Powercage – Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control (PanelView 550) User Manual
Page 49
Rockwell Automation Publication 7000-UM151E-EN-P - January 2013
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Component Definition and Maintenance Chapter 3
PowerCage™
A PowerCage is a converter module, consisting of the following elements:
• epoxy resin housing
• power semi-conductors with gate driver circuit boards
• heatsinks
• clamp
• snubber resistors
• snubber capacitors
• sharing resistors
Each drive consists of three PowerCage rectifier modules and three PowerCage
inverter modules. There are three types of rectifiers:
• AFE and 18-pulse SCR.
• AFE type rectifiers use SGCTs as semiconductors.
• 18-pulse SCR rectifiers use SCRs as semiconductors.
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.
Configuration
Inverter SGCTs
Rectifier SGCTs
Rectifier SCRs
2300V, 18P
6
0
18
2300V, AFE
6
6
0
3300/4160V, 18P
12
0
18
3300/4160V, AFE
12
12
0
6600V, 18P
18
0
18
6600V, AFE
18
18
0
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.