30 Rockwell Automation Publication 20A-IN009E-EN-P - January 2015
PowerFlex 70 Adjustable Frequency AC Drive
The PowerFlex 70 drive contains protective MOVs and common mode
capacitors that are referenced to ground (see below).
See Wiring and Grounding Guidelines for PWM AC Drives, publication
DRIVES-IN001
for information on ungrounded systems.
Table 14 - Recommended Power Jumper Configurations
To guard against unstable operation and/or damage, you must configure the
drive as shown in Table 14
on page 30.
All PowerFlex 70 240V, 480V, and 600V AC input drives are shipped with the DC
bus common mode capacitors referenced to ground. Specific drive catalog
numbers are listed below.
Power Source Type
(1)
(1) It is highly recommended to accurately determine the power source type and then configure appropriately.
MOV/Input
Filter Caps
(2)
(2) When MOVs are disconnected, the power system must have its own transient protection to ensure known and controlled voltages.
DC Bus Common
Mode Caps
Benefits of Correct
Configuration on Power
Source Type
Unknown Connected Disconnected See solid and non-solid ground
points below
Solid ground
• AC fed, solidly grounded
• DC fed from passive rectifier that
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 and brake
• DC fed from an active converter
Disconnected Disconnected Helps to avoid severe equipment
damage when a ground fault
occurs.
DC+
DC–
MOV and AC EMI Capacitor Phase to Ground
Common Mode Capacitor to Ground
Jumper Wire
Jumper Wire
Voltage Cat. No.
240 20AB…
480 20AD…
600 20AE…
To Next Page
Loading...
Need help?
General
