Motor Start/Stop Precautions; Mounting - Allen-Bradley PowerFlex 70 Reference Manual

Motor Start/Stop
Precautions

Mounting

Input Contactor Precautions
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.
Output Contactor Precaution
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.
Refer to the Chapter 1 of the correct drive User Manual for mounting
instructions and limitations. As a general rule, drives should be mounted on
a metallic flat surface in the vertical orientation. If other orientations are
being considered, contact the factory for additional data.

Motor Start/Stop Precautions

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