Toshiba ACE-tronics G9 ASD Installation And Operation Manual page 191

F626
Over-Voltage Limit Operation Level
Program  Protection  Stall
This parameter sets the upper DC bus voltage threshold that, once exceeded,
will cause an Over-Voltage Stall. An Over-Voltage Stall increases the output
frequency of the ASD during deceleration for a specified time in an attempt to
prevent an Over-Voltage Trip.
If the over-voltage condition persists for over 4 mS, an Over-Voltage Trip will
be incurred.
This parameter is enabled at F305.
Note: This parameter setting may increase deceleration times.
Under-Voltage Trip
Program  Protection  Under-Voltage/Ridethrough
This parameter Enables/Disables the Under-Voltage Trip function.
With this parameter Enabled, the ASD will trip if the under-voltage condition
persists for a time greater than the
A user-selected contact may be actuated if so configured.
If Disabled the ASD will stop and not trip; the BRAKE contacts are not
affected.
Settings:
Disabled
Enabled
Under-Voltage (Trip Alarm) Detection Time
Program  Protection  Under-Voltage/Ridethrough
This parameter sets the time that the under-voltage condition must exist to
cause an Under-Voltage Trip.
This parameter is enabled at F627.
Regenerative Power Ridethrough Control Level
Program  Protection  Under-Voltage/Ridethrough
This parameter is activated during regeneration. It is used to set the low end of
the DC bus voltage threshold that, once the bus voltage drops below this
setting, activates the setting of
Activation may be the result of a momentary power loss or an excessive load on
the bus voltage.
During a Ridethrough, regenerative energy is used to maintain the control
circuitry settings for the duration of the Ridethrough; it is not used to drive the
motor.
The motor(s) of the system are stopped and then restarted automatically or may
continue seamlessly if so configured.
See F302 for additional information on this parameter.
Note: This parameter setting may increase deceleration times.
ACE-tronics G9 ASD Installation and Operation Manual
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F628 setting.
F302 (Ridethrough Mode).
Direct Access Number — F626
Parameter Type — Numerical
Factory Default — (ASD-Dependent)
Changeable During Run — Yes
Minimum — 100
Maximum — 150
Units — %
Direct Access Number — F627
Parameter Type — Selection List
Factory Default — Enabled
Changeable During Run — No
Direct Access Number — F628
Parameter Type — Numerical
Factory Default — 0.03
Changeable During Run — No
Minimum — 0.01
Maximum — 10.00
Units — Seconds
Direct Access Number — F629
Parameter Type — Numerical
Factory Default — (ASD-Dependent)
Changeable During Run — No
Minimum — 55
Maximum — 100
Units — %
F629
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