Interlocking - Alstom

VPI ® / VPI II HardwareInterlockingChassis Configurations> Plug Coupled ChassisThe VPI II plug coupled chassis includes internalcable harness assemblies. These assembliesconnect the VPI II PCB I/O point(s) to a series ofAMP type M-series plug couplers, mounted on therear panel of the chassis. The rear panel alsocontains a 14-pin type M-series plug coupler for the5 VDC power connection and provisions for up tofour 60-way ribbon cable connectors for connectingto expansion chassis.Plug Coupled Chassis> Direct Wire ChassisThe direct wire chassis is configured to allow the I/Owiring to be economical by directly inserting wire intothe PCB edge connectors in the chassis. This chassisconfiguration does not allow for quick removal of thechassis from a wired rack. However, all the PCBscan be removed and no active electronic componentsare left in the chassis. This version is intendedfor applications where the rack housing this chassisprovides a plugcoupled connection to the otherinterlocking equipment.Direct Wire ChassisCPIB Chassis> Control Point in a Box (CPIB) ChassisThe CPIB interface chassis uses Back PlaneInterface Cards (BPIC) with Cage-Clamp style(spring cage clamp) wire termination blocks andprinted circuit board edge connectors to map theI/O termination points on the VPI II PCBs to discretewire connectors. The chassis is designed to allowthese interface PCBs to be inserted and removedfrom the rear of the chassis. This provides a wiretermination method that can be quickly disconnected(by removing the printed circuit boards) andindividual I/O points may be disconnected fortroubleshooting. This chassis style is intendedfor low density applications.46CALL 800.717.4477 • FAX 585.274.8777