Expert settings

For the motor model-based approach to control, two different methods are available for the low-speed range in 0x2C13.

Low-speed method 0x2C13 = "Carrier based [1]"

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In the unobservable range of low speeds (|actual speed| < 0x2C10:008), a high-frequency carrier signal is switched on ("HF injection").

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The amplitude of this carrier signal is set in 0x2C10:001. Larger values lead to better position detection. If the value is set too small, then the amplitude of the carrier signal is automatically increased after controller release. This ensures that HF injection always works regardless of the setting in 0x2C10:001.

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The two parameters 0x2C10:001 and 0x2C10:008 can be identified automatically or set manually. The settings for the two parameters are not provided by the motor catalog!

Low-speed method 0x2C13 = "i/f based [2]"

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A controlled start-up takes place when |setpoint speed| < lower limit 0x2C11:001.

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During the acceleration phase, the 0x2C12:001 and 0x2C12:002 current setpoints are added and impressed on the motor.

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This method is suitable for all permanently excited synchronous motors.

NOTICE

With the Low-Speed method 0x2C13 = "i/f based [2]", an adjustable constant current is impressed in the lower speed range. If this current is higher than the rated motor current, the motor may heat up in the lower speed range. This effect increases if the motor is operated in the lower speed range for a longer period of time.

Possible consequences: Irreversible damage of the motor

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Do not operate the motor for a longer period of time in the lower speed range.

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For detecting and monitoring the motor temperature, we recommend a temperature feedback via PTC thermistor or thermal contact.

Motor temperature monitoring

Parameter

Address	Name / setting range / [default setting]		Information
0x2C13	SLSM-PSM low speed method – From version 03.00		Selection of the method for the lower speed range in sensorless control for synchronous motor (SLSM-PSM).
	1	Carrier based	Encoderless operation with HF injection. Not suitable for MCS motors!
	2	i/f based	Encoderless operation with controlled start-up. Universally suitable for all motors. Note! With this low-speed method, the set torque limits are only active in the higher speed range (closed-loop mode)!
0x2C10:001	HF amplitude 0.0 ... [50.0] ... 400.0 V – From version 02.00		Setting of the HF amplitude for low speed method "Carrier based".
0x2C10:008	HF injection range 0.5 ... [6.0] ... 50.0 % – From version 05.03		Setting of the speed range with HF injection for low speed method "Carrier based".