Toshiba Q9 Installation And Operation Manual page 121

F304
Dynamic Braking (Not Used)
Program  Protection
This parameter Enables/Disables the Dynamic Braking system.
Note: Dynamic Braking is not available on the Q9 ASD.
Settings:
0 — Off
1 — On with Overload Detection
2 — On without Overload Detection
Dynamic Braking
Dynamic Braking is used to prevent over-voltage faults during rapid deceleration
or constant speed run on cyclic overhauling applications.
Dynamic Braking dissipates regenerated energy in the form of heat. When using
a DBR use thermal protection.
The resistive load is connected across terminals PA and PB (non-polarized).
Using a low-value, high-wattage resistance as a load for the generated current, the
resistive load dissipates the induced energy.
Dynamic Braking helps to slow the load quickly; it cannot act as a holding brake.
The Dynamic Braking function may be setup and enabled by connecting a
braking resistor from terminal PA to PB of the drive and providing the proper
information at F304, F308, and F309.
Over-Voltage Stall Enable
Program  Protection
This parameter enables the Over-Voltage Limit function. This feature is used to
set 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 drive during
deceleration for a specified time in an attempt to prevent an Over-Voltage Trip.
If the over-voltage threshold level setting of parameter
than 4 ms, an Over-Voltage Trip will be incurred.
Note: This parameter setting may increase deceleration times.
Note: Over-voltage alarms will display OP to convey Over-Potential.
Settings:
0 — Enabled (Over-Voltage Stall)
1 — Disabled
2 — Enabled (Forced Shorted Deceleration)
3 — Enabled (Forced Dynamic Braking Deceleration — Not Used)
Q9 ASD Installation and Operation Manual
F626 is exceeded for more
Direct Access Number — F304
Parameter Type — Selection List
Factory Default — Off
Changeable During Run — No
Direct Access Number — F305
Parameter Type — Selection List
Factory Default — (ASD-Dependent)
Changeable During Run — Yes
F305
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