Checking The Insulation Resistance (Wall Mounted) - Siemens SINAMICS G115D Operating Instructions Manual

Mechanical stress and grease lifetime
High speeds that exceed the rated speed and the resulting increased vibrations alter the
mechanical running smoothness and the bearings are subjected to increased stress. This
reduces the service life of the grease and bearings.
11.2.12

Checking the insulation resistance (Wall Mounted)

Only qualified personnel may work on power installations.
Unintentional starting of the drive unit
Secure the drive unit to prevent it from being started up unintentionally.
Attach a warning notice to the start switch.
Hazardous voltage and rotating parts
Before starting commissioning, mount the covers required for the correct air guidance, and
prevent contact with active / current-carrying or rotating parts.
Hazardous voltage at the terminals
In some cases, the terminals can be at hazardous voltage levels during the measurement
and immediately afterwards. The terminals must not be touched.
Carry out a check on the power cables connected to ensure that no voltage can be applied.
Note
The insulation resistance must be checked before commissioning and after lengthy periods of
storage or non-use.
Before you begin measuring the insulation resistance, please read the operating manual for
the insulation resistance meter you are going to use. Before measuring the insulation
resistance, disconnect any main circuit cables that are connected to the terminals.
Note
If the critical insulation resistance is less than or equal to this value, the windings must be
dried or, if the fan is removed, cleaned thoroughly and dried.
Note that the insulation resistance of dried, clean windings is lower than that of warm
windings. The insulation resistance can only be properly assessed after conversion to the
reference temperature of +25 °C.
If the measured value is close to the critical value, you must check the insulation resistance at
suitably frequent intervals.
SINAMICS G115D distributed drive
Operating Instructions, 09/2020, FW V4.7 SP13, A5E48681219B
WARNING
WARNING
WARNING
Additional information on the SIMOGEAR geared motor
11.2 Specific data motor
385