Rockwell Automation 1336_F_E_T_S SERIES A CHOPPER BRAKE MODULE - Manual (Page 12)

Heavy Duty Dynamic Braking 12
1336-5.65 — March, 2007
Minimum Dynamic Brake Resistance = V
d
/I
d2
= 10 ohms = R
db2
This is the result of Step 6 and is also included as a value in Table 2b.
Choose the 10.4 ohms resistor, type T10F4R2K97, rated at 2.97 kW from
Table 2a.
Average Power Dissipation = [(t
3
- t
2
)/t
4
]P
b
/2 = 2.8 kW = P
av
This is the result of calculating the average power dissipation as outlined
in Step 8. Verify that the power rating of the Dynamic Brake Resistor chosen
in Step 7 is greater than the value calculated in Step 8. Note that the actual
resistor wattage rating is much greater than what is needed. The type
T10F4R2K97 assembly is the best choice based on resistance and wattage
values.
Ordering Resistors Resistor assemblies listed are manufactured by IPC Power Resistors
International Incorporated and Powerohm Resistors Incorporated and have
been tested with Allen-Bradley Chopper Modules.
Available resistor assembly options include an overtemperature switch (see
Wiring Schemes), auxiliary terminal blocks and custom enclosures.
For purchase information, contact:
IPC Power Resistors International Inc.
167 Gap Way
Erlanger, KY 41018
Tel. 859-282-2900 Fax. (859) 282-2904
www.ipcresistors.com
Powerohm Resistors Inc.
5713 13th Street
Katy, TX 77493
Tel. 800-838-4694 Fax. (859) 384-8099
www.powerohm.com