Submersible Pump Oddities.
Submersible Pump Oddities.
(OP)
Had some problems starting up a submersible pump today. It's late and I'm too tired to repeat this, so please check it out here:
http: //www.lmpf orum.com/v iewthread. php?tid=67 1&page =1#pid1876
Please feel free to post replys to either site.
Thanks in advance.
http:
Please feel free to post replys to either site.
Thanks in advance.
"Venditori de oleum-vipera non vigere excordis populi"





RE: Submersible Pump Oddities.
I agree with you, with respect to, centrifical + no flow = no load. The motor should spin. In fact it should have little load when starting.
I don't believe that it is jamming because of power being applied. It is jamming for mechanical reasons. Cut to the chase. Pull it.
It may have rotated a few times on that first try but that was it. There's a rock in it or some debrie from the last blowout, maybe a piece of wire, insulation or??
Good luck!
RE: Submersible Pump Oddities.
"Venditori de oleum-vipera non vigere excordis populi"
RE: Submersible Pump Oddities.
Regards,
RE: Submersible Pump Oddities.
RE: Submersible Pump Oddities.
"Venditori de oleum-vipera non vigere excordis populi"
RE: Submersible Pump Oddities.
Someone has some explaining to do... but not me
RE: Submersible Pump Oddities.
RE: Submersible Pump Oddities.
SquareDs pamphlet on variable frequency drives HIGHLY recommends that you use a motor overload relay between the drive and the motor even if the drive has an internal software overload relay. Software overload relays are not foolproof and an external relay also will serve to protect mechanical components. Any motor thermostat should only be used to confirm that motor cooling works. In 1 VFD application on 5 steel coil straightneners I had to set the overload relay for 2.5 HP even though the motors and gearboxes were rated 3 HP. The problem was that in the high ambient inside of a large closed box the gearbox would overheat and pop the output shaft bearing and seal When operated at 3 HP. ONe steel coil straightener somehow had high internal friction because of component tolerances that were somehow unlucky.
Turns out that all of the VFD people over at General Electric use SquareD's VFD pamphlet.
RE: Submersible Pump Oddities.
"Venditori de oleum-vipera non vigere excordis populi"