124 H9 ASD Installation and Operation Manual

Run Frequency Hysteresis

Program ⇒ Special ⇒ Frequency Control
This parameter provides a plus-or-minus value for the Run Frequency setting
(F241).
Direct Access Number — F242
Parameter Type — Numeri cal
Factory Default — 0.00
Changeable During Run — Yes
Minimum — 0.00
Maximum — 30.0
Units — Hz

End Frequency

Program ⇒ Special ⇒ Frequency Control
This parameter sets the lowest frequency that the drive will recognize during
deceleration before the drive goes to 0.0 H z.
Direct Access Number — F243
Parameter Type — Numeri cal
Factory Default — 0.00
Changeable During Run — Yes
Minimum — 0.00
Maximum — 30.0
Units — Hz

0 Hz Dead Band Signal

Program ⇒ Special ⇒ Special Parameters
This parameter sets an output fr eq uency threshold that, until th e co mmanded
frequency surpasses this setting, the ASD will output 0 Hz to the motor.
This setting will over ride the Start Frequency setting (F240) if this setting has
a higher value.
Direct Access Number — F244
Parameter Type — Numeri cal
Factory Default — 0.00
Changeable During Run — Yes
Minimum — 0.00
Maximum — 5.00
Units — Hz

DC Injection Braking Start Frequency

Program ⇒ Protection ⇒ DC Braking
During deceleration this is the frequenc y at which DC Injection braking will
start.

DC Injection Braking

DC Injection Braking is a braking system used with thre e -p ha s e 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 — Numeri cal
Factory Default — 0.00
Changeable During Run — Yes
Minimum — 0.00
Maximum — 120.00
Units — Hz

DC Injection Braking Current

Program ⇒ Protection ⇒ DC Braking
This parameter sets th e percentage of the r ated current of the driv e that will be
used for DC Injection braking. A larger load will require a higher setting.
Direct Access Number — F251
Parameter Type — Numeri cal
Factory Default — 50
Changeable During Run — Yes
Minimum — 0
Maximum — 100
Units — %
F242 F251