The crest two-way gantry crane will be used to operate the intake main trash racks, the intake auxiliary trash rack of power station, the power intake maintenance gate, the spillway intake maintenance gate and the trash raking grab. The automatic hydraulic lifting beam is controlled by a hydraulic pump drove by an AC motor; The operation of inserting and release of pin is controlled by electromagnetic change valve. The indicates are given for operator's observation and operation when lifting beam falling to position, inserting and release of pin. The power supply and transmission of control signals of hydraulic lifting beam is realized through cable drum and waterproof connections. 1)The lifting mechanism of crane is equipped with altimeter and master controller to control gate position and protection of position limit. 2)The lifting mechanism is equipped with load limiter to provide protection for overload and underload. 3)The traveling mechanisms are equipped with position switches, crane stop and bumper to ensure traveling safety of crane. 4)The wind meter is located on the top of machine house, the crane isstopped when wind speed exceed the design wind speed. 5)The lightning arrester is located on the top of machine house. The main lifting and auxiliary lifting mechanism are equipped with altimeter and master controller to display and control the position of lifting beam and gate. The sensor of altimeter shall be absolute rotary coder and the upper and lower limit positions of lifting beam and gate shall be controlled by sensor of altimeter. In case of failure for sensor, the master controller shall be operated automatically to break off power when gate reach to upper and/or lower limit position. 1)The power for crane isAC380V/AC220V. The power feeding to control panel by bus bar and collector. 2)The control core is Programmable Logic Controller(PLC) -Schneider[1] M340 series and YASKAMA [2] VFD (Variable-frequency Drive). All engines for main and auxiliary lifting mechanism are variable-frequency engines. 3)In operation cabin, there is Schneide Touch-Screen (10""LCD). The operation is mainly by master controller on co-operating board with press buttons and by LCD as auxiliary operation. 4)The instrument board is located in the operator's room showing the data of lifting height, load and wind speed. 5)The control panel is installed in machine room. The hygrothermograph(moist detector) is equipped on the control panel. The heater will start up automatically when humidity is heavy so that to prevent dew in panel. Performance Feature: 1)Reasonable structure, main girder deflection <1/1000S FEM STD 2)Favorable performance 3)Smooth starting and stopping 4)Safe and reliable traveling 5)Low noise, commodious cabin and good view 6)Convenient maintenance, excellent exchangeability for parts and components 7)VVVF control on driving. Safety feature: 1)Overload protection switch 2)Up/down limited position protection switch 3)Bridge traveling end position protection switch 4)Crab traveling end position protection switch 5)Emergency stop 6)Voltage lower protection function 7)Phase sequence protection function Control method: 1)Pendent 2)Remote control 3)Cabin control 4)Multi-operation Surface pretreatment and Painting: 1)Surface treatment: SA2.5 as per GB8923--1988 (NACE No. 2/SSPC-SP10) 2)Color: Yellow (or as per customer RAL code) 3)Dry film thickness: ~120µ M
