SIEB & MEYER SD2, Translation Of The Original Instructions

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is FREQUENCY_IN_LIMITS, although the actual frequency of the motor is higher than
the parameterized limit value:
Fig. 6: Timing diagram of the SLOF function – wrong time point of activation
WARNING
Time point of function activation (SLOF)
If the SLOF function is activated when the reference frequency is already below
the parameterized limit frequency but the actual frequency of the motor is still
above that limit value, the drive already generated the status signal
FREQUENCY_IN_LIMITS.
To prevent material damage and personal injury the SLOF function must only be
activated during the following states:
▶ Reference and actual frequency are both below the parameterized limit
frequency.
▶ Reference and actual frequency are both above the parametrized limit
frequency.
4.2 Application
The limitation of the rotating field frequency can be used as follows:
▶ to limit the tool speed (drill/cutter)
▶ to protect maintenance and service staff
▶ as burst protection for grinding and dressing wheels
W
Safe Limited Output Frequency (SLOF)
Drive System SD2 - Safety Functions SFM / SLOF 19
4