1-34 Functional Description
7000-TD002A-EN-P – September 2007
Transfer to Drive
To transfer a motor running on the bypass back to the drive a
Transfer to Drive command is requested. Following sequence of
events take place:
1. The drive is given a Transfer to Drive command. After a normal
start command is given, the drive closes the output contactor.
After the OP CONTACTOR STATUS input on the ACB indicates
that the output contactor has closed, there is a time delay to
allow the output filter capacitors to charge to the bypass voltage.
This delay is adjustable using DeSync Start Dly (#763). Within
this time, the drive synchronizes to the capacitor voltage with the
motor still running on bypass. The drive then deactivates its
BP_CONTACTOR output.
2. When the BP CONTACTOR STATUS input on the ACB
indicates that the bypass contactor has opened, the drive goes to
run mode. As the drive brings the motor torque up to the level
required by the load, the motor speed will drop slightly before
returning to the commanded speed.
3. The Transfer to Drive command is removed. The transfer is now
complete and the motor is running on the drive.
Synchronous Transfer
cont.
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