
Q7 ASD Installation and Operation Manual
57
CPU Version
Program
⇒
Utility Group
⇒
CPU Version
This is a read-only parameter that displays the version level of the CPU.
DC Injection Braking Current
Program
⇒
Protection
⇒
DC Inj Current
This parameter sets the percentage of the rated current of the ASD that will be
used for DC Injection braking. A larger load will require a higher setting.
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 ASD
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 DC
Injection Braking Time 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 the DC Injection Braking
Current parameter. The intensity setting is entered as a percentage of the full
load current of the ASD.
Note: DC Injection Braking is also used to preheat the motor or to
keep the rotor from spinning freely when no rotation is
required by providing a pulsating DC current into the motor
at the Carrier Frequency. This feature may be enabled at the
Motor Shaft Stationary Control parameter.
Parameter Type — Numerical
Factory Default — 50.00
Changeable During Run — Yes
Minimum — 0.00
Maximum — 100.00
Units — %
DC Injection on at Direction Change
Program
⇒
Protection
⇒
DC on Dir Change
This parameter determines if DC Injection braking is to be used during a
change in the direction of the motor.
Parameter Type — Selection List
Factory Default — Disabled
Changeable During Run — Yes
DC Injection Braking Start Frequency
Program
⇒
Protection
⇒
DC Inj Start
During deceleration this is the frequency at which DC Injection braking will
start.
Parameter Type — Numerical
Factory Default — 0.0
Changeable During Run — Yes
Minimum — 0.0
Maximum — 120.0
Units — Hz