14 Rockwell Automation Publication 22-TD001I-EN-P - June 2013
PowerFlex 4 and 40 AC Drives
Installation Considerations
PowerFlex 4 and 40 drives have the following built in protective features to help simplify installation.
• Ground fault protection while starting and running ensures reliable operation
• Electronic motor overload protection increases motor life
• Removable MOV to ground ensures compatibility with ungrounded systems
• 6kV transient protection provides increased robustness for 380…480V system voltages
There are many other factors that must be considered for optimal performance in any given application. The block diagram
below highlights the primary installation considerations. Consult the PowerFlex 4 or PowerFlex 40 User Manual,
Publications 22A-UM001 or 22B-UM001 available online at www.rockwellautomation.com/literature
, for detailed
recommendations on input power conditioning, CE conformance (EMC filtering), dynamic braking, reflected wave
protection, motor cable types and motor cable distances.
Block Diagram
Branch Circuit Protective Devices – See Specifications on page 19
Class 10 Overload Protection – Provided by the PowerFlex drive
Line (EMC) Filter – See page 13
Motor – See publication MOTORS-CA001
Motor Cable Type and Length Recommendations –
(Consult the appropriate User Manual)
Integral Keypad
Input Power Conditioning – See Line Reactors on page 12
Reflected Wave Protection – (Consult the appropriate User Manual)
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