
140
ACE-tronics G9 ASD Installation and Operation Manual
Dynamic Braking Enable
Program
Protection
Dynamic Braking
This parameter Enables/Disables the Dynamic Braking system.
Settings:
Off
Enabled with Overload Detection
Enabled without Overload Detection
Dynamic Braking uses the transistor IGBT7 to dissipate the bus voltage when
required.
IGBT7 is a standard item on the 25 HP and below ACE-tronics G9 ASD 230-
volt systems and is standard on the 400 HP and below for the for the 460-volt
systems. IGBT7 is optional for all remaining systems.
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 ASD and providing the proper
information at
F304
,
F308
, and
F309
.
See the section titled
Dynamic Braking Resistor Specifications on pg. 274
for
additional information on using the DBR system and for assistance in selecting
the appropriate resistor for a given application.
Direct Access Number — F304
Parameter Type — Selection List
Factory Default — Enabled without
Overload Detection
Changeable During Run — No
Over-Voltage Limit Operation
Program
Protection
Stall
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 ASD during
deceleration 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.
Note:
This parameter setting may increase deceleration times.
Settings:
Enabled (Over-Voltage Stall)
Disabled
Enabled (Forced Shorted Deceleration)
Enabled (Forced Dynamic Braking Deceleration)
Direct Access Number — F305
Parameter Type — Selection List
Factory Default — Disabled
Changeable During Run — Yes
F304
F305
Buy: www.ValinOnline.com | Phone 844-385-3099 | Email: [email protected]