Powercage™ overview – Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control User Manual
Page 55
Rockwell Automation Publication 7000-UM202B-EN-P - June 2014
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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
•
heat sinks or heat pipes
•
clamp
•
snubber resistors
•
snubber capacitors
•
sharing resistors (not applicable for 2400V models)
Each drive consists of three PowerCage rectifier modules and three PowerCage
inverter modules. There are two principal classes of rectifiers:
•
AFE and 18 Pulse
–
AFE type rectifiers use SGCTs
–
18 Pulse rectifiers use SCRs
All inverter modules use SGCTs as semiconductors.
The size of the PowerCage depends on the system voltage, and the components
will also vary in the system current.
This table illustrates power semiconductor usage in the converter section.
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
for more information
Configuration
Rectifier SGCTs
Rectifier SCRs
Inverter SGCTs
2400V, AFE
6
0
6
2400V, 18 Pulse
0
18
6
3300/4160V, AFE
12
0
12
3300/4160V, 18 Pulse
0
18
12
6600V, AFE
18
0
18
6600V, 18 Pulse
0
18
18
ATTENTION: To prevent electrical shock, disconnect the main power before
working on the drive. 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 PowerCage can house either SCRs or Symmetrical Gate
Commutated Thyristors (SGCT). The SGCT circuit board is sensitive to static
charges. Never handle these boards without proper grounding.
ATTENTION: Some circuit boards can be destroyed by static charges. Use of
damaged circuit boards may also damage related components. Use a grounding
wrist strap when handling sensitive circuit boards.
ATTENTION: If equipped, the SPS circuit board is sensitive to static charges. Do
not handle these boards without proper grounding.