Powerohm Braking Resistors
Application Information:
AC variable frequency drives are commonly used with a
general purpose AC induction motor to form a reliable
variable speed drive system. For applications that
require faster deceleration rates, or where motor speeds
are exceeding the synchronous speed set by the output
frequency of the drive ( anoverhauling load condition), a
braking resistor is required. Braking resistors increase
the braking torque capability of a variable frequency drive,
producing faster and more controlled braking. The
resistor dissipates regenerated power to keep the bus
voltage from exceeding the rated limit of the drive.
Construction:
Standard units include resistors installed in a screened enclosure with a galvanized finish. Units are furnished with resistors wired to a terminal block with
high temperature silicone or teflon wire. Refer to the Enclosure Section of the catalog for enclosure details and finish
options.
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CAUTION: It is very important to insure that the resistance
listed in the chart below is greater than the minimum specified
for your drive or braking module. Installing a braking resistor
with too low of a resistance value will cause permanent
damage to your drive or braking module. Please call the
factory if you need assistance.
Resistance Tolerance: +/- 10%
| Braking Resistors for 230 V Drives |
| 100% Braking Torque (Duty Based on Overhauling Load Cycle) |
| Braking Resistors for 230 V Drives |
| 150% Braking Torque (Duty Based on Overhauling Load Cycle) |
| Braking Resistors for 460 V Drives |
| 100% Braking Torque (Duty Based on Overhauling Load Cycle) |
| Braking Resistors for 460 V Drives |
| 150% Braking Torque (Duty Based on Overhauling Load Cycle) |
| Braking Resistors for 575 V Drives |
| 100% Braking Torque (Duty Based on Overhauling Load Cycle) |
| Braking Resistors for 575 V Drives |
| 150% Braking Torque (Duty Based on Overhauling Load Cycle) |