How Does an Elevator Password Keypad Control Access to a Lift?

A password keypad or card reader can provide a simple way to restrict access to an elevator or hydraulic lift.

The basic principle is to place the access-control relay in the elevator call-button circuit.

A typical four-wire keypad uses two wires for 12–24V DC power and two wires for a Normally Open relay output.

Without a valid password or authorized card, the relay remains open, so the call button cannot effectively communicate with the elevator controller.

After successful authentication, the relay closes and the call button becomes active.

The keypad does not directly control the elevator motor or hydraulic pump. It simply determines whether the user has permission to send a call signal to the elevator controller.

This method is useful for private home lifts, cargo lifts, warehouses, industrial facilities, parking lifts and other applications where unauthorized operation needs to be prevented.

The elevator controller and safety system continue to handle the actual movement and safety functions.

Read the complete technical explanation:

Elevator Password Keypad: How Access Control Works for Lifts

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