Don't know what happen on motor that use for pump
Don't know what happen on motor that use for pump
(OP)
I have some problem in water pump group motor in my factory. I must be change a motor's bearing every 1-2 month because the shock pulse value exceed standard value
(~35db). I check everything and found
1. The grease (type shell R3) in Brearing non-drive change to liquid status
temperature on flange ~80 C.
2. Electric Current on ground's cable has ~16 Amps(150 Hz). We not connect this cable to ground system but we connect this cable to the copper ground rod.
3. My group motor has 10 motors (200 , 90 , 132 Kw).
(~35db). I check everything and found
1. The grease (type shell R3) in Brearing non-drive change to liquid status
temperature on flange ~80 C.
2. Electric Current on ground's cable has ~16 Amps(150 Hz). We not connect this cable to ground system but we connect this cable to the copper ground rod.
3. My group motor has 10 motors (200 , 90 , 132 Kw).
RE: Don't know what happen on motor that use for pump
RE: Don't know what happen on motor that use for pump
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RE: Don't know what happen on motor that use for pump
Jbartos and bjc have highlight most probable cause. If these are not the case decouple the motor from the pump and run, measure voltage and currents and spm again without the pump (or intermediate transmision bearing) connected.
Is it just one motor on the skid or the whole group giving problems?
are the pumps allowed to "cavitate" this can cause you some strange spm readings.
Also consider that if your ground connection resistance is up a little and you are pumping sea water or such then a real good earth will be the process via bearings and pump rotor
keep us posted
regards Don
RE: Don't know what happen on motor that use for pump
I send you a little cuestions that probably help you.
1- begin easy.
¿It´s only one motor that have the problem?
in case "yes"- The other motors have the same grease???
Discard lubrication problem.
Check the geometric line between the motor and the pump ;and the torque adjust of the mounting bolts .
Try to get an acelerometer and send us the values.
2- The electric problems leave in the bearing a very little holes, if you measure this you found a high frecuency. this is cause of the bearing balls beating in front of the hole edges.
3- low frecuency it´s a typical response from desbalance it might be mechanical or electric, in the electric case c ould be that any bars of the squirrel rotor are broken.
4- if you have the same problems in all motors change the grase i recomend you "LE" lubrication enginers monolec type.
keep au posted
Regards.