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W7 ASD Installation and Operation Manual 65
Cumulative Run-timer Alarm Setting
Program Protection Settings Cumulative Run-timer Alarm
Setting
This parameter sets a run-time value that, once exceeded, provides an output
signal. The output signal may be used to control external equipment or used to
engage a brake.
Note: The time displayed is 1/10th of the actual time
(0.1 hr. = 1.0 hr.).
Parameter Type — Numerical
Factory Default — 175.0
Changeable During Run — Yes
Minimum — 0.1
Maximum — 999.9
Units — Hours (X 100)
DC Injection Braking Current
Program Protection DC Injection 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 Braking Start Frequency
Program Protection Settings DC Injection Start Frequency
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
DC Injection Braking Time
Program Protection Settings DC Injection Time
This parameter is used to set the on-time duration of the DC Injection braking.
Parameter Type — Numerical
Factory Default — 1.00
Changeable During Run — Yes
Minimum — 0.00
Maximum — 10.00
Units — Seconds
Cumulative Run-timer Alarm Setting DC Injection Braking Time