Glossary
A5E01083943A AB
Siemens AG Operating Instructions 2.02 1FW4
103
External fan
With forced ventilation, the machine is cooled by a fan which is not driven by the shaft of the
machine. An externally driven fan is called an external fan.
Feather key
A feather key is a form-fitted machine element that connects a shaft and a hub, e.g.,
coupling, gear wheel. The hub is provided with an end-to-end, vacated groove, into which
the feather key is inserted. The feather key is a large, long metal part with an angular cross-
section and parallel surfaces. The feather key bears loads through its form-fitted flanks. The
feather key acts as a carrier and transfers the torque of the shaft to the component that is to
be driven.
Grease nipple
A grease nipple is a small nozzle that can be used to apply lubricant to a bearing by means
of a grease applicator. Grease nipples are commercially available in straight or angled form
with various threads for screwing them on: DIN 71412
Grounding conductor
The equipotential bonding wire is a wire that is used to connect conductive components to
each other and to establish equalization of potential.
Insulation resistance
Resistance of the insulation between two conductive components. The insulating property of
a material which isolates two adjacent contacts or a contact to ground with as high an ohmic
value as possible.
Lifting straps
Straps exclusively for lifting and transporting loads. The quality of the lifting straps is
described in the following standards: DIN EN 13414-1, DIN EN 13998, DIN EN 1492-1,
DIN EN 1492-2
Non-drive end
The non-drive end is the end of the motor to which the shaft end not connected to the driven
machine is attached. (non-drive end): DIN IEC 34 Part 7
Pulling off
Disassembling or disconnecting a part of the coupling or a bearing from the shaft.
Rated current
The rated current is the rms value of the motor current at rated voltage, which is needed in
order to exert the rated torque on the motor shaft.
Summary of Contents for 1FW4
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