Installation manual

Configuration Mode (ConF)
246 S1A28692 03/2010
Use of the "Pulse input" input to measure the speed of rotation of the motor
This function uses the "Pulse input" input and can only be used if the "Pulse input" input is not being used for
another function.
Example of use
An indexed disk driven by the motor and connected to a proximity sensor can be used to generate a frequency
signal that is proportional to the speed of rotation of the motor.
When applied to the "Pulse input" input, this signal supports:
• Measurement and display of the motor speed: signal frequency = 1/T. This frequency is displayed by means
of the [Pulse in. work. freq.] (FqS) parameter, page 44.
• Overspeed detection (if the measured speed exceeds a preset threshold, the drive will trip).
• Brake failure detection, if brake logic control has been configured: If the speed does not drop sufficiently
quickly following a command to engage the brake, the drive will trip. This function can be used to detect
worn brake linings.
• Detection of a speed threshold that can be adjusted using [Pulse warning thd.] (FqL) page 89 and is
assignable to a relay or logic output, see page 123.
T
Time, in seconds
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