8 Brake resistors
8.1 General
During braking with the aid of the motor, energy is fed back into the servo amplifier. This
regenerative energy is dissipated as heat in the brake resistor. The brake resistor is switched
on by the brake circuit. Different resistance values have to be used depending on the servo
amplifier. All resistors meet the requirements of CE directives and are UL-registered.
Hints for calculation of the brake power can be found in our Product WIKI on page "Cal-
culation of brake power", more information to the resistors are given on WIKI page "Brake
Resistors".
8.2 Important notes
WARNING
The brake resistor surface temperature can exceed 250°C. Risk of burns!
Measure the temperature and wait until temperature dropped down below
40°C, before touching the resistor housing.
Inadequate levels of cooling air or incorrect installation can lead to overheating and destruc-
tion of the resistor and surrounding components.
l May only be installed in switchgear cabinets, comply with the permissible installation
types and clearances (see dimensional drawing).
l Ensure there is unobstructed convection for cooling purposes.
l Use temperature-resistant materials in the vicinity of the resistor.
l The connection terminals must never be located within the flow range of the heated waste
air.
The following requirements must be met to ensure the brake resistors work properly:
l Compliance with required installation clearances
l Compliance with permissible installation type
l Unhindered access of cooling air
l Unhindered diverting of warmed up air
l Rated data with maximum ambient temperature 40°C, in case of ambient temperature
higher than 40°C, power must be reduced by 4% per 10K temperature rise
You must read the instructions manual for the servo amplifier/servo motor you are using in
your application and observe the safety instructions they contain before commencing mount-
ing/installation work.
A connection diagram appears in the servo amplifier's instructions manual.
Accessories Europe | 8 Brake resistors
Kollmorgen | December 2014 33
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