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5.4
Installing the motor
5.4.1
Preconditions for smooth, vibration-free operation
Preconditions for smooth, vibration-free operation:
• Stable foundation design
• Precise alignment of the motor
• Correct balancing of parts to be fitted to the shaft end.
• Vibration values in compliance with ISO 10816-3
5.4.2
Aligning the motor to the driven machine and mounting
5.4.2.1
Selecting bolts
• Unless specified otherwise, use fixing screws with at least strength class 8.8 to ISO 898-1
to ensure that the motor is securely mounted and to transmit the torque-generated
forces.
• When selecting the bolts and the design of the foundation, take into account the
maximum forces occurring in the case of a fault such as short circuit or system transfers in
phase opposition, etc.
Request the foundation force values from the Service Center if required.
5.4.2.2
Horizontal types of construction with mounting feet
1. Refer to any instructions for aligning the driven machine and those of the coupling
manufacturer.
2. Align the motors with coupling output to the driven machine in such a manner that the
center lines of the shafts are parallel with no offset. This ensures that no additional forces
affect their bearings during operation.
3. For the vertical positioning (x→0) place thin shims under the motor feet. The number of
shims should be kept as low as possible, i.e. stack as few as possible. This also prevents the
motor being subjected to any stress/distortion. If available, use the existing tapped holes for
the forcing-off bolts to somewhat raise the motor.
4. When positioning the motor, ensure that a uniform axial gap (y→0) is maintained around
the coupling.
5. Fix the motor to the foundation. The choice of fixing elements depends on the foundation
and is the plant operator's responsibility.
1LE7 shaft heights 71 ... 315
Operating Instructions, 04/2022, A5E51689275A-AA
Installation
5.4 Installing the motor
51
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