Troubleshooting

Control switch must be wired on DC side of power supply when an AC transformer and rectifier are used, the control switch must be wired between the rectifier and the EM Lock.

Through an installation error by removes power from the wires going to the EM Lock, the wires have their insulation abrasion between the switch and EM lock so that partial or full power can leak in from another lock or other DC device with similarly abrasion wiring. This could be occur at the point where the wire cable away from the EM lock and enters to the door frame.

A metal door frame or the metal conduit with abraded wires can cause of leaking power between multiple devices. A good way to check electricity is to use a meter and check the leakage between the power supply with the door frame and conduit. The EM locks should be powered by isolated DC voltage without any earth ground by refer to positive or negative. 

Remove diode.

Armature must pivot loosely from its center mounting point to permit full armature contact. 

Armature plate designed to move freely is to ensure that the maximum amount of surface area comes in contact with the surface of the EM Lock. If the armature is too stiff and cannot move freely, it may not contact properly with the EM Lock.

Remark: Although an Armature plate needs to be freely of movement when installed but it should not be loose.

Check the armature and EM Lock surface to see if there's small obstruction is interfering with a flat fit. Even a small air gap can reduce the holding force. 

EM Locks require stable DC input voltage. When AC voltage from a transformer is used, a full wave brigde rectifier must be installed to convert the AC voltage to DC voltage.

A suitable power supply should also have a means of adjusting the output voltage to allow the installer to ensure the connected devices are receiving appropriate voltage according to their specifications.

Check for proper voltage at the EM Lock input. If low, determine if the correct wire gaugeis being used to prevent excessive voltage drop.

Check for proper supply load capacity. It must meet or exceed the combined current rating of all locks on the circuits.

When improper cleaning (For e.g. steel wool) has ocurred, this will stripped off the relatively soft plating. Once the plating has been removed, it cannot be restored in the field, so the EM lock will have to be periodically cleaned and coated with oil or other rust inhibitor.

If the EM Lock was installed in a heavy corrosive atmosphere, such as near to the ocean, it will eventually rust even with non abrasive cleaning. Therefore, EM Lock should be continued on a regular basis to remove the rust. 

Remove the blue tape / plastic bag from Armature before use.

The surface of the EM Lock and the armature plate should be smooth and clean. The surfaces need to be plated and polished to ensure a good solid surface when contact each other. Double check both of the surfaces to make certain they can perform correctly.

Check the voltage at the EM Lock. If the voltage is low or zero, double check all the wire connections and the power supply.

Need to ensure the EM lock is being correctly powered with DC voltage.

Check the voltage polarity. Terminal (-) is: Negative. Terminal (+) is: Positive. Positive must go to red and negative to black.

If the EM Lock continues operate fail, electricity need to be checked with an Ammeter. It must be powered with the correct input voltage if it draws the specified current. 

Check coil continuity with OHM meter. If reading is high or open replace the magnet coil. 

Coil shorts or incorrect wiring will blow fuses. Measure the coil for correct resistance.