Rockwell Automation 20L PowerFlex 700L Frame 1X Liquid-Cooled Adjustable Frequency AC Drive - Manual (Page 21)

PowerFlex 700L Frame 1X Drive Installation Instructions – Publication 20L-IN013A-EN-P – June 2009
21
Input Contactor Precautions
Output Contactor Precaution
Bypass Contactor Precaution
Using Input/Output Contactors
!
ATTENTION: A contactor or other device that routinely
disconnects and reapplies the AC line to the drive to start and
stop the motor can cause drive hardware damage. The drive is
designed to use control input signals that will start and stop the
motor. If an input device is used, operation must not exceed one
cycle per minute or drive damage will occur.
!
ATTENTION: The drive start/stop/enable control circuitry
includes solid state components. If hazards due to accidental
contact with moving machinery or unintentional flow of liquid,
gas or solids exist, an additional hardwired stop circuit may be
required to remove the AC line to the drive. An auxiliary braking
method may be required.
!
ATTENTION: To guard against drive damage when using
output contactors, the following information must be read and
understood. One or more output contactors may be installed
between the drive and motor(s) for the purpose of disconnecting
or isolating certain motors/loads. If a contactor is opened while
the drive is operating, power will be removed from the respective
motor, but the drive will continue 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 may cause the drive to fault. If any of these conditions are
determined to be undesirable or unsafe, an auxiliary contact on
the output contactor should be wired to a drive digital input that
is programmed as “Enable.” This will cause 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 not approved by
Allen-Bradley.
•
Output circuits which do not connect directly to the motor.
Contact Allen-Bradley for assistance with application or wiring.