A p p e n d i x D : P r o g r a m m i n g
D-57
AC890PX AC Drive
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: All
starts
(after controlled or uncontrolled stop, or after a power-up)
TRIP or POWER-UP:
After uncontrolled stop, i.e. trip or coast, or after a power-up
TRIP:
After uncontrolled stop, i.e. trip or coast
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.
Summary of Contents for AC890PX Series
Page 8: ......
Page 12: ...1 4 C h a p t e r 1 G e t t i n g S t a r t e d AC890PX AC Drive...
Page 17: ...C h a p t e r 2 P r o d u c t O v e r v i e w 2 5 AC890PX AC Drive 890PX bottom wire entry...
Page 22: ...2 10 C h a p t e r 2 P r o d u c t O v e r v i e w AC890PX AC Drive...
Page 74: ...4 8 C h a p t e r 4 A s s o c i a t e d E q u i p m e n t AC890PX AC Drive...
Page 96: ...5 22 C h a p t e r 5 O p e r a t i n g t h e D r i v e AC890PX AC Drive...
Page 162: ...8 22 C h a p t e r 8 T r i p s F a u l t F i n d i n g AC890PX AC Drive...
Page 170: ...9 8 C h a p t e r 9 R o u t i n e M a i n t e n a n c e R e p a i r AC890PX AC Drive...
Page 286: ...D 84 A p p e n d i x D P r o g r a m m i n g AC890PX AC Drive Functional Description...
