Rockwell Automation Publication 7000-UM202D-EN-P - May 2018 37
Power Component Definition and Maintenance Chapter 2
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 10,800V (7.2 kV x 1.5 pu) down to low voltage
levels that the PowerFlex 7000 analog control board (ACB) 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 ACB. 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 ACB.
Table 2
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.
Table 2 - Nominal Input Voltage Range
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.
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