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HRCV rotary controller is designed and developed by my company according to user's usage of crane slewing controller, its main technical characteristics are as follows: 1. This product will be controller and SCR module combined into an organic whole, complete user wiring simple and clear, put an end to the user controller damage caused by wiring error phenomenon. 2, realize ac voltage control curve, and the best optimization dc voltage control curve. 3, when the control points to move function, achieve accurate in place. 4, industrial-grade chip electronic components imported, the directly with power and direction indicator on the control panel. 5, on printed circuit boards using coating processing, improves the circuit boards of dustproof and condensation prevention ability.