Freight elevator power configuration:
(l) The power supply voltage fluctuation of the guide rail type hydraulic freight elevator shall not be greater than ±5%. If the fluctuation is too large, a voltage stabilizer with corresponding power should be considered.
(2) The special power supply for the freight elevator should be directly introduced into the special distribution box from the power distribution room of the construction site. Generally, each lift needs to be equipped with a copper core cable with a diameter of more than 4m. If the distance is too long, the cross-sectional area of the cable should be appropriately increased.
(3) The special power distribution box needs to be equipped with emergency stop switch control, and the power box needs to use shock wave non-action leakage protection switch.
(4) Use a grounding resistance tester to measure the grounding resistance of the steel structure of the freight elevator and the metal casing of the electrical equipment, which shall not be greater than 4Ω. Use a 500 megohmmeter to measure the insulation resistance to ground of the motor and electrical components should not be less than 1MΩ.
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