3CTR is a complete control system for tunnel lifts. It is installed on equipment with three arms: the column holders for tunnels. The centrals are, in essence, composed of two baskets for lifting people and a central arm to lift and mount the ribs, which are used to arm the vault of the tunnel.
On each basket there are controls that allow operators to control the central arm of the centennial. Proportional manipulators control proportional solenoid valves, which make the movements of the lifting equipment very fluid and also accurate. To operate a movement, you must first press the consent button. This device serves, in fact, to avoid movements not wanted by the operators, which could compromise their safety.
The controls of the hinge arm are combined into only two manipulators. There are two separate buttons for opening and closing the vices that keep the rib locked. The buttons are separated from the rest of the controls to avoid errors on the part of the operators, which would cause the rib to be released during assembly.
In addition, the emergency buttons are an important safety to lock the whole machine in case of emergency situations.
The 3CTR tunnel lift control system is equipped with safety functions that prevent movement in hazardous conditions. The moment limiter and load limiter (controlled by a microprocessor) also help operators lift the ribs safely.
The stabilization controller ensures that the tunnel column laying is perfectly stabilized before starting the rib assembly session.
The control selector avoids incompatible simultaneous maneuvers, allowing operators to focus on the movements they are performing.
Control system for tunnel lifts 3CTR, the project
3CTR it is a complex project, composed of 16 different electronic boards, more than 40 integrated circuits and 550 discrete electronic components, which I made when I was 19 years old. The 3CTR tunnel lift control system controls over 40 solenoid valves (proportional and on/off). I took care of everything: the design of the wiring diagrams, the unraveling of the printed circuit boards, the realization of the prototypes, the firmware programming and also the programming of the configuration software that worked in the DOS environment.
All the handling and control functions are performed by logic integrated circuits, while for the moment and area limiter (safety devices) I used a microprocessor, completely programmed in Assembler. The moment limiter was also developed on a separate circuit (CTR LIM project), which exploited the same program, but on an independent board.
3CTR, electronic board list
Relay motherboard, 3CTR R
PCB slot, motherboard, 3CTR RDX
PCB slot, motherboard, 3CTR RSX
Power supply and filter, 3CTR ALIM
Mechanical Equipment Stabilization Controller, 3CTR STAB
Command transmitter selector, 3CTR SEL
Command decoder, 3CTR DEC
Rib Extender Controller, 3CTR ALL
Moment and area limiter, 3CTR LIM
Command transmitter, 3CTR TC
Control transmitters, 3CTR TX1 and 3CTR TX2
Safety Data Sheet for Lifting People, 3CTR EBK
Arm solenoid valve amplifier, 3CTR EBF
Processor for proportional solenoid valves, 3CTR CEST
Hour counter, 3CTR TM
Here, finally, a photo that refines a party with the "decorated" stoner.
Project start: October 1996. Current state: discontinued.