Siemens SIMOVERT MASTERDRIVES Manual page 197

05.2006
REF_D = 0
This means:
In the negative direction, the reference
point crossed is ignored.
V
REF_BWD_STOP
REF_FWD_STOP
REF_STOP
via [ARFD]
D_FWD=1
REF_ON
Siemens AG 6SE7087-6QX70 (Version AG)
SIMOVERT MASTERDRIVES
The REF_D signal specifies the direction in which a "coarse pulse" is to
be evaluated. This means that the evaluation of the "coarse pulse" on
the measurement memory (position detection) in the opposite direction
with respect to [REF_D] will be ignored and that the measurement
memory will not be enabled by the BPos until the homing direction
corresponds to that indicated by [REF_D].
Sequence of homing movement D_FWD = 1
Start with D_FWD=1
Fig. 7-9 Example of homing movement sequence start D_FWD to the right from
the Proximity switch and homing direction REF_D = 0 (positive)
The setting values for acceleration and deceleration/delay are
maintained during all movements. In the case of a constant transfer
(U875.8 SPV_RIE_TYP = 1) these values can be changed with each
rising edge on U875.7 SPV_RIE, even during the homing movement.
If the axis is in the homing mode [ARFD] = HIGH, this process can be
repeated as often as required (note: 1 sampling time delay!). No user
intervention is necessary as REF_STOP (and consequently ARFD) are
reset to zero with the rising edge on REF_ON.
Homing movement with coarse pulse and zero pulse evaluation
This can be implemented if required by means of the basic unit
functionality (see position detection, function diagram 330) in the speed
controller.
Compendium Motion Control
Functions
S
S
S
S
S
S
7-31