Lenze L-force HighLine C 8400 Series Reference Manual page 418

8400 HighLine C | Reference manual
Technology applications
TA "Switch-off positioning"
Decision criteria
Criteria
Operating mode
Limit switch evaluation
Positioning accuracy at the motor
shaft
The positioning accuracy of the load
depends e.g. on the selected
mechanics by clearance and friction
and must be determined
individually.
Speed setting range
Typical applications
System limits and exclusion criteria
They result from the non-compliance with the decision criteria.
 Compared to systems with speed feedback, the positioning and repeat accuracy is
reduced.
 Due to the mechanical hardware limit switches, this concept is only applicable for
systems with only a few fixed positions. Changing the target position during the
operation or the teaching is not possible.
 If necessary, additional functions like manual jog or homing must be realised
externally, e.g. via a control.
 As the 8400 HighLine controller does not meet safety-related functions except STO
(Safe Torque Off), you must observe that all safety-related aspects are realised by the
plant instructor.
 Especially in the case of an outdoor use or in wet areas, you must consider the
corresponding discharge currents when operated with a fault current circuit breaker.
 A table positioning or sequential positioning control is required for highly dynamic
applications and jerk-free traversing profiles which is available with the "HighLine"
device version.
Related topics:
Commissioning of the "Switch-off positioning" technology application
418
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Switch-off positioning with constant
load
V/f characteristic without speed sensor.
Alternatively for large breakaway torques: Use of a sensorless vector control
(only applicable for horizontal movements).
One limit switch is required per
direction of movement. When the
limit switch is reached, the drive is
brought to a standstill leaded by the
deceleration ramp or the QSP ramp.
The ideal case is 5-10° at the motor
shaft.
Consider the influence of the motor
temperature.
In the case of a constant load, you can
assume a good repeat accuracy
during positioning. In the case of
variable loads, you must take
significant deviations into account.
1 : 50, based on 50Hz and M
n
Switch-off positioning with constant
load, e.g. travelling drive, roll-up
door.
L
Switch-off positioning with variable
load
Per direction of movement, one
limit switch and one initiator
is required for fast/slow changeover.
When this initiator is reached, the
speed of the
drive is reduced to a creeping speed
(selected jog value). When the limit
switch is reached, the drive is
brought to a standstill leaded by the
deceleration ramp or the QSP ramp.
5-10° at the motor shaft. As the
positioning is executed in a creeping
speed, a good repeat accuracy is
reached even for variable loads.
1 : 50, based on 50Hz and M
Switch-off positioning with variable
load, e.g. travelling drive, conveying
belt, hoists approaching a stop
position
( 82)
Firmware ≤ 11.00 - DMS 6.0 EN - 10/2011
n