Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control (PanelView 550) - Manual (Page 29)

Rockwell Automation Publication 7000-UM151E-EN-P - January 2013 29
Component Definition and Maintenance Chapter 3
Voltage-Sensing Assembly
The voltage-sensing assembly consists of the voltage sensing board and the
mounting plate. The voltage sensing board has six independent channels that
convert voltages as high as 10800V (7.2kV x 1.5 pu) down to low voltage levels
that the PowerFlex 7000 control logic (i.e. Signal Conditioning Board - SCB) can
use. To measure up to twelve independent voltage channels, link two assemblies
together, with one assembly acting as the master assembly and the second as the
slave assembly. In linked assemblies, the master assembly sends the twelve voltage
signals to the SCB board. For drives requiring the synchronous transfer option,
use one additional module.
This assembly uses a separate connector to output the transfer voltages directly to
the SCB board.
The following table shows the input voltage ranges for each input terminal on the
voltage-sensing board. There are four separate inputs taps for each independent
channel. This assembly operates at a nominal input voltage of up to 7200V with a
continuous 40% overvoltage. The output voltages scale to provide almost 10V
peak for a 140% input voltage at the high end of each of the voltage ranges.
Each channel has four taps that provide a range of input voltages and software to
provide a given amount of gain, so that 140% will correspond to the maximum
numerical value of the analogue to digital converter.
Nominal input voltage range
Replacing the Voltage-Sensing Circuit Board Assembly
The number of sensing boards is dependent upon the drive rectifier
configuration.
1. Ensure there is no power to the equipment.
Tap Voltage Range
D 800 - 1449V
C 1450 - 2499V
B 2500 - 4799V
A 4800 - 7200V
ATTENTION: Reconnect the grounds on the voltage sensing boards.
Failure to do so may result in injury, death or damage to equipment.
ATTENTION: To prevent electrical shock, disconnect the main power
before working on the sensing board. Verify that all circuits are voltage-
free, using a hot stick or appropriate high voltage-measuring device.
Failure to do so may result in injury or death.