Speed search
Each time the modulation is switched on, the drive can perform an automatic
speed search and thus connect to a running motor. The speed search can be acti-
vated in dd16. The most favorable procedure is automatically selected internally.
When operating with an absolute value encoder, directly the speed and electrical
position are accepted.
When operating without encoder, the motor speed and the electrical position are
measured by test signals.
Activation of the automatic speed search
speed search current [In]
Selection of the measuring current for speed deter-
mination
No automatic speed search
On, high speed, emf based
Speed search for synchronous high-frequency spindles.
The counter-voltage constant of the motor is used for the
calculation of the speed.
During the speed search, the modulation is switched on briefly with zero voltage.
The speed and position are determined from the step responses of the current.
The maximum measuring current for this function can be preset with dd18.
Precondition for a successful speed search is the identification / parameterization
of the equivalent circuit data, also in v/f operation.
Protection functions (ramp stop, current limitation in open-loop (v/f) operation)
Overview of protection functions
modes of
operation
(co01)
v/f current
limit control
Limitation of the current
Limitation of the current
Ramp setpoint at accelera-
tion (ACC)
Limitation of the current
Ramp setpoint at decelera-
tion (DEC)
Limitation of the DC link
voltage
Ramp setpoint at decelera-
tion (DEC)
*) only useful in v/f, but active in all control modes
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