Rockwell Automation Publication 750-PM101B-EN-P - April 2022 11
Chapter 1 Overview
Systems with 24V Auxiliary Power and without Separate 240V Control
Power
Bus supplies ordered with the –C1 Control Transformer option do not require
separate 240V control power.
Energize
Energize the product in the following sequence:
1. Leave 24V auxiliary power (C) energized when the drive is not in
operation. This keeps up the control and communication.
2. Leave the Control Power switches (E) for the Common Bus Inverters in
the ‘On’ position when the drive system is not in operation. This is not
needed if 24V auxiliary power (C) remains energized.
3. Leave the DC Precharge switches (F) for the Common Bus Inverters in
the ‘On’ position when the drive system is not in operation. This step is
not required for Common Bus Inverters without DC Precharge.
4. Energize three-phase power (A).
5. Turn the fused disconnect switch (B) to the ‘On’ position.
6. After drive system boots up, clear faults related to the three-phase
outage.
De-energize
De-energize the product in the following sequence:
1. Turn the fused disconnect switch (B) to the ‘Off’ position.
2. De-energize three-phase power (A). This may not be needed.
IMPORTANT
This procedure assumes that 24V auxiliary power was not removed when
the product was de-energized. If you are conducting an initial powerup,
or if 24V auxiliary power was removed, only apply 24V auxiliary power as
the final step in the Energize sequence.
(C)
24V Auxiliary Power
(A)
(B)
Three-phase Power
(F) (F)
(E)
Input Bay Power Bay Power Bay Power BayControl
Bay
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