Instruction Manual PSx3xxMod
28
To prepare the function of the external keys, the corresponding key contact (pin 2 or 3
of the 4-pin plug) must be connected with +24V (pin 1). If the key signal is generated
by a voltage source which is galvanically separated from the internal voltage source
of the drive, GND (pin 4) must be connected.
h) Devices with optional holding brake
The device models PSx30xMod-14, PSx31xMod-14, PSx32xMod and PSx33xMod
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, to a maximum of the level of the nominal torque. A small degree of
rotation always occurs at the output, i.e. the brake cannot be used to hold the drive at
a defined position (for this purpose where appropriate the holding torque might be
increased with the help of HR 78 and HR 79).
To release the brake when a run command is transmitted, these devices first wait for
a short time (by default 0.15 sec before beginning the run, HR 88) and then run a few
increments against the actual direction of movement (number of increments: HR 62).
The brake is closing at the end of every run (by default 1 sec after the end of the run,
HR 89). The advantage of this feature is, that in case of many subsequent runs the
brake has not to be released anew each time.
To adjust the position of the drive manually, it is first necessary to remove the rubber-
plug in the top cover (see drawings at the end of these instructions). Then release the
brake by pressing down and simultaneously turning using a hex wrench NW3
(PSx31xMod and PSx33xMod) or NW4 (PSx30xMod and PSx32xMod).
i) Devices with optional friction brake
The device model PSE34xxMod can be supplied with an optional friction 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.
j) Reference runs
The PSx3xxMod 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:
