MotorCommutationMode

General

Type	ES
Offline editable	Yes
Devices supporting the parameter	Lexium LXM52 Drive, Lexium LXM52 Linear Drive, Lexium LXM62 Drive, Lexium LXM62 Linear Drive
Traceable	Yes

Functional Description

MotorCommutationMode defines the way to determine the motor commutation.

MotorCommutationMode	Determination of the motor commutation
with motion / 0	The motor approaches different poles of the motor and averages the measured commutation offsets. For this mode, a relatively high travel range (typically several revolutions for rotary drives) is required. There must not be any mechanical obstacles in this travel range. External torque caused by friction should be restricted to 10% of the rated torque in order to avoid excessive deviations during determination. External torque which cause a motion must not be fitted closely to the motor since damages to the mechanics may result.
minimum motion / 1	The motor moves by only few degrees maximum, but usually by fewer. This mode can be used with coupled load or if the position range is limited. External moments which cause a motion must not be fitted closely to the motor so that this mode can work properly. In addition, these moments can cause damage to the mechanics since the motor cannot counteract the moments during the determination of the commutation. The drive reacts sensitively during measuring, even to small, external moments (for example, contact with the motor shaft). Variable external moments can cause mismeasurements which, however, can be detected in most cases.
Coupled brake / 2	The motor brake remains closed. Thus, the motor hardly moves. External moments practically do not influence the measurement as long as they change only slowly. Unfortunately, this measurement cannot be performed with any combination of motor and brake. If the measurement is not possible, it is detected during the determination of the commutation and a diagnostic message is triggered accordingly. With this setting, the values for the motor commutation are found, which can differ up to 30 electrical degrees from the optimal angle. Inaccurate values for the motor commutation can lead to an increase of the TrackingDeviation and a higher current demand. This is why this mode should only be used if the other modes are not possible due to the mechanical conditions.

MotorCommutationMode

Determination of the motor commutation

with motion / 0

The motor approaches different poles of the motor and averages the measured commutation offsets. For this mode, a relatively high travel range (typically several revolutions for rotary drives) is required. There must not be any mechanical obstacles in this travel range. External torque caused by friction should be restricted to 10% of the rated torque in order to avoid excessive deviations during determination. External torque which cause a motion must not be fitted closely to the motor since damages to the mechanics may result.

minimum motion / 1

The motor moves by only few degrees maximum, but usually by fewer.

This mode can be used with coupled load or if the position range is limited.

External moments which cause a motion must not be fitted closely to the motor so that this mode can work properly. In addition, these moments can cause damage to the mechanics since the motor cannot counteract the moments during the determination of the commutation. The drive reacts sensitively during measuring, even to small, external moments (for example, contact with the motor shaft). Variable external moments can cause mismeasurements which, however, can be detected in most cases.

Coupled brake / 2

The motor brake remains closed. Thus, the motor hardly moves. External moments practically do not influence the measurement as long as they change only slowly. Unfortunately, this measurement cannot be performed with any combination of motor and brake. If the measurement is not possible, it is detected during the determination of the commutation and a diagnostic message is triggered accordingly.

With this setting, the values for the motor commutation are found, which can differ up to 30 electrical degrees from the optimal angle. Inaccurate values for the motor commutation can lead to an increase of the TrackingDeviation and a higher current demand. This is why this mode should only be used if the other modes are not possible due to the mechanical conditions.

NOTE: Incorrect parameters in the encoder coupling (EncoderGearIn, EncoderGearOut, EncoderDirection), incorrect pole pair numbers, or an incorrect rotary field direction can only be detected with the MotorCommutationMode with motion / 0. In the event of other modes, no diagnostic messages are triggered for such inaccurate parameters.

NOTICE
	COLLISION WITH OBSTACLES Do not use the MotorCommutationMode with motion /0 if the area of operation is too restrictive. Failure to follow these instructions can result in equipment damage.