Rockwell Automation 25B PowerFlex 520-Series Adjustable Frequency AC Drive User Manual - Manual (Page 12)

12 Rockwell Automation Publication 520-UM001G-EN-E - September 2014
Preface Overview
General Precautions
ATTENTION: The drive contains high voltage capacitors which take time to
discharge after removal of mains supply. Before working on drive, ensure
isolation of mains supply from line inputs [R, S, T (L1, L2, L3)]. Wait three
minutes for capacitors to discharge to safe voltage levels. Failure to do so may
result in personal injury or death.
Darkened display LEDs is not an indication that capacitors have discharged to
safe voltage levels.
ATTENTION: Only qualified personnel familiar with adjustable frequency AC
drives and associated machinery should plan or implement the installation,
start-up and subsequent maintenance of the system. Failure to comply may
result in personal injury and/or equipment damage.
ATTENTION: 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 A-B 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: The bus regulator function is extremely useful for preventing
nuisance overvoltage faults resulting from aggressive decelerations,
overhauling loads, and eccentric loads. However, it can also cause either of the
following two conditions to occur.
1. Fast positive changes in input voltage or imbalanced input voltages can cause
uncommanded positive speed changes;
2. Actual deceleration times can be longer than commanded deceleration times
However, a “Stall Fault” is generated if the drive remains in this state for 1
minute. If this condition is unacceptable, the bus regulator must be disabled
(see parameter A550 [Bus Reg Enable]). In addition, installing a properly sized
dynamic brake resistor will provide equal or better performance in most cases.
ATTENTION: Risk of injury or equipment damage exists. Drive does not contain
user-serviceable components. Do not disassemble drive chassis.