Closed Loop
The Closed Loop feature permits the perfect synchronization between motor rotor and stator, so the motor doesn’t lose steps. This optimizes motor efficiency because only essential current is supplied. For the motor feedback feature, it’s necessary to have a feedback sensor directly on the rear shaft of a double shaft motor.
About an ‘Open Loop’ controller:
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Reliable positioning without synchronization loss
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Keeps the original position stable and recovers it automatically in case of positioning errors caused by external factors such as mechanical vibrations
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100% use of the motor torque
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Capacity to operate at high velocity related to the current control, which is adjusted depending on the load variation. Normal systems in open loop use a constant current control at all velocities without considering the load variations.
To enable Closed Loop mode:
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Define feedback parameters of PID regulator (see Schematic for Position and Velocity Modes and Schematic for Torque mode)
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Define feedback sensor type (Feedback_Settings, bit8÷bit11)
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Define feedback sensor resolution depending on the feedback sensor type
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Set Sensor_selection_code = -1
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Set bit#4 of Drive_Working_Settings (2200.2H) obj.
Related objects
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Keeps the motor in torque when the closed loop is disabled. For example, at switch-on or when the Feedback Error Alarm happens. |
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The values can be omitted if the automatic motor parameters detection is enabled. (bit9 of Drive_Working_Settings_Extended obj) |
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