Toshiba G7 Operation Manual page 107

F241
Run Frequency
Program ⇒ Special Control Parameters ⇒ Frequency Control
This parameter establishes a center frequency (Run Frequency) of a frequency
band .
Parameter F242 provides a plus-or-minus value for the Run Frequency; thus,
establishing a frequency band.
During acceleration, the drive will not output a signal to the motor until the
lower level of the band is reached.
During deceleration, the drive will continue to output the programmed
deceleration output signal to the motor until the lower level of the band is
reached; at which time the output will go to 0.0 Hz.
Run Frequency Hysteresis
Program ⇒ Special Control Parameters ⇒ Frequency Control
This parameter provides a plus-or-minus value for the Run Frequency setting
(F241).
End Frequency
Program ⇒ Special Control Parameters ⇒ Frequency Control
This parameter sets the lowest frequency that the drive will recognize during
deceleration before the drive automatically goes to 0.0 Hz.
DC Injection Braking Start Frequency
Program ⇒ Protection Parameters ⇒ 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 injected into the windings of the motor to quickly
brake the motor. The braking current stops when the time entered in
out.
The amount of DC current used while braking determines how fast the motor
will come to a stop and may be set using F251. The intensity of the DC current
used for DC Injection Braking 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.
G7 ASD Operation Manual
Direct Access Number — F241
Parameter Type — Numerical
Factory Default — 0.0
Changeable During Run — Yes
Minimum — 0.0
Maximum — Max. Freq. (F011)
Units — Hz
Direct Access Number — F242
Parameter Type — Numerical
Factory Default — 0.0
Changeable During Run — Yes
Minimum — 0.0
Maximum — 30.0
Units — Hz
Direct Access Number — F243
Parameter Type — Numerical
Factory Default — 0.0
Changeable During Run — Yes
Minimum — 0.0
Maximum — 30.0
Units — Hz
Direct Access Number — F250
Parameter Type — Numerical
Factory Default — 0.0
Changeable During Run — Yes
Minimum — 0.0
Maximum — 120.0
Units — Hz
F252 times
F250
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