halstrup-walcher PSW 31 14 Series, Оригинальное руководство пользователя

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Instruction Manual PSx3xx-PN
37
4.4 Readjustment in case of manual displacement externally
If after a correctly finished positioning run (or a manual run to the range limit) during
standstill the PSx3xx is displaced by external force opposite to the loop direction and
the release bit (bit 4 in the control word) is set and the readjustment function (Par. 47)
is enabled, the device will attempt to reach the previously transmitted target value
once again (readjustment). After succesful readjustment bit 0 will be set again The
device does not attempt to readjust if rotated in the loop direction; it merely sets bit 11
in the status word (“manual displacement”) and resets bit 0 (“target position
reached”). If the loop run is disabled (Par. 45 is 0), the drive readjusts the position in
both directions.
If at standstill the drive continuously looses its position, the attempt to
readjust starts exactly when the actual position is leaving the
positioning window (assumed that all the conditions above are being
fulfilled). The motor power has to be in a valid range at the time when
this transition happens (e.g. Bit 4 in the status word is being set). If the
motor power is missing at that time, the readjustment fails and bits10
(“positioning error”) and 13 (“motor power was missing”) will become
active. If later the motor power comes back again (after leaving the
positioning window), there will be
no further attempt to readjust. This
is to prevent a situation that suddenly a drive begins to run if motor
power is being switched on.
If an ongoing positioning run or manual run is aborted (relaese bit in the control word
to 0), the drive readjusts the position not before a new run is being sent and finished
successfully.
Deasserting the release bit and/or disabling the readjustment function can completely
disable the readjustment process.
Drives with a brake generally don’t have a readjustment function.
4.5 Calculating the absolute physical position
The PSx3xx actuator includes an absolute measuring system with measurement
range of 256 rotations. In order to avoid an overflow when the drive is switched off
and moved by an external force, the user can only command positionings in the range
of 250 rotations. Thus the upper as well as the lower 3 rotations of the measurement
range are inaccessible.
The mapping of the desired positioning range to the physical positioning range is
done with the help of the parameter “upper mapping end” (Par. 41).
In the delivery state, the drive is at position 51200, the upper limit switch is set to
101200 and the lower limit switch is set to 1200, yielding a positioning range of ±125
rotations (±50000 increments). So if the desired positioning range doesn’t exceed
±125 rotations, in delivery state none of the following actions to adjust the positioning
range have to be taken.
For the realization of any desired positioning range independent of the possible
positioning range which is defined by the mounting situation (physical positioning
range) there are the following two possibilities:
1) Move the axle (for example a spindle) to the desired position, then move the drive
(with opened collar) to the position value which belongs to the physical position of
the axle, only then close the collar.