Allen-Bradley External Dynamic Brake Resistor Recommended Protection Installation Instructions

Allen-Bradley External Dynamic Brake Resistor Recommended Protection ensures safe operation of externally mounted brake resistors. This device safeguards against fire hazards caused by overheating, by providing a protective circuit or an equivalent system. External resistor packages must either have self-protection against overtemperature or require the use of this protective circuit. The circuit features a thermostat that monitors the temperature of the resistors and, if necessary, triggers a power-off mechanism to prevent overheating.

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Installation Instructions
External Dynamic Brake Resistor Recommended Protection
!
ATTENTION: AC drives do not offer protection for externally mounted
brake resistors. A risk of fire exists if external braking resistors are not
protected. External resistor packages must be self-protected from
overtemperature or the protective circuit shown below, or equivalent,
must be supplied.
External Brake Resistor Circuitry
Three-Phase
AC Input
AC Drive
(Input Contactor) M
R (L1)
S (L2)
T (L3)
Power Off
Power On
M
M
Power Source
DB Resistor Thermostat
This document, as well as more information about Reliance Electric products, can be
found at www.reliance.com/drives.
Publication D2-3515 - July 2002
Copyright  2002 Rockwell Automation. All rights reserved. Printed in USA.
U.S. Drives Technical Support
Tel: (1) 262.512.8176, Fax: (1) 262.512.2222, Email: [email protected], Online: www.ab.com/support/abdrives
Trademarks not belonging to Rockwell Automation are property of their respective companies.
Publication D2-3515-July 2002
Copyright &copy; 2002 Rockwell Automation, Inc. All Rights Reserved. Printed in USA.
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Key features

Overheat protection
Thermostat monitoring
Power-off mechanism
Three-phase AC input
External brake resistor support

Frequently asked questions

External brake resistors pose a fire risk if they overheat without protection. The Allen-Bradley External Dynamic Brake Resistor Recommended Protection is designed to address this issue by providing a protective circuit that monitors temperature and shuts off power if necessary.

The circuit includes a thermostat, a three-phase AC input, and a power-off mechanism. The thermostat monitors the temperature of the external brake resistors, and if the temperature exceeds a safe limit, it triggers the power-off mechanism to prevent overheating.

The power-off mechanism disconnects the power supply to the brake resistors when the thermostat detects an unsafe temperature. This effectively prevents further heating and potential fire hazards.