Balancing is performed at constant rotation speed. VM-BAL uses the rotation speed signal from the photoelectric reflex switch VM-PS which is connected to the digital input of the M302 / M312. Alternatively signals from rotor-specific sensors can be measured like, for example, the z signal of a rotary encoder.
 Signal source
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Default setting is the digital input of the USB device.
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 Maximum deviation
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Constant speed is crucial for successful balancing. VM-BAL monitors the stability of rotation speed to ensure that balancing is performed within specified limits.
The allowable deviation will depend on the type of drive and load variance. For a controlled drive with low load the preset of 2 % can be higher than the actual variations. The situation may be different for a combustion engine controlled by a foot throttle.
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 Cycles for measurement run
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Here you enter the number of revolutions used for vibration measurement. The higher the number of revolutions the better VM-BAL can distinguish unbalance from vibration of other sources.
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 Start speed
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VM-BAL covers a very wide range of rotation frequencies from 6 to 100,000 rpm and higher.
For monitoring the stability at low speeds VM-BAL needs to measure over a longer period which may take some time. Operation can be sped up by entering a minimum rotation speed. The entered value should be at least the nominal speed less the expected tolerances.
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