Instruction Manual PSx3xxEC
32
4.12
Devices with optional holding brake
The device model PSE34xx can be supplied with an optional holding brake. This
brake prevents the output shaft from turning when the power supply to the motor is
removed, or, if the motor holding torque is too low.
A run command is not approached immediately but only after a short idle period to
tighten the brake.
The brake releases at the end of every run.
To adjust the drive manually, it is first necessary to remove the corresponding rubber-
plug in the top cover (see drawings at the end of these instructions). The drive can
then be rotated using a hex wrench NW4. This is quite difficult as the operator has to
overcome both any torque present at the output and the force of the friction brake.
manual adjustement
under cover
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 (SDO #2014) and the maximum start-up torque
(SDO #2018) to max. 10% of the nominal torque
-
set the maximum holding torque (SDO #202B) and the maximum holding
torque at end of run (SDO #2042) to 0
-
set the rpm limit for aborting run (SDO #201A) to 60
-
set the time elapsed until speed falls below rpm limit for aborting run (SDO
#201B) 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 (SDO #2016 or #2017) 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 (SDO #2013).
