POSICON positioning control – Supplementary manual for series SK 200E and SK 250E-FDS
76 BU 0210 en-3117
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7.2 FAQ operational problems
Typical operating errors and sources of error in connection with positioning and speed control are
listed below. It is recommended that the same sequence as for commissioning is used for
troubleshooting. Accordingly, it should first be checked whether the affected axis is running without
control. After this, the speed and position controllers should be tested.
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7.2.1 Operation with speed feedback, without position control
Symptom Cause
• Motor only rotates slowly
• Motor runs unevenly
• Incorrect assignment of the direction of rotation of the motor to the
counting direction of the incremental encoder
– Change the sign in P301
• Incorrect incremental encoder type (no RS422 outputs)
• Encoder cable interrupted
– Check the voltage difference of track A and B with P709
• Encoder voltage supply missing
• Incorrect pulse number parameterised
– Check the resolution in P301
• Incorrect motor parameters
– Check P200 et seq.
• Encoder track missing
• With active speed feedback (servo
mode enabled) the motor runs
correctly, but runs unevenly at low
speeds
• Overcurrent switch-off at higher
speeds
• Incremental encoder incorrectly mounted
• Interference in encoder signals
• Overcurrent switch-off when braking
• For field weakening operation in servo mode, the torque limit must
not exceed 200 %
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7.2.2 Operation with active position control
Symptom Cause
• Target position exceeded
• Position control P amplification considerably too large
– Check P611
• Speed controller (servo mode) not optimally set
– Set I amplification to approx. 3 % / ms,
– Set P amplification to approx. 120 %
• Drive oscillates at the target position
• Position control P amplification considerably too large
– Check P611
• Drive moves in the wrong direction
(away from the setpoint position)
• The direction of rotation of the absolute encoder does not match
the direction of rotation of the motor
– Parameterise a negative value for the speed ratio (P607)
• Drive unit sags away after enabling is
removed (lifting gear)
• Setpoint delay missing (control parameter)
• For servo mode = "Off" the control must be locked immediately by
the event "End Point Reached"
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