69 - PVD3627-August 2011
4.2.5.
The delivered motor has been controlled and burned in. Nevertheless, it is recommended
to start it gradually by 1000-rpm steps with a speed ramp, during 1 minute for each step
until the maximum speed. Monitor the bearing temperature. It must be stabilized. Typical
temperatures are 60-70°C.
Motor startup
Attention
: Strong speed step without speed ramp can damage bearings or
can excite natural frequency.
4.2.6.
Once the motor is fixed on its frame and linked with the driven load, it is highly
recommended to check complete shaft line balancing to minimize vibrations.
Shaft line balancing and vibration control
Moreover, it is highly recommended to implement a vibratory control in accordance with
the ISO 10816 standard: the efficient speed vibration on the frequency range between 10
to 1000Hz must not run over 2.8 mm/s for an endless supply.
The motor has to be tested on the whole speed range in order to detect a potential natural
frequency with the frame.
Rotation speed for which a resonance appears have to be avoided or the resonance has
to be suppressed.
