... PID closed-loop speed, equip with all the import 1:150 turbine speed reducer, smooth operation, speed adjustable range 0- ... 4.5If move the machine after overhaul, must check all the parts, especially the net-belt position. ... abnormal sound.9Before turn on the machine, please check the working voltage if it is in the ... same time, when turn on the machine, check the parameters are the same to the last time ...