16.4      Electrical Controls

Conform to the following standards of electrical components for BHS/CBIS for MDOT MAA projects:

A.     Remote access to the BHS control system head-end shall be provided through a Virtual Private Network (VPN) connection.

B.     E-Stops shall be incorporated into the design at a minimum of every 25’ along each conveyor line.

C.      High resolution, shaft mounted tachometers/encoders shall be provided in tracking zones.

D.     Baggage Measurement Array (BMA) technology with a history of at least 5 years proven successful operation in conveyor systems shall be provided.

E.      Stack light colors within Screening area.

1.      Stand-Alone and Mini-Inline Systems (As defined by the PGDS):

Green                                  Cleared Bag

Red                                      Alarmed Bag

Amber                                 Unknown Bag

White                                  EDS/BHS Communications Error

2.      Medium Speed and High Speed Inline Systems (As defined by the PGDS):

Green                                  Normal Run

White                                  EDS/BHS Communications Error

Amber                                 BHS Fault

Red                                      Start Up

Blue                                     Failsafe

All screening area stack lights shall be equipped with audible alarms.

F.      Photoelectric sensors shall be retro-reflective type with polarized lenses.

G.     When integrating L3-Examiner 6000’s with the BHS, require one MVI card for each EDS device. [Note - other EDS, and later generations of L3 equipment may not require the MVI communications cards.]

H.     When a new section of BHS (or CBIS) is being integrated into an existing system, replace the existing PLC with a new control unit to control the entire system. In other words, do not attempt to integrate the new PLC with the existing.

I.       Meet or exceed the EDS manufacturer’s electrical requirements.

J.       One Operator Interface Terminal (OIT)/Human Machine Interface (HMI) shall be provided per Motor Control Panel, to display subsystem diagnostic, maintenance, and control information.

K.      Each conveyor motor shall have one heavy duty, 480V, 3 Phase, NEMA 1 disconnect switch and an auxiliary contact to report status of disconnect to PLC for system monitoring.

L.      Each Automatic Tag Reader (ATR) shall be a minimum of ten head array and a history of 5 years of proven successful operations in conveyor systems.

M.    BHS Contractor shall provide software and hardware consistent with industry standards such as:

1.      Windows based software platform;

2.      Operating system and Graphic User Interface (GUI) shall be user friendly and capable of simultaneously handling multiple programs while incorporating Object Linking and Embedding (OLE); and,

3.      Shall not be Proprietary, or ‘Sole Source’ hardware or software.

N.     PLC System and Centralized Supervisory computers shall be fully redundant to meet the specific functional requirements of the BHS for maintenance information. The controls system shall constantly update the BHS control room’s Graphic User Interface(s).