PowerFlex 750-Series AC Drives User Manual

1-24 Installation/Wiring!!ATTENTION: PE-A and PE-B jumpers must be configuredaccording to the recommendations in Table 1.J.ATTENTION: To avoid an electric shock hazard, verify that thevoltage on the bus capacitors has discharged completely beforeremoving/installing jumpers. Check the DC bus voltage at thePower Terminal Block by measuring between the +DC and -DCterminals (refer to Figure 1.8 and Figure 1.9 for location),between the +DC terminal and the chassis, and between the -DCterminal and the chassis. The voltage must be zero for all threemeasurements.Table 1.J Recommended Power Jumper ConfigurationsDC BusCommonMode CapsDefaultConfiguration(Cat. No.MOV / InputFilter CapsPower Source Type (1) (PE-A) (2) (PE-B) Position 11)Unknown Connected Disconnected A See below.• AC fed SolidlyGrounded• DC fed from passiverectifier which has aSolidly Grounded ACsource• AC fed Ungrounded• Impedance Grounded• DC fed from an activeconverterBenefits Of CorrectConfiguration on PowerSource TypeConnected Connected J UL compliance,Reduced electrical noise,Most stable operation,EMC compliance,Reduced voltage stresson components andmotor bearingsDisconnected Disconnected N/A Helps avoid severeequipment damage whenground fault occurs(1) It is highly recommended to accurately determine the power source type and then configure appropriately.(2) When MOVs are disconnected, the power system must have its own transient protection to insure known andcontrolled voltages.To connect or disconnect these devices, refer to the jumper locations shownin Figure 1.15, Figure 1.16 and Figure 1.17.In addition, on an ungrounded distribution system where the line-to-groundvoltages on any phase could exceed 125% of the nominal line-to-linevoltage, an isolation transformer should be installed. See Wiring andGrounding Guidelines for Pulse Width Modulated (PWM) AC Drives,publication DRIVES-IN001 at www.rockwellautomation.com/literature formore information on impedance grounded and ungrounded systems.PowerFlex 750-Series User Manual – Publication 750-UM001C-EN-P – September 2009