SLX9000 Adjustable Frequency Drives User Manual
MN04003020E
For more information visit: www.eaton.com 9-17
January 2009
2.4.2 Brake chopper ID504
Note: An internal brake chopper is installed.
0 No brake chopper used
1 Brake chopper used in Run state
3 Used in Run and Stop state
When the drive is decelerating the motor, the inertia of the motor and the load are
fed into an external brake resistor. This enables the drive to decelerate the load with
a torque equal to that of acceleration (provided that the correct brake resistor has
been selected). See separate Brake resistor installation manual.
2.4.3 DC-braking current ID507
Defines the current injected into the motor during DC-braking.
2.4.4 DC-braking time at stop ID508
Determines if braking is ON or OFF and the braking time of the DC-brake when the
motor is stopping. The function of the DC-brake depends on the stop function,
parameter 2.1.12.
0 DC-brake is not used
>0 DC-brake is in use and its function depends on the Stop function,
(par. 2.1.12). The DC-braking time is determined with this
parameter.
Par. 2.1.12 = 0 (Stop function = Coasting):
After the stop command, the motor coasts to a stop without control from the drive.
With the DC injection, the motor can be electrically stopped in the shortest possible
time, without using an optional external braking resistor.
The braking time is scaled by the frequency when the DC-braking starts. If the
frequency is greater than the nominal frequency of the motor, the set value of
parameter 2.4.4 determines the braking time. When the frequency is ≤10% of the
nominal, the braking time is 10% of the set value of parameter 2.4.4.
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