4.4.4 Brief Description Of The Pre-Charging Sequence - KEB COMBIVERT R6-S Series Instruction Manual

4.4.4 Brief Description of the Pre-Charging Sequence
There are three switches coming from the external controller.
S1 engages the contactor K0, which sub-sequentially engages contactor K2 for system pre-
charging. This should be activated first.
S2 enables the R6 unit given that K0 is already engaged.
S3 enables the F5 drive given that there is not fault on the R6 unit.
Sequence of events:
1. S1 switch is closed by the external controller, closing the K0 contactor.
2. K0 13-14 (NO) closes, sending the control voltage (120VAC) to X1B.14 and through
K1 21-22 (NC) to the K2 pre-charging contactor coil. Also K0 23-24 (NO) closes,
allowing S2 to enable the R6 unit when switched by the external controller.
3. K2 pre-charging contactor closes, allowing L1 and L2 to connect with pre-charging
terminals X1C L1 and L2.
4. Once pre-charging is complete, X1B.13 activates contactor K1. K1 closes, allowing
L1, L2, and L3 to connect with the main power terminals on the R6 and the
auxiliary contact K1 21-22 opens, opening K2 pre-charging contactor so the
pre-charging is disconnected.
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