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Rockwell Automation Publication 35-UM001A-EN-P - May 2022
Chapter 7 Configure the Armor PowerFlex Drive
Figure 79 - DC Brake Example
Configure Dynamic Brake
Choose a Resistor option that matches the physical Dynamic Brake connected
to the Armor PowerFlex. When the External Light Duty or External Normal
duty options are selected, the dynamic brake feature is enabled. Then, set the
DC Bus Threshold Voltage.
ATTENTION:
If a hazard of injury due to movement of equipment
or material exists, a mechanical braking device must be used.
This feature must not be used with synchronous or permanent
magnet motors. Motors can be demagnetized during braking.
ATTENTION:
Excess motor current and/or applied duration,
could cause motor damage. Motor voltage can exist long after
the Stop command is issued. The right combination of DC
Brake Level and DC Brake Time must be determined to provide
the safest, most efficient stop.
IMPORTANT
Stop the drive before changing this setting.
Value
Description
Dynamic Brake
Resistor
Not Specified
Not used; no dynamic brake
External Light Duty
3% duty cycle, for details see
Light Duty Dynamic Brake Resistor
External Normal Duty
5% duty cycle, for details see
Standard Duty Dynamic Brake Resistor
DC Bus Voltage
Threshold
77…850V DC
If the DC bus voltage falls below the value set in this parameter, the
Dynamic Brake does not turn on. Lower values make the Dynamic Braking
function more responsive, but can result in nuisance Dynamic Brake
activation.
ATTENTION:
Equipment damage can result if this
parameter is set to a value that causes the dynamic
braking resistor to dissipate excessive power.
Parameter settings less than 770V DC should be
carefully evaluated to confirm that the dynamic brake
resistor’s wattage rating is not exceeded. In general,
values less than 700V DC are not needed.
Do not set the parameter above 810V DC because it will
cause a DC Bus Overvoltage error.
Time
[DC Brake Level]
[DC Brake Time]
Stop Command
Speed
Voltage
V
olts Speed
[DC Brake Level]
[DC Brake Time]
Time
Voltage
Speed
Stop Command
V
olts Speed
DC Injection Braking Mode
Ramp-to-Stop Mode
}
}
}
}
Содержание Allen-Bradley 35E
Страница 10: ...10 Rockwell Automation Publication 35 UM001A EN P May 2022 Table of Contents Index 223 ...
Страница 222: ...222 Rockwell Automation Publication 35 UM001A EN P May 2022 Appendix B Configure a Message Instruction Notes ...
Страница 225: ...Rockwell Automation Publication 35 UM001A EN P May 2022 225 Armor PowerFlex AC Drives User Manual ...