Rockwell Automation Powerflex Proposal works link
Configurator for recommended dynamic brake
resistors ( including former IPC Resistor ) for Allen-Bradley PowerFlex Drives. You'll be able to enter the
catalog number or build the catalog number by making attribute selections, and
view resistor selection data, options and information.
Rockwell Automation 1336 Proposal works link
Configurator for recommended brake
resistors for Allen-Bradley 1336 Drives. You'll be able to enter the catalog
number or build the catalog number by making attribute selections, and view
resistor selection data, options and information.
Same Day Shipment for Allen-Bradley
Powerflex and 1336 Drive Standard
Dynamic Braking Resistors! Up to 20 KW
In by 10 Out by 3 Guaranteed!
Being first a manufacturer of power resistors, Post Glover
has a vast
array of Dynamic Braking Resistors to choose from. This
allows us to
offer the best possible technical and economic solution for
your
particular application. We are an original Encompass partner
to
Rockwell Automation and have built a broad knowledge of
their product
specifications for dynamic braking resistors, so when you
call in
requesting a part, Post Glover can quote the needed part
fast. Post
Glover will ship Rockwell Automation Dynamic Braking
resistors up to 20
kW same-day at no additional charge. You can rely on the
industry's
most innovative resistor manufacturer with over 100 years of
industry
experience. How Post Glover Makes Your Life a Little Simpler
We make buying resistors easy for our customers by striving to be the
leader in cost and customer service. The Rockwell Automation Proposal
works links use the following steps to specify the correct dynamic
braking resistor for your application.
Just a few basic details are needed to properly size your DBR:
- Ohms
- Watts
- Duty cycle (time on/time off)
Ohms are determined by the drive and are usually stated as a range or
minimum.
Watts are stated as either a maximum braking power or continuous
braking power. In either case, the wattage rating of the resistor is
calculated by the braking cycle. Braking cycle is usually stated as a percentage; however, the actual
times on and off can be used to offer the optional resistor package
while minimizing size and cost. Example
An application requires a braking resistor rated 25 ohms with an
average power during braking of 2500 Watts. The duty cycle is 20% - 10
seconds on and 40 seconds off - with a cycle time of 50 seconds.
The ohmic value of the resistor is typically between -0% and +5% -
therefore, 25.0-26.25 ohms. Dynamic Braking Resistor Element Types
- Smoothwound Resistor Element
- Ohms: 1.7 to 1500
- Watts: up to 1100
- Used primarily for dynamic braking
- Adjustable rating resistor
- Wirewound Resistor Element
- Ohms: 0.5 to 300
- Watts: up to 400
- Used primarily for dynamic braking
- High ohmage handling in a smaller space
- Edgewound Resistor Element
- Ohms: 0.05 to 9.0
- Watts: up to 1850
- Used for all applications
- High amperage handling in a smaller space
- Spiralwound Resistor Element
- Ohms: 1 to 34.9
- Watts: up to 1250
- Low cost Dynamic Braking element uses 50% less wire than Wirewound
design
- Fast cooling due to "paperclip" design
Only With Post Glover Do You Get All These Features and Options.
- Standard Nema 1 Enclosure Design
- Thermal overloads
- Two Point terminal block
- Factory Tested
- Convenient Conduit Knockouts
- Options: Powder Coated, Nema 3R, Stainless Steel
How Dynamic Braking Resistors Work
State of the art AC Variable Frequency Drives (VFD) are commonplace
today, creating the need for reliable, proven Dynamic Braking Resistors
that can be delivered quickly, completely assembled, and ready for
convenient installation at the job-site. Dynamic Braking Resistors are
used with AC VFD's to produce a braking torque in the motor during
overhauling conditions. The dynamic braking resistor is connected
across the DC bus and will see voltages as high as 800 volts.
The Rockwell Automation drive normally determines the power rating
(watts) needed to prevent overheating during braking duty. The peak
braking current is determined by the specified resistance value. Each
drive specifies a resistance range with a minimum to prevent
overcurrent and damage to the drive and a maximum value to give
adequate lower dissipation capability.
A three-phase variable frequency drive (VFD) consists of three basic
components - rectifier, DC line, and inverter - and a control system to
manage these three components as illustrated. The rectifier converts
the three-phase 60Hz AC input to a DC signal.
Depending on the system, an inductor, a capacitor, or combination of
these components smoothes the DC signal (reduces voltage ripple) in the
DC link part of the VFD. The inverter circuit converts the DC signal
into a variable frequency AC voltage to control the speed of the
induction motor.
During braking, the VFD ramps the frequency to zero. The rotational
energy of the motor and load are driven back through the inverter to
the DC bus.
More Information
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Standard features:
- Mill galvanized enclosure
- Nema 1
- Temperature switch
- Edgewound or
Wirewound Elements
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