Energize Systems with 24V Auxiliary Power and with Separate 240V Control Power

This procedure covers systems with 24V auxiliary power and with 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, 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 power-up, or if 24V auxiliary power was removed, only apply 24V auxiliary power as the final step in the energize sequence.
Bus supplies ordered without the -C1 control transformer option require separate 240V control power.
PowerFlex 755TM System with 24V Auxiliary Power and with 240V Control Power
A PowerFlex 755TM bus supply with common bus inverters with callouts indicating power connections and switches.
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.
  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 240V control power (D).
  5. Energize three-phase power (A).
  6. Turn the fused disconnect switch (B) to the ‘On’ position.
  7. After drive system boots up, clear faults related to the three-phase outage.
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