PAT/HIRSCHMANN/WIKA # 024-350-060-708 – DS350GW Central Unit

Manitowoc # 9333101954

All the data of the crane are stored inside the central unit in E-Proms. The central unit gets all actual information of the crane. This is computed against the reference data and the crane status continually monitored.

Description of the Housing: The central unit DS350 has a rugged, waterproof sheet steel housing. It is mounted on the left side of the turntable weldment or on the counterweight. The cables are led into the central unit via strain reliefs and connected with fast-ons. On the housing is mounted an override connected with fast-ons. On the housing is mounted an override switch to override the LMI function. The system is protected by a 2 AMP fuse which is mounted on the lower right side. The output signal is protected by a 10 AMP fuse, which is mounted on the lower mid.

Description of the Boards: Inside the central unit there is one board. The main board and the terminal board are two separate boards connected by a pair of ribbon cables. Power and are also connected from the terminal board to the main board. The wires from the various components are connected with fast-ons to the terminal board. The main board is the heart of the system. It contains the main computer and the necessary electronics to receive, evaluate, process and direct the continuous data. There are overload and anti-two-block relays mounted on this board that control the lever lockout(s). A power supply prepares all the necessary voltages for the transducers and the electronics on the main board. An analogue input part, which receives and prepares all the signals from the transducers for further processing. An analogue/digital converter converts all the processed analogue signals into digital ones. A digital circuit contains the main computer and the ancillary electronics.

Incoming Signals: The signals from the transducers are connected to the terminal board. The signals of the angle-length transducer are connected to terminal #9 (angle) and terminal #10 (length). The signal on terminal #9 (angle) is between -1.875V (90°) and -3.125V (0°). The signal on terminal #10 (length) is between -0.500V retracted M/B and -4.500V. The signals from the pressure transducers are connected to terminal #16 (rod side) and terminal #21 (piston side). The signals on terminals #16 and #21 are between 0.00V @ 0PSI and -1.00V @ max PSI. The signal from the force transducer is connected to the terminals #28 and #29. The signal between #29 (negative output) and #28 (positive output) is between 0.00V @ 0 force and +2.500V @ max force. The inputs for the duty selection switches are the terminals #38, 40, 42 for positive signals, or #37, 39, 41 for negative signals. The input for the anti-two-block switch is terminal #35.

Outgoing Signal: The outgoing signal of the terminal board is the signal for lever lockout of terminal #48. In normal working conditions there are 12 volts at this terminal. If there is an overload or anti-two-block condition, the signal becomes 0 volts. Furthermore, all supply voltages for the transducers are going out via the terminal board.