Rockwell Automation Publication 750-IN001O-EN-P - October 2014 211
Power Wiring Chapter 4
Table 30 - Recommended Power Jumper Configurations Floor Mount Frames 8…10
To connect or disconnect these devices, refer to the jumper locations shown in
the figures on pages 212
through 217.
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, an
isolation transformer should be installed. See Wiring and Grounding Guidelines
for Pulse Width Modulated (PWM) AC Drives, publication DRIVES-IN001
at
www.rockwellautomation.com/literature
for more information on impedance
grounded and ungrounded systems.
Power Source Type Jumper PE-A1
(1)
(MOV)
Jumper PE-A2
(Input Filter Caps)
Jumper PE-B
(DC Bus Common
mode Caps)
Benefits Of Correct
Configuration on Power
Source Type
Non-Solid Ground
• AC fed ungrounded
• Impedance grounded
• B phase ground
• DC fed from an active converter
Disconnected Disconnected Disconnected Helps avoid severe equipment
damage when ground fault
occurs
Solid Ground
• AC fed solidly grounded
• DC fed from passive rectifier
which has a solidly grounded AC
source
Connected Connected Connected UL compliance, Reduced
electrical noise, Most stable
operation, EMC compliance,
Reduced voltage stress on
components and motor bearings
(1) When MOVs are disconnected, the power system must have its own transient protection to ensure known and controlled voltages.
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