What is an Elevator ARD System?
To improve the reliability of elevator operations and prevent passengers from being trapped due to external power outages, which could cause physical or psychological harm, the Elevator Automatic Rescue Device (ARD) was developed.
The elevator ARD is a backup emergency power system that works in addition to the elevator’s original control and variable frequency systems. It features simple installation and wiring, convenient debugging, and a high cost-performance ratio.
When a power grid failure occurs, the ARD will automatically activate within a preset time. It will slowly move the elevator cabin in the direction of the lighter load to the nearest floor, level the elevator, open the doors, and release the passengers.
What is an Elevator UPS?
An elevator UPS (Uninterruptible Power Supply) falls under the category of offline UPS systems. It is primarily composed of a charger, batteries, and an inverter. The elevator UPS uses three-phase power to supply power to the elevator while simultaneously charging its batteries. It is essentially a reliable power backup solution for elevators.
The design of an elevator UPS considers factors such as the duration of common power outages, the capacity of the lift motor, the type of elevator, and whether the elevator will operate in residential or commercial areas.
What Is The Difference Between ARD And UPS?
The ARD manages faults within the power supply system. It connects to circuit breakers on overhead lines where faults frequently occur. These faults, often caused by temporary short circuits from events like lightning, strong winds, or animals bridging the lines, can self-clear. The ARD restores normal operation by automatically reclosing the circuit.
A UPS ensures uninterrupted power during sudden outages, allowing equipment to continue operating without disruption.