Yesterday we lifted the host when the exhaust valve lift suddenly can not control the vehicle cabin, check the traffic control box found in the control box power switch 3F1
Tripped power, we reset them, but still jump at power. We have received and read the factory-related drawings and specifications, the failure to continue today to check on the vehicle, the wiring (X1. 18, X1.19) disconnected from the terminal block on the 3F1 reset, that switch can be closed , that from the control box to lift the crane motor brake rectifier power cord is no problem, the problem in the brake coil to provide power to the rectifier circuit, the diode rectifier circuit damage caused by short circuit and cause the AC side power switch 3F1 jumping power. We also measured the HOISTING MOTORS (3M1.1, 3M1.2) insulation resistance and three-phase windings, that is normal; remove HOIST BRAKE coil (in front of the 3Y1 is not found, but the drawings are some) of the wiring and measure insulation and windings, also found normal. HOIST BRAKE now we provide power to the rectifier circuit integrated circuit board (A1) to claim, and called for the factory as soon as the ship (due to damage to the circuit, when the exhaust valve in the lifting hoist we only took nine before the power of cow tigers into the exhaust valve, but removed the exhaust valve on the master cylinder as the first layer hanging can not go very bad for security, and the exhaust valve is also host two other much-needed change, but Now these are not complete.).