10 Rockwell Automation Publication 7000-UM202H-EN-P - November 2023
Preface
General Precautions
This drive contains ESD (electrostatic discharge) sensitive parts and
assemblies. Static control precautions are required when installing, testing,
servicing or repairing this assembly. Component damage may result if ESD
control procedures are not followed. If you are not familiar with static control
procedures, reference Allen-Bradley publication 8000-4.5.2
, “Guarding Against
Electrostatic Damage” or any other applicable ESD protection handbook.
ATTENTION: An incorrectly applied or installed drive can result in component
damage or a reduction in product life. Wiring or application errors, such as,
undersizing the motor, incorrect or inadequate AC supply, or excessive
ambient temperatures may result in malfunction of the system.
ATTENTION: Only personnel familiar with the PowerFlex 7000 Variable
Frequency Drive (VFD) or Adjustable Speed Drive (ASD) and associated
machinery should plan or implement the installation, startup, and subsequent
maintenance of the system. Failure to comply may result in personal injury
and/or equipment damage.
ATTENTION: It is not recommended to repeatedly energize transformers.
Transformer energization results in high inrush current (10…15 times the rated
transformer current). Energizing a transformer multiple times in a short
period of time, may subject the transformer windings and winding insulation
to destructive thermal and electromechanical stress, due to the repetitive
high inrush current. This energization limitation is similar to limiting the
number of motor starts per hour to reduce thermal stress on a motor. The
typical inrush current for a motor is much lower (six times the motor full-load
current) making the energization limitation for an isolation transformer even
more important.
For applications where the motor must be started frequently, PowerFlex
medium voltage drives should be left in the 'Drive Ready' mode. The input
contactor/breaker remains closed in this mode (that is, medium voltage
remains present on the transformer) and the drive will start, run, and stop the
motor when required, without the need to energize and de-energize the drive
isolation transformer.
ATTENTION: To keep arc resistant structural integrity, if applicable, the
following rules must be followed:
• The pressure relief vent may not be tampered with, and it is not to be used as
a step.
• No unapproved alterations can be made to the enclosure.
• All covers, plates, and hardware removed for installation or maintenance
purposes must be re-installed and properly secured. Failure to do so voids the
arc resistant structural integrity.
• Power cable entry points are to be treated as the boundary to a hazardous
location and must be sealed accordingly. Failure to do so voids the arc
resistant structural integrity.
• A plenum or chimney must be used to direct the arc flash energy to a suitable
location. Failure to do so voids the arc resistant structural integrity. See
publication 7000-IN007
.
• All wiring between the low voltage panel and the power cell must be routed
through a suitable cable gland to ensure flames and gases are not transmitted
into this area (as fitted from factory).
• The medium voltage doors must be properly secured using the handle
mechanism (if provided), the key interlock (if provided), and the door bolts.
Failure to do so voids the arc resistant structural integrity.
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