Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive - Air-Cooled (A Frame) - Manual (Page 250)

5-8
Component Definition and Maintenance
7000A-RM001A-EN-P – January 2011 7000 “A” Frame
Converter Cabinet The converter cabinet contains three rectifier modules and three inverter
modules. Figure 5.7 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 control logic. 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 ACB 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 5.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.