Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive (A Frame) - ForGe Control - Manual (Page 65)

Rockwell Automation Publication 7000A-UM200C-EN-P - June 2014 65
Component Definition and Maintenance Chapter 3
PowerCage™ Overview A PowerCage is a converter module, consisting of the following elements:
• epoxy resin housing
• power semiconductors with gate driver circuit boards
• heatsinks
• clamp
• snubber resistors
• snubber capacitors
• sharing resistors (2400V drives do not have a sharing resistor)
Each drive consists of three PowerCage rectifier modules and three PowerCage
inverter modules.
AFE type rectifiers use SGCTs as semi-conductors.
All inverter modules use SGCTs as semi-conductors.
The size of the PowerCage will vary depending on the system voltage.
The power semi-conductor usage in the converter section is as follows:
Some PowerFlex 7000 configurations contain Self-Powered SGCT Power Supply
(SPS) boards. These boards are applicable on all “A” Frame drives and all AFE “B”
Frame drives with heat sinks. See
Self-Powered SGCT Power Supply - SPS on
page 90 for more information.
The inverter module is the module that contains the SGCT power device
necessary for producing the motor voltages and currents. There are three inverter
modules in each drive; the number of SGCTs per module depends on the voltage
rating of the motor. To understand a module, a description of a single SGCT and
its peripheral equipment is all that is required.
Configuration Rectifier SGCTs Inverter SGCTs
2400V, AFE 6 6
3300/4160V, AFE 12 12
6600V, AFE 18 18
ATTENTION: To prevent electrical shock, ensure the main power has been
disconnected before working on the converter cabinet. Verify that all circuits
are voltage free using a hot stick or appropriate voltage-measuring device.
Failure to do so may result in injury or death.
ATTENTION: The SGCT circuit board is sensitive to static charges. It is important
that these boards should not be handled without proper grounding.
ATTENTION: Some circuit boards can be destroyed by static charges. Use of
damaged circuit boards may also damage related components. A grounding
wrist strap is recommended for handling sensitive circuit boards.