华-1型装岩机的扬铲电动机和行走电动机原厂配用交流接触器控制。但在使用中,由于电动机带负荷频繁地启动,接触器的触头很容易被电弧烧损。烧损的触头轻则接触不良电阻增大,触头电压降增大,使电动机达不到额定功率,严重的还将使接触器本身 China -1 rock loader mounted shovel motor and walking motor with AC contactor control. However, in use, because the motor starts frequently with a load, the contact of the contactor is easily burned by the electric arc. Lightly burning contact with poor contact resistance increases, the contact voltage drop increases, so that the motor can not reach the rated power, the serious will also make the contactor itself