Siemens 420 manual 130

3 Functions Issue 07/04

After the magnetizing time P0346 has expired, the ramp-function generator is set to the speed actual value and the motor is operated with the actual reference frequency.

	f
	fsearch,max			Setpoint frequency
	Demagnetizing Flying restart		Magnetizing	t
				Ramp up
	time	P1202	time
	P0347	P1203	P0346
Fig. 3-54	Flying restart

NOTE

If a higher value is entered for the search velocity P1203 this results in a flatter search curve and therefore to an extended search time. A lower value has the opposite effect.

For "Flying restart", a braking torque is generated which can cause drives, with low moments of inertia, to brake.

For group drives, "Flying restart" should not be activated due to the different characteristics of the individual motors when coasting down.

WARNING

When "Flying restart" is activated (P1200 > 0), although the drive is at a stand- still and the setpoint is 0, it is possible that the drive is accelerated as a result of the search current !

If the operating range of the motors is entered when the drive is in this state, this can result in death, severe injury or material damage.

MICROMASTER 420	Operating Instructions
130	6SE6400-5AA00-0BP0