Rockwell Automation 7000A PowerFlex Medium Voltage Drive (A-Frame) - Classic Control - Manual (Page 312)

6-8 Component Definition and Maintenance
7000A-UM150F-EN-P –June 2013 7000 “A” Frame
Converter Cabinet
The converter cabinet contains three rectifier modules and three inverter
modules. Figure 6.7 shows a 3300/4160 V converter with a PWM
Rectifier.
Isolated Gate Driver Power Supplies (IGDPS) are mounted on the
cabinet‟s right side sheet (6600 V, 2400 V Drives) and on the cabinet‟s
left side sheet (3300 V, 4160 V Drives).
Thermal sensors are installed on the top module of the inverter and
rectifier. The exact location depends on the drive configuration.
Voltage-Sensing Assembly
The voltage-sensing assembly consists of two voltage sensing boards,
mounting plate and protective cover. Each voltage sensing assembly has
six independent channels which convert voltages up to 10800V (7.2kV @
1.5 pu) down to low voltage levels which can be used by the PowerFlex
7000 “A” Frame control logic (i.e. Signal Conditioning Board - SCB). For
drives that require the synchronous transfer option, one extra assembly is
used. This extra assembly uses a separate connector to output the transfer
voltages directly to the SCB board.
Below is a table of the input voltage ranges for each of the input terminals
on the voltage-sensing board. There are four separate inputs taps for each
of the six independent channels. This assembly has been designed to
operate at a nominal input voltage of up to 7200V with a continuous 40%
overvoltage. The output voltages are scaled to provide close to 10V peak
for a 140% input voltage at the high end of each of the voltage ranges.
Each of the channels has only four taps, thus they must be used to provide
a range of input voltages and software will be used to provide a given
amount of gain so that 140% will correspond to the maximum numerical
value of the analogue to digital converter.
Table 6.A – Input Voltage Ranges
Tap Voltage Range
D 800 - 1449V
C 1450 - 2499V
B 2500 - 4799V
A 4800 - 7200V
A T T E N T I O N A T T E N T I O N Grounds must be reconnected on the voltage
sensing boards. Failure to do so may result in
injury, death or damage to equipment.