Rockwell Automation Publication 22C-UM001J-EN-E - January 2017 9
Preface
General Precautions
ATTENTION: To avoid an electric shock hazard, verify that the voltage on the
bus capacitors has discharged before performing any work on the drive.
Measure the DC bus voltage at the –DC and +DC terminals or at the –DC and
P2 terminals on the Power Terminal Block (refer to Chapter 1
Power Terminal
descriptions). The voltage must be zero.
A darkened LCD display and 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 A187
).
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