensed the third time. Drop after sensing an obstruction three times. The device will attempt to close the door but will reverse if the safety edge is triggered. The device will fully open the door after a third obstruction is sensed and then drop the door. DIP switches 3 and 4 control the length of the delay, either 10, DIP switches 3 and 4 control the length of the delay, either 10, 20, 30 or 60 seconds depending on the switch settings. 20, 30 or 60 seconds depending on the switch settings. DIP switches 3 and 4 control the length of the delay, either 10, DIP switches 3 and 4 control the length of the delay, either 10, 20, 30 or 60 seconds depending on the switch settings. 20, 30 or 60 seconds depending on the switch settings. 6-Minute safety timer. Will drop the door after 6 minutes if the 3-Minute safety timer. Will drop the door after 3 minutes if the close limit is not achieved by a motorized closure. close limit is not achieved by a motorized closure Line Power Loss Alarm. Treat a loss of line power as an alarm, Operate normally from battery power when line power is lost. which leads to door closure or drop. (Standard) Auto-Open. Open a motorized door automatically after alarm Auto-Open Disabled. Keep door closed after alarm condition is condition is cleared by Remote Test / Reset Switch. cleared. (Standard) For voice board option only, this selects Message 1. For voice board option only, this selects Message 2. SELECTABLE DELAY SETTINGS (SWITCHES 3 & 4) The release device will provide a factory default delay of 10 seconds before releasing the fusible link chain upon alarm. The length of the delay is controlled by the positions (Off or On) of the number 3 and 4 switches on the 8-position DIP switch mounted on the logic board. Four preset delays are available and are shown. Delay Setting 10 Seconds 20 Seconds 30 Seconds 60 Seconds Switch Position 3 4 Off Off Off On On Off On On 9