Working environment and condition of overhead traveling crane

(1) crane to three-phase AC power supply (three-phase four wire), the frequency is 50Hz/60Hz, voltage is less than or equal to 1000V (according to the requirements for the 3kV, 6kV or 10kV). Voltage fluctuation of power supply system in the crane feeder pick-up should not exceed the rated voltage of + 10%.

(2) the track installation of crane should meet the requirements of class GB/T tolerance.

The grounding resistance value of crane running track shall not exceed 4 ohm.

When the elevation of crane installation site is no more than 1000m (over 1000m), the motor should be checked according to the provisions of GB 755, and the capacity check should be carried out when the electrical equipment exceeds 2000m.

(3) the radiant heat temperature of the crane to the crane hook is no more than 300 degrees centigrade.

(4) the climate condition of crane working indoors:

The ambient temperature is not more than +40 degrees centigrade, and the average temperature in 24h is not more than +35 centigrade;

The environmental temperature is not less than 5, and the relative humidity is not more than 50% at the temperature of +40.

(5) the climate condition of crane working outdoors:

The environmental temperature is not more than +40 degrees centigrade, the average temperature in 24h is not more than +35 degrees centigrade, and the environmental temperature is not less than 20. When the ambient temperature is not more than +25 degrees centigrade, the relative humidity can be temporarily up to 100%.

(6) work wind pressure should not be greater than: Inland 150Pa (equivalent to 5 class wind), coastal 250Pa (equivalent to 6 class wind); non working state of the maximum wind pressure: generally 800Pa (equivalent to 10 class wind), can also be ag