Note：

When the lifting height is not more thean 150m and the lift acceleration and deceleration are not more than 1.0m/s2，the length of compressed spring is 168mm and the rope tension is not less than 1000N ； When the lifting height is greater than 150m and is not more than 240m or the lift acceleration and deceleration are more than 1.0m/s2，the length of compressed spring is 155mm and the rope tension is not less than 1500N.