| Causes for AA battery drain in AD-Series LOCKS | |
| Possible Cause | Fix/Corrective Action |
| 1) One of the four (or eight) AA batteries is installed with the polarity reversed and the reversed battery drains the other batteries. | a. Always make sure the polarity is correct on all AA batteries by measuring the voltage which should be 6.5 – 6.4 VDC for new AA batteries (4 pack) and 12 VDC for new AA batteries (8 Pack). Also a visual inspection of battery polarity markings can be performed. |
| 2) The installation sequence was not followed when installing the COM400 board on the AD400 series lock. | a. Always install the COM400 board first; before applying power with the AA batteries or on the DC Power Aux Terminals. The COM400 board must already be installed during power up for proper lock initialization. If the batteries or DC power were already applied to the AD400 unit, you must cycle power or press the S1 button to reboot the lock. |
| 3) The reader is loose and not seated properly on the escutcheon. | a. Make sure the reader is positioned correctly on the escutcheon plate and the screws securing the reader are tight. See the "Install Reader" step of the installation instructions. Proper installation of the reader is necessary and proper reader installation can cause battery drain in the lock. |
| 4) The reader is not making contact with the connector on the outside baseplate or pin contacts on the connector are bent and not making good contact. | a. Without a reader connected to the lock main board, the lock will draw 6.7 mA trying to communication to the missing reader. Within a short period of time the batteries on the lock will drain due to the constant high current draw. Also if the reader is not making contact with the connector, the reader will not read, beep or blink during this time. |
| b. See the "Install Reader" step of the installation instructions. Proper installation of the reader is necessary and proper reader installation can cause battery drain in the lock. | |
| 5) Battery wire plug is smashed under the cover and damaging the AA battery. | a. Make sure the plug is positioned up and away and not being pinched between the cover and the batteries. |
| 6) The battery wring is damaged or pinched causing the batteries to drain. | a. Locate the battery wires and inspect to be sure they are correct and not pinched. |
| 7) When installing a lock with the 8 battery pack option; always install the provided Mylar sheet between the battery pack and the escutcheon's metal base plate. | a. The Mylar sheet prevents battery cases from shorting to the escutcheon's metal base plate. See Installation instructions for the step regarding installation of the 8 Battery Pack. |
| 8) Ribbon cable coming from the outside base plate is pinched between the door and the lock or the ribbon cable is installed incorrectly. | a. The ribbon cable is sometimes pinched under the outside escutcheon plate against the door during installation. Free up the pinched wire to stop the unit from draining batteries. Also the ribbon cable must be installed to the main board with the red wire on the left side of the connector. Failure to connect the ribbon cable correctly could result in battery drain on the lock. |
| 9) The outside of the lock, reader included, has not been installed correctly and weather is affecting the lock. | a. Is the lock under an awning or protected by an overhang? The lock has been tested to withstand the weather elements but the unit must be installed properly ensuring all gasketing on the lock is correct, specifically the gasket around the reader. |
| b. If the lock is loose on the door water can get behind the reader and lock base. Again ensure lock was properly installed ensuring all gasketing material is sealing entry points on the lock. | |
| 10) Follow the proper procedure when changing the coin cell battery. | a. Remove/unplug the AA batteries or discoonect DC power from the Power AUX Terminals, removing power from the lock before you remove and replace a coin cell battery. This avoids damage and allows the proper power up sequence and initialization to occur. |
| 11) An AD-Series Lock with just a Keypad (KP) only and Credential firmware 2.9.2 through 2.10.2 will draw too much current, and does not go to low current sleep mode. |
ADFwPkg2.15.1.ffp was released on 1-11-2011 to remedy this issue, credential firmware version 2.12.0 and higher eliminates this issue. Install the newest FW found at Schlage Technical Support "schlage.com/support" - see 56635 |
| Low current measurements for an AD-Series lock are dependent of the READER type and the reader settings. Below are the expected lowest current levels (Sleep Current) per lock/reader type. The current will greatly increase (briefly) with any radio transmission, LED flash, beep, card, key press or lever/lock movement. | |
| Reader Type | Typical Measurement (Sleep*) low current |
| AD-Series with a MT/MTK reader | 70- 110 uA |
| AD-Series with a SM/SMK or PR/PRK | 70-100 uA |
| AD-Series with a MS/MSK/MG/MGK with Track 2 low power wake up ON. | 20-40 uA |
| AD-Series with MS/MSK/MG/MGK with Track 2 low power wake up OFF. | 260-300 uA |
| * Sleep current is the lowest power mode an AD-Series lock when the lock is inactive and waiting. Sleep current should not be measured until 30 seconds after power is applied. This 30 seconds is needed for the complete boot up and initialization of the AD-Series lock with power up. | |
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