A relay selector is commonly used on high-speed high-rise traction elevators.

A relay selector is commonly used on high-speed high-rise traction elevators.

• A. True
• B. False
• C. Sometimes
• D. Not Applicable

Answer: (B)

In high-speed, high-rise traction elevators, the control system needs fast, precise, and flexible sequencing across many floors, along with robust fault handling and diagnostics. A relay selector is a hardware-based method that energizes one of many relays to drive circuits, which works but is rigid, bulky, and subject to wear. Modern elevator controls rely on microprocessor-based controllers with programmable logic and solid-state relays or contactors, often paired with variable-frequency drives, to deliver smooth starts and stops, accurate speed control, and quick fault responses. This setup is much better suited to the demands of tall buildings than a relay selector, which is why it isn’t commonly used in high-speed high-rise traction systems. In older or simpler installations, you might still encounter relay-based logic, but it’s not the standard for contemporary high-rise traction elevators.

In high-speed, high-rise traction elevators, the control system needs fast, precise, and flexible sequencing across many floors, along with robust fault handling and diagnostics. A relay selector is a hardware-based method that energizes one of many relays to drive circuits, which works but is rigid, bulky, and subject to wear. Modern elevator controls rely on microprocessor-based controllers with programmable logic and solid-state relays or contactors, often paired with variable-frequency drives, to deliver smooth starts and stops, accurate speed control, and quick fault responses. This setup is much better suited to the demands of tall buildings than a relay selector, which is why it isn’t commonly used in high-speed high-rise traction systems. In older or simpler installations, you might still encounter relay-based logic, but it’s not the standard for contemporary high-rise traction elevators.