SSD 605C Product Manual - page 97

Programming Your Application 

6-31

605C Frequency Inverter

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 Inverter 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 Inverter 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 Bidirectional or Unidirectional:

Bidirectional

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.

ACTIVE

Range: FALSE / TRUE

A diagnostic output indicating whether the flycatching sequence is active.

SETPOINT

Range xxx.xx %

This diagnostic output is the setpoint caught at the end of a successful flycatching sequence.