Causes and Solutions for Electromagnetic Lock Failure: No Activation, Burnt Smell, and Abnormally High Resistance
Date:05-03-2025
When the electromagnetic lock fails to activate after power is connected, emits a burnt smell, and shows an abnormally high resistance value across CN2, the following factors may be responsible:
-
Coil Burnout: The coil of the electromagnetic lock is a crucial component. Long-term overloading, short-circuits, or abnormal power supply voltages can cause the coil to overheat and burn out. Once the coil burns out, its resistance value increases significantly, and a burnt smell is produced, rendering the electromagnetic lock inoperable.
-
Internal Circuit Open-circuit: The internal connecting wires of the electromagnetic lock may break due to aging, external pulling forces, or manufacturing defects. This prevents the normal flow of electric current, causing the electromagnetic lock to remain inactive. Arcing may occur at the break point, resulting in a burnt smell and an abnormally high measured resistance value.
-
CN2 Interface Failure: The CN2 interface may suffer from poor contact, oxidation, or damage. Poor contact increases resistance, leading to heat generation and a burnt smell, and also prevents the electromagnetic lock from receiving power signals properly, thus failing to activate. If the interface is damaged, it may disconnect the internal circuit, causing an abnormal resistance value.
Solutions:
-
Power Supply Check: Use a multimeter to measure the voltage and current of the input power supply to ensure they meet the rated operating requirements of the electromagnetic lock. If the power supply voltage is too high or too low, adjust the power output or check the power supply equipment for faults, and carry out corresponding repairs or replacements.
-
Electromagnetic Lock Replacement: If it is confirmed that the coil of the electromagnetic lock is burnt out or the internal circuit is open-circuited and cannot be repaired, a new electromagnetic lock usually needs to be replaced. Select a product with the same model as the original electromagnetic lock or a compatible one to ensure its normal operation.
-
CN2 Interface Inspection and Repair: Carefully inspect the CN2 interface for signs of looseness, oxidation, or damage. If it is loose, re-insert it and ensure a secure connection. In case of oxidation, gently sand the interface surface to remove the oxide layer for good contact. If the interface is damaged, a new interface needs to be replaced. After dealing with the interface problem, measure the resistance value again to check if it returns to normal.
Touch-Sensing Electronic Lock
Advantages of our touch-sensing lock
custom locks
English
Español
Русский язык
Français
Vietnamese
بالعربية
Facebook
Youtube
Linkedin
Twitter
Instagram
Pinterest