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Functions, monitoring and protective functions
9.4 Extended functions
Absolute encoder adjustment
When commissioning an absolute encoder for the first time, a mechanical axis position is
aligned with the encoder absolute position and then the system is synchronized.
After the drive has been switched off the encoder position information is retained. This
means that the axis does not have to be readjusted when the drive powers up.
Note
It is crucial that absolute encoders are adjusted the first time that they are commissioned.
Requirements
The following requirement must be satisfied before the adjustment:
● The axis is located at a defined reference position.
Procedure
1. Call the adjustment using parameter p2507 = 2.
Please observe the following information relevant for this particular step:
– Using the reference point coordinate in p2599, an offset value is determined and
– If the drive had identified the adjustment, then note (Alarm A7441) is displayed.
– Note down the offset value that has possibly been determined so that you can enter
2. Save the offset of the absolute encoder adjustment in p2525 in a non-volatile fashion
(RAM to ROM).
Please observe the following information relevant for this particular step:
– If an adjustment is lost on an already adjusted axis, the axis will remain unadjusted
Note
After being commissioned for the first time, carefully ensure that the drive train and its
configuration cannot be mechanically changed or modified. When mechanical changes
are made, the synchronization between the encoder actual value and the machine zero is
lost. In this particular case, it is crucial that the axis is readjusted.
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entered into p2525. The offset value is used to calculate the position actual value
(r2521). Using value "3", parameter p2507 signals that the adjustment is valid. In
addition, bit r2684.11 (reference point set) is set to a value of "1".
The user is prompted to save the adjustment from RAM to ROM.
this into p2525 when using the "Absolute encoder adjustment with offset acceptance"
function.
even after a POWER ON of the drive unit. In this particular case, it is crucial that the
axis is readjusted.
Operating Instructions, 12/2018, A5E36652151A
Enclosed Drives
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