Instruction Manual PSx3xxEIP
40
4.13. Reference runs
The PSx3xx positioning system is equipped with an absolute measuring system,
therefore there’s no need for a reference run when powering on the drive. However, if
in certain cases a reference run onto a hard block should be desired (e.g. uniquely
when installing the drive at a machine), the course of action should be the following:
1) Before commanding the reference run the following settings have to be carried
out:
-
set the maximum torque (Par. 68) and the maximum start-up torque (Par. 66)
to max. 10% of the nominal torque, resp. the lowest possible values
-
set the maximum holding torque (Par. 72) and the maximum holding torque at
end of run (Par. 70) to 0
-
set the rpm limit for aborting run (Par. 60) to 60
-
set the time elapsed until speed falls below rpm limit for aborting run (Par. 74)
to 100
(The span of time in which the drive trys to get over the block, decreases:
With the reduced values the positioning will be aborted if the speed stays
below 60% of the target speed for longer than 100ms. By default, these
values are 30% and 200ms.)
-
set the corresponding upper and lower limit (Par. 36 or 38) in a way that the
block location lays considerable within the area between the upper and lower
limit
(Otherwise there’s the danger that the block is located within the positioning
window and consequently won’t be recognized.)
-
Where appropriate, reduce the target speed for manual run (Par. 58).
2) Now start the reference run as manual run, i.e. set bit 0 or 1 and the release bit
(bit 4) in the control word.
3) Wait for the drive moving (bit 6 in the status word is set).
4) Wait for the drive has stopped and a positioning error has appeared (bit 6 in the
status word is cleared, bit 10 is set).
5) Start a manual run in the opposite direction with the same settings (move a
certain distance away from the hard stop in order the drive can move freely).
6) Only now adjust the desired settings of the adove mentioned parameters for
normal operation.
4.14. Reverse drive
In vertical positioning with spherical roller spindles, pitches of approx. 4..10 mm and
weights from 100 kg, it is possible that the PSx3xx does not consume any energy
from the motor supply when travelling downwards, but rather generates some. This
regenerative operation is permissible under certain conditions. The energy generated
is fed back into the motor supply network via the internal regenerative circuit and
must be drawn off there. The PSx3xx increases the voltage in the motor supply
network until the additional energy is drawn off. However, the internal protection diode
limits this voltage to max. 31 VDC.
The following cases should be considered:
1) If several PSx3xx and/or other loads are connected to the same power supply,
regeneration is possible without any additional measures if several PSx3xx do not
generate power simultaneously. The other devices then act as consumers of the
energy generated by a PSx3xx.
2) If several PSx3xx are to use the regenerative circuit simultaneously, an
overvoltage protection must be provided in the motor supply network.
If a PSx3xx is operated for more than 1-2 seconds in regenerative mode without
consumer of the generated energy, this damages the internal protection diode and
the PSx3xx is defective.
