Lenze 8400 - Manual (Page 531)

Lenze · 8400 protec HighLine · Reference manual · DMS 3.0 EN · 03/2013 · TD05
531
8 Basic drive functions (MCK)
8.11 Override
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8.11 Override
An "Override" is the change of profile parameters and their acceptance during the positioning
process.
• In this case the traversing profile has to be adapted accordingly, so that positioning is carried out
exactly to the target position defined, even if for example a change in speed occurs during the
positioning process ("Speed override"):
[8-33] Override (here: speed override)
• The override for speed, acceleration, and S-ramp time affects all motion profiles that are
controlled by the internal profile generator:
• Manual jog
• Retracting from limit switches
• Homing
• Point-to-point positioning
 Speed is reduced during the positioning process.
 In order to reach the position defined, the missing area has to be "attached" to the profile.
 Due to the speed reduction the positioning process takes longer (Δt).
v [m/s]
Œ

Ž Dt t [s]

Note!
The online change of speed and acceleration is in effect from the start of the profile until
the deceleration phase begins. Changing the deceleration phase by means of an override
is therefore not possible!
• In the case of an override value of 0 % for the speed, the drive is brought to a standstill.
• In the case of an override value of 0 % for the acceleration, acceleration does not take
place any longer.
The acceleration override also has the same effect on the deceleration ramp to the same
extent specified, but only until the deceleration phase is initiated.
The override has no impact on:
• The "speed follower" operating mode
• Synchronising processes
• Setpoint controls via external setpoints
• Abort via input bPosStop
• Speed setpoint selection in case of error (e. g. "Fail-QSP")