Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - Classic Control - Manual (Page 355)

Component Definition and Maintenance 6-65
7000 “B” Frame 7000-UM150I-EN-P – June 2013
Control Power Components
There are two configurations in which control power will be
distributed for the drive. The different methods are dependent on
what drive option the customer has chosen:
1. Standard control with 5 cycle ride-through, or
2. Standard control with extended ride-through capabilities.
Ride-Through
Standard controls with 5 cycle ride-through – The drive main
control boards will remain energized for a total of 5 cycles after
control power is interrupted. If control power is not restored during
the 5 cycles, a controlled shutdown will occur.
Standard controls with extended ride-through capabilities – The
drive controls will remain energized for an extended period time
greater than 5 cycles after control power is interrupted. The length
of time the boards will remain energized is dependent on the capacity
of the UPS and power consumption of loads connected to the UPS.
Figure 6.48 illustrates the control design with standard offering and 5
cycle ride-through. The ride-through is provided by the hold-up
capacitors on the output of the AC/DC converter. The stored energy
in the capacitors is sufficient to maintain 56 V supply to the DC/DC
and IGDPS loads for 5 cycles. Other loads such as the printer,
PV550, pilot lights, relays, etc. will remain in the same state prior to
interruption of control power.