Operation With Anti-Condensation Heating; Insulated Bearings - Siemens H-compact PLUS Operating Instructions Manual

Operation

8.2 Operation with anti-condensation heating

8.2 Operation with anti-condensation heating
CAUTION
Operate the anti-condensation heating only if the motor is shut down
Operating the anti-condensation heating when the motor is running can result it in
overheating. Material damage can result.
Only run anti-condensation heating when the motor is shut down. For this purpose, install
an appropriate interlocking circuit with the main switch of the machine when setting up the
electrical system. Before switching on the machine, ensure that the anti-condensation
heating is de-energized.
[ID 1087.01x]
8.3

Insulated bearings

Bridging the bearing insulation
This motor is fitted with electrically insulated bearings at the DE and/or NDE ends. An
insulated bearing on the DE side is normally jumpered by an electrically conductive
connection in order to keep the rotor at frame potential.
Observe the notices on the machine relating to bearing insulation and possible bridges.
Do not open the bearing insulation bridge
Removing the factory-fitted bridging of the insulated DE bearing leads to potential
differences between the rotor and the grounded motor. This can cause the generation of
sparks, which especially in an explosive atmosphere ignite the surrounding gas. There is
also a risk of an electric shock. This can result in death, serious injury or material damage.
Do not open the bridging of the bearing insulation on the DE side during operation.
If a special variant is used, among other things if the motor is connected to a converter, the
shaft is grounded via a shaft grounding device on the DE or NDE side.
Do not bridge the insulation on the insulated bearing
In the case of the version with a shaft grounding device and insulated bearings on the DE
and NDE sides, bridging the insulated bearing results in electric current flowing via the
motor frame and possibly via the coupling to the driven machine. This can lead to death or
serious injury as a result of electric shock, or bearing damage caused by current flowing
through the bearing.
Do not bridge the bearing insulation on the insulated bearing while the machine is running.
Keep the insulation points clean. Use insulated couplings. [ID 199.4]
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WARNING
WARNING
Siemens AG Operating Instructions 1.03 1RQ671...-Z
WOGeneric TEAAC / 2008