Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control - Manual (Page 135)

Rockwell Automation Publication 7000-UM202B-EN-P - June 2014 135
Component Definition and Maintenance Chapter 3
Figure 124 - 300W AC/DC power supply (heat pipe)
The UPS is installed in the incoming cabling section, below the LV control
section.
The UPS will keep control power to all the critical 120VAC loads and an extra
AC/DC power supply that feeds the DC/DC power supply for powering all the
drive control components. The main drive cooling fan, and the AC/DC power
supply that feeds the IGDPS boards are not powered from this UPS.
The UPS uses the AS400 communication protocol, and feeds several status
signals back to the ACB to control responses to various conditions including low
batteries, loss of input power, UPS on bypass, etc.
If the customer has an external UPS, the firmware will not expect any of the
signals mentioned in the above section, and will not display any information
relating to the UPS status. The firmware will operate in the same manner with
respect to the operation of the drive with an internal or external UPS.
The output of the UPS feeds a 300W AC/DC power supply. This is 20% of the
standard AC/DC power Supply used in the drive because the load represented by
the DC/DC power Supply is much smaller than the load of the IGDPS boards,
and we are able to reduce the size accordingly. We still use the standard AC/DC
power supply to feed the IGDPS boards. The 300W AC/DC power supply has
its AC input monitored by the UPS, and the DC output is monitored by the
ACB board for fault conditions.
There is also a hold-up capacitor on the output of the 300W AC/DC power
supply to maintain the 56VDC in the event of a failure of the power supply.
300W AC/DC
Power Supply
Hold-up Capacitor
Holding Bracket
UPS