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.
2.3 Mechanical inspection
For the outer investigations, there are also mechanical indicators to identify the cause of a failed
ECDRIVE. Firstly, please check whether it is possible to rotate the motor shaft. Normally, this can be
done by hand. Compare the torque with which the shaft is rotated with an intact ECDRIVE (with the
same size). Due to the strong permanent magnet, you should notice a stepwise movement.
Additionally, secure that the phases of the motor are not connected, otherwise turning the shaft is
much more difficult.
However, a motor sometimes is stuck after it has been stored. This is normal and can be fixed by
rotating it once with tools:
use a 13 mm wrench to turn the HR shaft
use a multigrip pliers to turn the NEMA shaft
(do not touch the NEMA shaft directly to avoid
any damage on the coupling)
After turning it once with tools it should be possible to rotate it again by hand.
Otherwise, there is a mechanical damage. Further investigation is possible when you disassemble the
motor. The indicators during the disassembly are listed in chapter “3 Inner observations” on page 12.
However, causes for a jammed motor shaft are:
• Overheating
• Particles entered the motor
Please check the root cause for these damages in chapter “4 Root cause for damages” on page 15.
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