HX7+ ASD Installation and Operation Manual 119
DC Injection Braking Start Frequency
Program Protection DC Braking
During deceleration this is the frequency at which DC Injection braking will
start.
DC Injection Braking
DC Injection Braking is a braking system used with three-phase motors.
Unlike conventional brakes, there is no physical contact between the rotating
shaft and a stationary brake pad or drum. When braking is required, the drive
outputs a DC current that is applied to the windings of the motor to quickly
brake the motor. The braking current stops when the time entered in
F252 times
out.
The intensity of the DC current used while braking determines how fast the
motor will come to a stop and may be set at
F251. The intensity setting is
entered as a percentage of the full load current of the ASD.
DC Injection Braking is also used to preheat the motor or to keep the rotor
from spinning freely when the motor is off by providing a pulsating DC current
into the motor at the Carrier Frequency. This feature may be enabled at F254.
Direct Access Number — F250
Parameter Type — Numerical
Factory Default — 0.0
Changeable During Run — Ye s
Minimum — 0.0
Maximum — 120.0
Units — Hz
DC Injection Braking Current
Program Protection DC Braking
This parameter sets the percentage of the rated current of the drive that will be
used for DC Injection braking. A larger load will require a higher setting.
Direct Access Number — F251
Parameter Type — Numerical
Factory Default — 50.00
Changeable During Run — Ye s
Minimum — 0.00
Maximum — 100.0
Units — %
DC Injection Braking Time
Program Protection DC Braking
This parameter is used to set the on-time duration of the DC Injection
Braking.
Direct Access Number — F252
Parameter Type — Numerical
Factory Default — 1.00
Changeable During Run — Ye s
Minimum — 0.00
Maximum — 10.00
Units — Seconds
Motor Shaft Fixing Control
Program Protection DC Braking
This parameter determines if DC Injection braking is to be used during a
change in the direction of the motor.
Settings:
0 — Enabled (box checked)
1 — Disabled
Direct Access Number — F253
Parameter Type — Check Box
Factory Default — Disabled
Changeable During Run — Ye s
F250 F253
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