Control system and method for roll-up door
US6082433A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 1997 |
| Grant date | Jul 4, 2000 |
| Priority date | — |
| Expiry date | Nov 21, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06B9/68
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A flexible curtain rollup door is driven between open and closed positions by an adjustable frequency AC electric drive motor including a controller which is operable to accelerate and decelerate the motor by supplying AC electrical power at variable frequencies over a predetermined time period and for operating the motor at selected speeds during a continuous run phase of operation. A programmable logic controller (PLC) is operably connected to the controller for the drive motor and is operable to receive signals from upper and lower door position sensors, door bottom edge bar breakout sensors, a door bottom edge bar contact sensor, area sensors on one or both sides of the door for detecting the presence of an object within certain areas adjacent the door opening and manually operable switches to control opening and closing movements of the door. A position sensor is connected to the motor and generates signals correlated with motor and curtain roll drum revolutions to provide backup door position signals. An operating setup procedure includes teaching the PLC signals corresponding to the open and closed positions of the door to provide backup motor shutoff signals in the event th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.