A-BPowerFlex 7000 Medium Voltage AC Drive Air-Cooled (’B’ Frame)—ForGe Control

insulation is the rated motor RMS voltage divided by 0.707. 

Reflected wave and dv/dt issues often associated with VSI drives are a nonissue with the drive. Figure 5 shows typical motor waveforms. The drive uses a 

SHE pattern in the inverter to eliminate major order harmonics, plus a small 

output capacitor (integral to the drive) to eliminate harmonics at higher 

speeds.

Standard motors are compatible without de-rating, even on retrofit 

applications. 

Motor cable distance is virtually unlimited. Rockwell Automation has tested 

this technology for controlling motors up to 15 km (9.3 mi) away from the drive.

Figure 5 - Motor Waveforms at Full Load, Full Speed

Power Component Definition and Maintenance

This section provides an overview of the control components and cabling of 

your PowerFlex® 7000 ‘B’ frame drive. This section also details a number of 

regular or recurring maintenance tasks that will keep your drive in peak 

operating condition.

Figure 20 through Figure 26 identify the control components and cabling of 

your drives. Where appropriate, separate diagrams and instructions are 

available for both the heatsink and the heatpipe ‘B’ frame models. 

For information regarding power wiring and cabling connections (as might be 

necessary for routine maintenance), see the PowerFlex 7000 ‘B’ frame 

installation manual, publication 7000-IN007.

Control Power Off Tests Perform the following checks before applying control power to the drive. 

Rockwell Automation recommends that you complete these checks in the 

sequence they are presented here.

Interlocking

When the input contactor option is purchased, a key interlock is provided to 

prevent access to the medium voltage compartments of the drive unless the 

input isolation switch is locked in the open position.

Where the input switching device is provided by others, Rockwell Automation 

will provide a key interlock on the medium voltage compartment of the drive, 

and a matching interlock for installation by others on the upstream device. The 

interlock shall be installed in a manner that ensures the power to the drive is 

off and the drive is electrically isolated whenever the key is freed.

Although key interlocks shipped with all medium voltage equipment are 

aligned in the factory, they often move out of position during shipping or are 

often misaligned when the cabinet is set down on an uneven floor. 

ATTENTION: Servicing energized industrial control equipment can be 

hazardous. Severe injury or death can result from electrical shock, 

burn, or unintended actuation of control equipment. Hazardous 

voltages can exist in the cabinet even with the circuit breaker in the 

off position. We recommend that you disconnect or lock out control 

equipment from power sources, and confirm discharge of stored 

energy in capacitors. If you must work in the vicinity of energized 

equipment, the safety-related work practices of NFPA 70E, Standard 

for Electrical Safety in the Workplace, must be followed