What is Modernization ? – A Detailed Explanation
Modernization is the replacement of components of an existing elevator with components that perform the same functions but with greater efficiency or accuracy.
For example, single speed AC elevator controllers are limited in their ability to stop an elevator level with the hoistway landing. Single speed elevator controllers rely upon the brake tension and activation of a stopping switch at a set distance from the landing for stopping level with the landing. Unfortunately, a change in the weight of the elevator car changes the momentum and thus the stopping accuracy. We would suggest the replacement of the single speed controller with a new variable voltage variable frequency control system. Variable voltage variable frequency control systems vary both the voltage and frequency of the voltage applied to the hoist motor in order to vary the speed with which that motor turns. Because of this, the hoist motor can be brought to an electrical stop – a state where the hoist motor is energized but not turning. Coupled with an infinite ability to vary the hoist motor speed, the floor stops can be set accurately regardless of the load in the car.
Some examples of modernization and the associated benefits are:
| Existing Component | Replaced with | Benefit |
|---|---|---|
| Single and two-speed elevator controllers | Variable Voltage, Variable Frequency Control | Dramatically improved leveling accuracy in traction elevators resulting in reduced exposure to “trip and fall” litigation. Also results in greater reliability and rider confidence. |
| Alternating current door operators | Variable Voltage Variable Frequency or DC Door Operator | Smoother operation with greater speed control resulting in more reliable reversal and reduced opportunity for a “door strike”. |
| Manifold style hydraulic control valves | Block Style or Unit Valve | Dramatically improved speed control and leveling accuracy in hydraulic elevators resulting in reduced exposure to “trip and fall” litigation. Also results in greater reliability and rider confidence. |
| Alternating current or “wet” brakes | Direct Current Brake | Improved leveling accuracy in single and two speed traction elevators. This is an option for customers who have older equipment and not the budget for a control system upgrade. |
| Mechanical Safety Edges | Infrared Curtain Unit | Eliminates the possibility of a door striking and injuring a passenger by eliminating the need for physical contact in order to reverse the door’s direction. |
| Car Operating Station | Car Operating Station with Emergency Light and ADA telephone | New models incorporate emergency lights, battery operated alarm bells and ADA compatible telephones resulting in greater safety. |
| Collapsible Scissor Gate | New Solid Car Doors | Eliminates the shear hazard created when the elevator moves vertically and an appendage or object is extended through the open spaces of the closed gate. |
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