Rockwell Automation 20B PowerFlex 700 Installation Instructions - Frames 0…6 - Manual (Page 6)

6 Rockwell Automation Publication 20B-IN019E-EN-P - July 2013
PowerFlex 700 Adjustable Frequency AC Drive – Frames 0…6
Product Safety
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 can result in malfunction of the system.
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 can result if ESD
control procedures are not followed. If you are not familiar with static control
procedures, reference Guarding Against Electrostatic Damage, publication
8000-4.5.2 or any other applicable ESD protection handbook.
ATTENTION: The “adjust freq” portion of the bus regulator function is
extremely useful for preventing nuisance overvoltage faults resulting from
aggressive decelerations, overhauling loads, and eccentric loads. It forces the
output frequency to be greater than commanded frequency, while the bus
voltage is increasing toward a level that causes a fault. However, it can also
cause either of the following two conditions to occur.
• Fast positive changes in input voltage (more than a 10% increase within 6
minutes) can cause uncommanded positive speed changes. However an
“OverSpeed Limit” fault (F25) occurs if the speed reaches [Maximum Speed] +
[Overspeed Limit], (parameters 82 and 83). If this condition is unacceptable,
action must be taken to 1) limit supply voltages within the specification of the
drive and, 2) limit fast positive input voltage changes to less than 10%.
Without taking such actions, if this operation is unacceptable, the “adjust freq”
portion of the bus regulator function must be disabled (see parameters 161
and 162).
• Actual deceleration times can be longer than commanded deceleration times.
However, a “Decel Inhibit” fault (F24) is generated if the drive stops
decelerating altogether. If this condition is unacceptable, the “adjust freq”
portion of the bus regulator must be disabled (see parameters 161 and 162). In
addition, installing a properly sized dynamic brake resistor provides equal or
better performance in most cases.
Important: These faults are not instantaneous. Test results have shown that they
can take between 2…12 seconds to occur.