Siemens HT-direct Operating Instructions Manual page 44

Transport, installation and assembly
3.3 Installation
Air-cooled motors
Make sure that:
● The cooling air must flow in and out without restriction
● Hot air is not sucked in again
● On the vertical motor design with air intake from above, the air inlets are protected
● If the ventilation openings have louvered covers, the openings face downwards
Balancing quality
The rotors are dynamically balanced. For shaft ends with feather keys, the type of balancing
is stamped on the DE of the shaft end of the motor:
● "H" means balancing with a half feather key (standard version). For a shorter output
● Code "F" means balancing with a whole feather key (this is a special version which must
Ensure that the output element has the correct type of balancing. Power output elements
may only be fitted or removed using suitable equipment.
Feather key falling out
The feather keys are only locked against falling out during shipping. If the motor has two
shaft ends, and a power output element is only fitted to one end, you must take steps to
secure the feather key at the other end. If the rotor has the standard type of balance "H",
the feather key must be cut back to roughly half of its normal length.
Noise emission
When assessing the noise that is emitted at a workplace (if any), take into account that the
A-weighted sound pressure level, measured in accordance with ISO 1680, namely 70 dB(A),
is exceeded if the 1FW4 motors are operated with the rated output.
Condensation water drain holes
Condensation water drain holes are located in the bearing shields on the DE and NDE and
sealed by yellow plastic plugs. Depending on the ambient conditions, it might make sense to
remove the plastic plugs.
NOTICE
Reducing the degree of protection
Nominally, the degree of protection of the motor is reduced to IP44 by removal of the plastic
plug.
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against the ingress of foreign bodies and water
element, the part of the feather key that protrudes out from the driving element and the
shaft contour must be cut back. This preserves the balancing quality.
be ordered separately).
CAUTION
A5E01083943A AB
Siemens AG Operating Instructions 2.02 1FW4