Publication 20A-IN009C-EN-P
22 PowerFlex® 70 Adjustable Frequency AC Drive Installation Instructions
Table I Recommended Power Jumper Configurations
To connect or disconnect these devices, refer to pages 23 through 26.
Important: Common mode capacitors are required to conform with the
EMC directive. Removing these devices will withdraw the
associated directive.
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 PWM AC Drives, publication
DRIVES-IN001 for more information on impedance grounded and
ungrounded systems.
Jumper Installation, Removal and Storage
PowerFlex 70 drives utilize plug-in style jumpers. Most drives will have
a jumper storage area inside the front cover. Extra jumpers or jumpers
that have been removed should be stored in this location for use at a later
time.
Power Source Type
(1)
MOV/Input
Filter Caps
(2)
DC Bus
Common
Mode Caps
Benefits Of Correct
Configuration on Power
Source Type
Unknown Connected Disconnected See Solid & Non-Solid Ground
points below
Solid Ground
• AC fed, solidly grounded
• DC fed from passive rectifier
which has an AC source and
solid ground
Connected Connected • UL compliance,
• Reduced electrical noise,
• Most stable operation,
• EMC compliance,
• Reduced voltage stress on
components and motor
bearings
Non-Solid Ground
• AC fed ungrounded
• Impedance grounded
• High resistive ground
• B phase ground
• Regenerative unit such as
common DC bus supply & brake
• DC fed from an active converter
Disconnected Disconnected • Helps avoid severe
equipment damage when
ground 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 ensure
known and controlled voltages.
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