78 Rockwell Automation Publication 750-IN119A-EN-P - April 2022
Chapter 5 Power Wiring
To connect or disconnect these devices, see the jumper locations that are
shown in Figure 47 on page 79
through Figure 53 on page 83.
In addition, on an ungrounded distribution system where the line-to-ground
voltages on any phase could exceed 125% of the nominal line-to-line voltage,
install an isolation transformer. See Wiring and Grounding Guidelines for
Pulse-width Modulated (PWM) AC Drives, publication DRIVES-IN001
, for
more information on impedance grounded and ungrounded systems.
ATTENTION: To avoid an electric shock hazard, verify that the voltage on the
bus capacitors has discharged completely before servicing.
Measure the DC bus voltage at the power terminal block by measuring
between the +DC and -DC terminals (see page 67
for location) or between the
+DC and -DC test point sockets if equipped. Also measure between the +DC
terminal or test point and the chassis, and between the -DC terminal or
testpoint and the chassis. The voltage must be zero for all three
measurements.
IMPORTANT PowerFlex 755TS drives leave the factory with jumpers PE-A and PE-B
connected. Reconfigure these jumpers based on the power source type
available.
Table 12 - Power Jumper Default Configuration
Cat. No. Position 11
Jumper PE-A
(MOV/Input filter caps)
Jumper PE-B
(DC bus common mode caps)
J Connected Connected
ATTENTION: Risk of equipment damage exists. The drive power source type
must be accurately determined. Jumpers PE-A and PE-B must be configured
for the power source type according to the recommendations in Table 49.
Table 13 - Recommended Power Jumper Configurations
Power Source Type
Jumper PE-A
(1)
(2)
(MOV/Input filter caps)
(1) When MOVs are disconnected, the power system must have its own transient protection to confirm known and controlled
voltages.
(2) Frame 5…7 common DC input drives do not have the PE-A jumper.
Jumper PE-B
(DC bus common mode
caps)
Benefits Of Correct Configuration
on Power Source Type
Non-Solid Ground or
Corner Ground
•AC fed ungrounded
• Impedance grounded
• B phase ground
•DC fed from a passive
rectifier
Disconnected Disconnected
Helps avoid severe equipment
damage when ground fault occurs
DC fed from an active
converter
Disconnected Disconnected
Helps avoid damage to filter
capacitors
Solid Ground
•AC fed solidly grounded
• DC fed from passive
rectifier that has a
solidly grounded AC
source
Connected Connected
• Reduced electrical noise
• Most stable operation
• EMC compliance
• Reduced voltage stress on
components and motor bearings
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