Energize Systems with 24V Auxiliary Power and without Separate 240V Control Power
When you power up the drive for the first time, energize three-phase power first. When the three-phase power up is complete, then energize the 24V auxiliary power.
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.
Bus supplies ordered with the -C1 control transformer option do not require separate 240V control power.
PowerFlex 755TM System with 24V Auxiliary Power
Energize the product in the following sequence:
- Leave 24V auxiliary power (C) energized when the drive is not in operation. This keeps up the control and communication.
- 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.
- Leave the DC Precharge switches (D) 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.
- Energize three-phase power (A).
- Turn the fused disconnect switch (B) to the ‘On’ position.
- After drive system boots up, clear faults related to the three-phase outage.
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