Rockwell Automation Publication 7000L-UM301F-EN-P - March 2020 289
Component Definition and Maintenance Chapter 5
Converter Cabinet
The converter cabinet contains three rectifier modules and three inverter
modules. Figure 236
shows a 4160-volt converter with a Pulse Width
Modulation Rectifier (PWMR).
Isolated Gate Driver Power Supplies (IGDPS) are mounted on the cabinet’s right
side sheet.
Cooling pipes are throughout the cabinet and are connected to each chill block.
Unlike the air-cooled drive, thermal sensors are not installed on the chill block.
The thermal sensor is located in the pump cabinet.
PowerCage Assembly
A PowerCageâ„¢ assembly is a Rockwell Automation patented converter module,
consisting of the following elements:
• Epoxy resin housing
• Power semi-conductors with gate driver circuit boards
• Chill blocks
• Clamp
• Snubber resistors
• Snubber capacitors
• Sharing resistors
• Piping for coolant to flow to each chill block
All drives have six PowerCages, three rectifiers and three inverter modules. The
liquid-cooled drive has two types of rectifiers – the 18 Pulse SCR and the PWM
rectifier.
All inverter modules use SGCTs as semi-conductors.
The size of the PowerCage will vary depending on the system voltage, and the
components will also vary depending on the system current.
All PWMR modules use SGCTs as semi-conductors.
The power semi-conductor usage in the converter section is as follows:
Configuration Inverter SGCTs Rectifier SGCTs Rectifier SCRs
3300/4160V PWM rectifier 12 12 0
3300/4160V, 18 Pulse 12 0 18
6600V, 18 Pulse 18 0 18
6600V, PWM rectifier 18 18 0
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.
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