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Servo control

3.11 Sensorless operation (without an encoder)

be enabled. A large discrepancy between the actual and setpoint speed can cause a malfunction.

WARNING

Once the pulses have been canceled, no information about the motor speed is available. The computed actual speed value is then set to zero, which means that all actual speed value messages and output signals are irrelevant.

Switchover between closed-loop/open-loop operation and operation with/without encoder

Operation without an encoder is activated via parameter setting p1300 = 20. If p1300 = 20 or p1404 = 0, operation without an encoder is active across the entire speed range. If the speed value is less than the changeover speed p1755, the motor is operated in accordance with the current/frequency.

During operation with an encoder, a switchover can be made to operation without an encoder when the speed threshold p1404 is exceeded. If p1404 > 0 and p1404 < p1755, a switchover is not made to operation without an encoder until the speed exceeds p1755.

Operation without an encoder is displayed in parameter r1407.1.

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Figure 3-17 Area switchover

Note

In closed-loop control operating mode "Speed controller without encoder", a rotor position encoder is not required. Since a temperature monitor is not usually connected in this case either, this must be parameterized via p0600 = 0 (no sensor).

90	Drive Functions
	Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4