When FC-8840A Controls Four Doors, What are the Power Supply Requirements?
2016-11-08 16:45
Details of the problem:

When the FC-8840A four doors access control board controls four doors (including electric locks), can a 3.5A power supply ensure the normal use of the system?

Expert answer:

Hello, the working current of a FC-8840A four doors access control board is about 200MA~350MA, the workflow of 8 standard access control card readers is around 120*8=960MA, and the working current of 4 electric locks is  120MA~600MA/handle, if calculated by 4, the working current is about 2.4A, if all added up, all currents are estimated to be around 3.5A, and the maximum output of the power supply you mentioned is only 3.5A, so the power supply is not enough, According to the specification design power supply should provide 30~50% surplus current power supply to plan the system power.

It is recommended to choose a 5A power supply, or choose a 3.5A switching power supply to provide power to the motherboard and card reader, the electric lock is additionally equipped with a power supply to supply power. At present, due to the limited size of the box, we recommend using a dedicated 3.5A power supply to supply the current of the motherboard and card reader, and then equip an additional power supply to power the lock.

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