BERNT LORENTZ GmbH & Co. KG
Siebenstücken 24, 24558 Henstedt-Ulzburg, Germany,
Tel (+49) 0 4193 8806-700, Fax -708, www.lorentz.de
Troubleshooting guide for LORENTZ ECDRIVE submersible
All specifications and information are given with good intent, errors are possible and products may be subject to change without notice.
Pictures may differ from actual products depending on local market requirements and regulations.
4 Root cause for damages
It is very important to find the reason for a damaged motor in order to secure that the pump system
will not fail again. This section shows the most common root causes for defects.
• Overheating due to insufficient cooling
o Pump is positioned below the water inlet of the well
o Pump is sitting on the bottom of the well
o Well diameter is too big/pumping out of a tank/river/etc. without using a flow sleeve
o Water temperature is too high
• Leaky cable or cable splice
o The glue cracked during the cool down phases because it has been moved
o Outer shrinking sleeve got damaged (wires have not been cut in different lengths/well
has a sharp-edged rough surface)
o Damaged cable; water entered through the cable
• Improperly crimped cable connection
o The use of inappropriate tools leads to loose cable connections. A wire cutter, for
example, does not press the cable completely together but just weakly connects the
sleeve and the wire. Force and vibration can cause a loose contact.
o Using a section of the crimping tool which is too small
• Lightning
o Unnecessary long motor cable
o System not grounded
• Damaged cable splice
o Not properly sealed cable splice/damaged during pump installation
o Improper electrical connection between motor and submersible cable (usage of wrong
tools)
o Wires connected at the same lengths
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