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.
• Check the isolation of the motor:
Secondly, check the isolation of the motor. Please go through the step by step guide “2.2.2
Check the isolation of the motor” on page 7. If the isolation between the phases and
housing/ground wire is below 0.5 MΩ, the isolation is too bad. Likely causes for a bad
isolation are:
• Leaky splicing
• Damage on the submersible cable
• Overheated motor
• Check the isolation of the cable splice:
The splicing is a very important part to secure a long running pump system. The pump system
will likely fail after several weeks or months if the splicing is done improperly. To identify
whether there has been a problem with the splice follow the step by step guide in chapter
“2.2.3 How to detect a loss of isolation of the cable splice” on page 8. This test indicates
whether there is a loss of isolation. However, this test will not check the electrical contact.
The electrical contact can depend on the environmental conditions like temperature, force
on the cable, electrical load, etc. Therefore, it is impossible to evaluate the quality of the
electrical connection. Likely causes of a loss of isolation of the cable splice are:
• Leaky splicing
• Improperly crimped cable connection
If the electrical inspection has not shown any abnormal result proceed with chapter “2.3
Mechanical inspection” on page 9.
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