7
Inspection and maintenance
62
03.2018
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7.3
Motors
DANGER
Electric shock hazard
. Some motor parts are live. Any contact with live parts can cause
severe injury or death. Motors have dangerous rotating parts and hot surfaces.
Ensure that:
•
the motor runs correctly (e.g. no variations in speed, no noise emission),
•
there are no strong vibrations.
The insulation resistance must be checked after a long period of storage or shutdown, if
possible at a winding temperature of
+68°F … +86°F
. Before starting to measure the
insulation resistance, pay attention to the operating instructions of the insulation
measurement instrument being used.
Measuring voltage: 500 V.
Minimum insulation resistance for new, cleaned or overhauled windings: 10
MΩ.
Critical specific insulation resistance after a long period of operation: 0.5
MΩ / kV.
If the critical insulation resistance is reached or undershot, the windings must be dried, or
thoroughly cleaned and dried after removing the rotor.
