Parker AC890PX Series, Engineering Reference

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D-62
A p p e n d i x D : P r o g r a m m i n g
AC890PX AC Drive
INJ BRAKING
SETUP::MOTOR CONTROL::INJ BRAKING
Designed for VOLTS/Hz Motor Control Mode.
The injection braking block provides a method of stopping spinning induction motors without returning the kinetic energy of the motor and load
back in to the dc link of the Drive. This is achieved by running the motor highly inefficiently so that all the energy stored in the load is dissipated in
the motor. Thus, high inertia loads can be stopped without the need for an external dynamic braking resistor.
Parameter Descriptions
DEFLUX TIME PREF: 29.01 Default: 0.5 s Range: 0.1 to 20.0 s
Determines the time in which the Drive defluxes the motor prior injection braking.
FREQUENCY PREF: 29.02 Default: 9.0 Hz Range: 1.0 to 500.0 Hz
Determines the maximum frequency applied to the motor for the low frequency injection braking mode. It is also clamped internally so as never to
exceed 50% of base speed value.
I-LIM LEVEL PREF: 29.03 Default: 100.00 % Range: 50.00 to 150.00 %
Determines the level of motor current flowing during low frequency injection braking.
DC PULSE PREF: 29.04 Default: 2.0 s Range: 0.0 to 100.0 s
Determines the duration of the dc pulse applied to the motor when injection braking is required for motor speeds below 20% of base speed. The
actual dc pulse time applied to the motor is dependent on the ratio of initial motor speed to 20% of base speed.
FINAL DC PULSE PREF: 29.05 Default: 1.0 s Range: 0.0 to 10.0 s
Determines the duration of the final dc holding pulse applied to the motor after either low frequency injection braking or timed dc pulse.
DC LEVEL PREF: 29.06 Default: 3.00 % Range: 0.00 to 25.00 %
Determines the level of dc pulse applied to the motor during either the timed or final dc pulse.