Ensure Safety Of Lift And Escalators

Market trends show that there will be a high demand for elevators & escalators in the coming years, thanks to the very active construction market and trend to grow vertically with high rise buildings.

Safety is a critical aspect for any escalator or elevator manufacturer. Elevators driven by poly-phase AC motors must be prevented from starting when there is a phase reversal or phase failure condition present. The reversal of three phase voltage can lead to a sudden change in direction, which could lead to a disastrous hazard when the transportation of people is involved. A phase failure could lead to a sudden or uncontrolled stop, which is another possible hazardous condition.

Hydraulic elevators driven by poly-phase AC motors should be designed in a way to prevent overheating of the drive system by single phasing or low voltage conditions. These very common conditions will ultimately lead to motor failure and they are responsible for approximately 14% of all motor failures, while 30% are due to overloading. A motor failure is a more troubling situation, because in addition to an uncontrolled hazardous stop, it also brings with it costly downtime and repair. Therefore, it is imperative to monitor for the following critical situations: Phase reversal, Phase loss, Under-voltage.

Further, an Elevator control panel is a system to control the elevators, either manual or automatic. The controller usually tunes down the voltage between 12V to 24V to the controlling system, Only the motor needs 3-phase power supply. The low voltage power supply is for the controlling component and the fixtures to control the elevator. This is provided by a switched mode power supply.

Given the task considerations, GIC has designed three-phase monitoring relays in a compact DIN rail mount housing of just 17.5 mm wide, the relay is capable of monitoring all of the unhealthy voltage conditions and provide a relay output. Wide voltage monitoring range is available for over and under voltage protection. Visual indication provides a diagnostic alert of an alarm condition. A built-in time delay for the relay activation is available in order to prevent relay chattering around the set point for under-voltage monitoring. Upon activation, the relay can trip the motor for unhealthy condition, & turn on whenever system becomes healthy.

Quality raw materials are carefully chosen and used to ensure durability, high efficiency, long service life and low maintenance. Highly reliable and rugged designs our SMPS are featured with very low ripple & noise are suitable for continuous use. SMPS are designed, manufactured and tested to meet tough industrial standards for higher reliability and quality.