Chapter 5: Detailed description of parameters
110
For detailed information about the frequency sources, see P0.03 (selection of the main
frequency source X). Different sources of running commands can be tied to the same
frequency source.
If the master source has a linked frequency source and when the frequency source process
is active, the command source set in P003 to P007 is no longer effective.
0: Direct start
If the DC braking time is set to 0, the AC motor starts running at the startup frequency. If
the DC braking time is not 0, the AC unit performs DC-braking first and then starts running
at the startup frequency. It is used in applications with low inertia when the motor is likely
to rotate at startup.
1: Re-start with speed tracking
The drive of the AC unit first evaluates the speed and direction of rotation and then starts
at the detected frequency. Such a smooth start does not affect the rotating engine. Applies
to a re-start with a short power outage at high inertia load. To ensure restarting with
speed-tracking, set the motor parameters in P2 correctly.
2: Pre-excitation (asynchronous motor)
Applies only to asynchronous motors and is used for motors with built-in magnetic fields.
For these motors, see the current and time setting in parameters P1.05 and P1.06. If the
pre-excitation time is set to 0 seconds, the unit will cancel the pre-excitation and start at
the startup frequency. If the pre-excitations not set to 0 seconds, the AC motor will be pre-
excitated before starting to improve the dynamic response of the engine.
To Next Page
