GM Pontiac Overhead Doors System Design
Apr 29, 2021
15
| STATEMENT OF PROBLEM The (3) blank receiving overhead doors for this project were desired to closely mimick the blank receiving doors at LGR stamping plant addition. However, it was unknown what all of the control features were or how they interfaced. It was only known that buried loops and traffic lights were required. However CCC and IBI failed to integrate these controls (based on RFPS and Q&A answers) into the specifications and design. When the GM Design Project Manager transmitted to CCC photos of the OH doors at LGR, it was clear that the doors and control panels at pontiac were insufficient on the way they were designed to be operated. The CCC Engineering Manager made a trip to LGR to photograph the doors and all of the controls (loops, sensors, lights). The 3 doors are designed to be interlocked so that no door can operate if one or both of the other doors are open. Red/Green signal lights visually communicate door status. Underground loops control the metal sectional doors and sensors for fabric door. COURSE OF ACTION CCC brought on a new door supplier that was more intimate with GM spec and the sequence of operations desired. GM/CCC walked the field with the LGR photos to either copy the controls or change to suit the plant''''''''s needs. The Engineering Manager then created sketches for the controls and obtained GM approval in order to proceed with final design/install. The door control panels were replaced with new panels. LESSON LEARNED 1) When specific and complex door controls and interlock sequencing is required, a door supplier with GM project experience is preferred for designing the controls. 2) CCC must host an overhead door meeting either at the same time as the Door & Hardware Meeting, or at a later date, prior to submittal of the door controls. This meeting muist include GM GF, plant personnel, and process representative if required. 3) CCC and the EOR must better incorporate the RFPS and Q&A into the design, and reference in submittal review. 4) where specific control/interlock sequences are required for a typical design setup like a blank receiving bay, incorporate the design into the spec. |
