Q9 Plus ASD Installation and Operation Manual
137
Dynamic Braking Enable (not used)
Program
Protection
Dynamic Braking
This parameter
Enables/Disables
the
Dynamic Braking
system.
Settings:
0 — Off
1 — On with Trip, ST-Off and Overload Detection
2 — On with Trip and ST-Off
3 — On with Trip and Overload Detection
4 — On with Trip
5 — On with ST-Off and Overload Detection
6 — On with ST-Off
7 — On with Overload Detection
8 — On
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 set up and enabled by connecting a
braking resistor from terminal
PA
to
PB
of the ASD and providing the proper
information at
F304
,
F308
, and
F309
.
Direct Access Number — F304
Parameter Type —
Selection List
Factory Default —
Off
Changeable During Run —
No
Over-Voltage Limit Operation
Program
Protection
Stall
This parameter enables the
Over-Voltage Limit
function. This feature, in
conjunction with the setting of
F626
, is used to set the upper DC bus voltage
threshold that, once exceeded, will cause an
Over-Voltage Stall
.
While running or during deceleration, the
Over-Voltage Stall
function
increases the output frequency of the ASD for a specified time in an attempt to
prevent an
Over-Voltage Trip
.
If the over-voltage threshold level setting of parameter
F626
is exceeded for
over 4 mS, an
Over-Voltage Trip
will be incurred.
The effects of this parameter may be further enhanced by the setting of
F468
.
Note:
This parameter setting may increase deceleration times.
Note:
Over-voltage alarms will display OP to convey Over Potential.
Settings:
0 — On (OP Stall)
1 — Off
2 — On (Quick Deceleration)
3 — On (Dynamic Quick Deceleration — NOT USED)
Direct Access Number — F305
Parameter Type —
Selection List
Factory Default —
ON (Quick
Deceleration)
Changeable During Run —
No
F304
F305
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