Pneumatic down-the-hole (DTH) hammer has been extensively used in air drillings through hard and ultra-hard geological formations. Numerical modeling can offer close observation on the working behav.
[pdf] Should be in the mage-ohms (you need an isolation tester / high voltage ohm meter for this). Check the voltage when the compressor is running. If the voltage drop significantly when the compressor starts/runs, you have a bad connection somewhere. Check all relays, fuses and electrical connections.
[pdf] Firstly, check if the screw air compressor machine automatically stops working properly; Then check if the automatic switch and thermal relay are working, if they cause the cooling fan motor to stop, or if the exhaust temperature is too high or the pressure is too high, and if the motor voltage is normal.
[pdf] 
