Functional Description - Parker AC30V Série Manuel Technique

D-42
Parameter Reference
PNO Parameter Descriptions
The search rate during the speed search phase of the flycatching sequence. Performing the flycatching speed search too quickly can
cause the drive to inaccurately identify the motor speed. Refluxing at an inaccurate motor speed can cause the drive to trip on
overvoltage. If this occurs, increasing this parameter will reduce the risk of tripping.
0317 Min Search Speed
Only under VHz Control
The lowest search speed before the speed search phase of the flycatching sequence is considered to have failed.
0318
Flying Reflux Time
Only under VHz Control
The rate of rise of volts from the search level to the working level after a successful speed search. Refluxing the motor too quickly
can cause the Drive to trip on either overvoltage or overcurrent. In either case, increasing this parameter will reduce the risk of
tripping.

Functional Description

The flycatching function enables the drive to be restarted smoothly into a spinning motor. It applies small search voltages to the motor whilst
ramping the Drive frequency from maximum speed to zero. When the motor load goes from motoring to regenerating, the speed search has
succeeded and is terminated. If the search frequency falls below the minimum search speed, the speed search has failed and the Drive will ramp
to the speed setpoint from zero.
The flycatching sequence can be triggered by different starting conditions:
ALWAYS:
TRIP or POWER-UP: After uncontrolled stop, i.e. trip or coast, or after a power-up
TRIP:
The type of speed sequence may be Bi-directional or Unidirectional:
Bi-directional
Initially, the search is performed in the direction of the speed setpoint. If the drive fails to identify the motor speed in this direction, a second
speed search is performed in the reverse direction.
Unidirectional
The search is performed only in the direction of the speed setpoint.
All starts (after controlled or uncontrolled stop, or after a power-up)
After uncontrolled stop, i.e. trip or coast
AC30V series Variable Speed Drive