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Drive Selection Considerations

Selecting a PowerFlex to use as a replacement in a 160 SSC application needs to take into account some of the differences and features between the PowerFlex 4M, 4, and 40. Listed here are some of the major differences in the PowerFlex 4-Class compared to the 160 SSC. The next section has an in-depth comparison of the PowerFlex 4-Class.

Feed through wiring

The 160 SSC has feed through wiring. The line is connected to the top of the drive and motor is connected to the bottom of the drive. The PowerFlex 4M has feed through wiring. The PowerFlex

4 and 40 terminate the line and motor to the bottom of the drive.

DeviceNet

The 160 SSC could have an optional 160-DNx DeviceNet communication module. This enables the 160 SSC to be controlled and monitored on DeviceNet. The PowerFlex 40 accepts an optional 22COMM-D DeviceNet communication module mounted directly in the drive. For the

PowerFlex 4 and 4M to communicate on DeviceNet, a 22COMM-D module is mounted in an external 22XCOMM module and connected to the drives DSI port.

The 160 SSC has configurable Input and Output Assemblies for DeviceNet control of drive. The

PowerFlex has fixed Input and Output Assemblies. Logic changes may have to be made to control the PowerFlex in the same manner.

Speed Presets

The 160 SSC Preset Speed model has eight preset speeds set by three digital inputs. The

PowerFlex 40 has eight preset speeds and the PowerFlex 4 and 4M have four preset speeds.

Sensorless Vector Control

The 160 SSC is a Volts per Hertz drive with adjustments for Boost and Slip Compensation. The

PowerFlex 4 and 4M are Volts per Hertz drives as well. The PowerFlex 40 by default is in

Sensorless Vector control, which achieves a higher level of torque response and speed accuracy.

The PowerFlex 40 can be changed to Volts per Hertz control if need be.

Bipolar Speed Reference

The 160 SSC can accept a Bipolar (+/-10VDC) speed reference. The direction is set by the polarity of the speed reference. This feature is available on the PowerFlex 40 but not the

PowerFlex 4 and 4M.

Circuit Protection

When selecting a PowerFlex replacement for a 160 SSC, pay attention to the recommendations for fusing and circuit breakers. Protective device sizing may be different between equivalent 160

SSC and PowerFlex drives.

More information on the PowerFlex fuse and circuit breaker recommended sizes in the following publications at:

http://literature.rockwellautomation.com

22A-UM001

22B-UM001

PowerFlex 4 User Manual

PowerFlex 40 User Manual

22F-UM001

PowerFlex 4M User Manual

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