Efficient Networks S120 manual Example of a star/delta switchover, Preconditions, Applications

		Applications
		11.3 Motor changeover
Parameter	Settings	Remark
p0833.0..2	0, 0, 0	The drive controls the contactors and pulse
		suppression. Parking bit (Gn_ZSW14) is set.

Procedure for switching over the motor data set

1.Start condition:

For synchronous motors, the actual speed must be lower than the speed at the start of field weakening. This prevents the regenerative voltage generated from being greater than the terminal voltage.

2.Pulse suppression:

The pulses are cancelled after selecting a new drive data set using p0820 to p0824.

3.Open the motor contactor:

Motor contactor 1 is opened r0830 = 0 and the status bit "Motor changeover active" (r0835.0) is set.

4.Change over the drive data set:

The requested data set is activated (r0051 = requested data set).

5.Energize the motor contactor:

After the feedback signal (motor contactor opened) for motor contactor 1, the appropriate bit of r0830 is set and motor contactor 2 is energized.

6.Enable the pulses:

After the feedback signal (motor contactor closed) for motor contactor 2, the bit "motor changeover active" (r0835.0) is reset and the pulses are enabled. The motor has now been changed over.

11.3.3Example of a star/delta switchover

Preconditions:

●The drive has been commissioned for the first time.

●2 motor data sets (MDS), p0130 = 2

●2 drive data sets (DDS), p0180 = 2

●2 digital outputs for controlling the auxiliary contactor

●2 digital inputs for monitoring the auxiliary contactor

●1 free speed monitoring (p2155)

●2 auxiliary contactors with auxiliary contacts (1 NO contact)

●2 motor contactors with positively-driven auxiliary contacts (1 NC contacts, 1 NO contact)

●1 motor, 1 Control Unit, 1 infeed, and 1 Motor Module

Drive Functions	457
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4