The single-axis controller QT7B is a rugged switching device according IEC standard for hoisting applications. The modular design enables the switching device to be used universally.

1. Applications: The master controller QT7B series is a rugged switching device according to the IEC standards for hoisting applications. The modular design enables the switching device to be used universally. A. It is suitable in AC 380V, 50Hz and DC 220V multi- direction control circuit.B. The simulative controller, is suitable in DC for timing, commutating, and signals transfer.

2. Working condition: 2. 1 Permissible ambient temperature between -30ºC to +60ºC2. 2 Height no more than 2, 000 meters2. 3 The relative humidity does not exceed 85%2. 4 Degree of protection: IP54

3. Frame summarizeThe master controller is made up of control device and cam switch. The joystick of the control device has three types: Round, squareness, squareness with button. It works by gear drive. Operate the joystick, via the gear transmission, make the cam of the switch drive, so the opening and close of the contact group will come true. We also can produce the master controller with spring return, interlock in zero position, also can install potentiometer, rotary transformer, self-angle-cleaning device, optoelectronic encoder, rotary encoder according to clients' request. For avoid mistakes (I.E. When impacted) we installed the device with interlock in zero position, the joystick is made of the upper and nether hemispheres, the joystick will be off the zero position until the nether hemispheres was pushed up, then it can be operated. Disentwine the nether hemisphere and continue once the joystick does not in the zero position. The max. Operated angle of the joystick is + /- 42°, the max. Actuating force is 20N, switching sequence 6-0-6. One control device can control no more than 2 cam switches. The joystick can be operated "+" or "*" shaped when control 2 cam switches, the joystick can be operated "|" or"-" shaped when control 1 cam switch. There are no more than 12 contacts mounted in one cam switch normally, can mounted 17 contacts specially.

4. Technical data 4.1 This crane controller is suitable for 8 hours/day working and discontiguous working system, the operate frequency is 1, 200 cycles/h, loading ingredient 40%. 4.2 The degree of protection of shell is IP30. 4.3 The mechanical life of the control unit is 3 million operating cycles under the rated frequency, electrical life is 600 thousand in AC-15 application, 300 thousand in DC-13 application.

5. Figure and installation dimension 5.1 Look at picture 1 for the figure and installation dimension of control unit.

6. Installation, debugging, maintenance6.1 M12 installed bolts are used for fixing the controller. 6.2 According to the request of the electrical theory, should be control step by step, look over if the contact close or open is according with the switching sequence, if not, please adjust it or replace the cam sheet. 6.3 Before controller electrified, please cut the master switch of the control screen off, only operate the control loop to look over if the running programs of the controlled contacts are correct. 6.4 After the controller electrified, please check the running of the motor carefully according to the catalog of the controller and control screen. 6.5 The controller should be examined and maintained frequently according to the following requests: 6.5.1 The joint of bolts should be fixed firmly 6.5.2 The parts which are often rubbed should be kept lubricative