Rockwell Automation Publication 750-IN119A-EN-P - April 2022 77
Chapter 5 Power Wiring
Output Contactor
Precaution
Bypass Contactor
Precaution
Drive Power Jumper
Configuration
PowerFlex 755TS drives contain protective MOVs and common mode
capacitors that are referenced to ground. To guard against drive damage and/
or operation problems, these devices must be properly configured according to
Table 13
.
MOV, AC EMI Capacitor, and Common Mode Capacitor Circuits
Figure 45 - MOV and AC EMI Capacitor Phase to Ground
Figure 46 - Common Mode Capacitors to Ground
ATTENTION: To guard against drive damage when using output contactors,
the following information must be read and understood. One or more output
contactors can be installed between the drive and motor, or motors, to
disconnect or isolate certain motors/loads. If a contactor is opened while the
drive is operating, power is removed from the respective motor, but the drive
continues to produce voltage at the output terminals. In addition,
reconnecting a motor to an active drive (by closing the contactor) could
produce excessive current that can cause the drive to fault. If any of these
conditions are determined to be undesirable or unsafe, wire an auxiliary
contact on the output contactor to a drive digital input that is programmed as
“Enable.” This causes the drive to execute a coast-to-stop (cease output)
whenever an output contactor is opened.
ATTENTION: An incorrectly applied or installed bypass system can result in component
damage or reduction in product life. The most common causes are:
• Wiring AC line to drive output or control terminals.
• Improper bypass or output circuits that aren’t approved by Rockwell
Automation.
• Output circuits that do not connect directly to the motor.
Contact Rockwell Automation for assistance with application or wiring.
T/L3
R/L1
S/L2
PE-A
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