Nord Drivesystems SK 200E Series User Manual

4 Function description
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4.2.3 Encoder monitoring
If positioning control is activated (P600, setting ≠ 0) the function of a connected absolute encoder is
monitored. A corresponding error message is generated if an error occurs. The last valid position
remains visible in the frequency inverter (P601).
Monitoring is disabled if the positioning control is not active (P600, setting = 0). Therefore no error
message is generated in case of an encoder error. The actual encoder position remains displayed in
parameter P601.
If an absolute and incremental encoder are present, the positioning difference between the two
encoders can be monitored with parameter P631 "Slip Error Abs/Inc". The maximum permissible
position deviation between the absolute and the incremental encoder is specified by the value set
in this parameter. The error message E14.6 is triggered if the maximum permissible deviation is
exceeded.
• With parameter P630 "Position slip error" the actual position of the encoder is compared with the
change in position which is calculated from the actual speed (estimated position). If the position
difference exceeds the value which is set in P630 the error message E14.5 is triggered.
This method of slip error monitoring is subject to inaccuracies due to technical reasons, so that
larger values must be set in case of longer movements. These values must be determined
experimentally.
On reaching a target position, the estimated position is replaced by the actual position value of the
encoder in order to prevent the addition of errors.
• The permissible operating range can be restricted with the parameters P616 "Minimum Position"
and P615 "Maximum Position". If the drive unit exceeds the permissible range, the error messages
E14.7 or E14.8 are triggered.
Position setpoints which are larger than the values which are set in P616 or smaller than those
which are set in P615 are automatically limited in the frequency inverter to the values which are set
in the two parameters.
Position monitoring is not active if the value 0 is set in the relevant parameter or if the value 3, 4, 5 or
7 is set in parameter P604.
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Nord Drivesystems SK 200E Series Specifications

General

Brand	Nord Drivesystems
Model	SK 200E Series
Category	Inverter
Language	English