100 Rockwell Automation Publication 520-UM001A-EN-E - February 2013
Chapter 3 Programming and Parameters
Advanced Program Group (continued)
A435 [DC Brake Level] Related Parameter(s): P045
Defines the maximum DC brake current, in amps, applied to the motor when P045 [Stop Mode] is set to either 4 “Ramp” or 6 “DC Brake”.
Values Default: Drive Rated Amps x 0.5
Min/Max: 0.0/(Drive Rater Amps x 1.8)
Display: 0.1 A
DC Injection Stop Mode
Volts/Speed
Voltage
Time
Stop Command
Speed
[DC Brake Time]
Volts/Speed
Ramp-to-Stop Mode
Time
Stop Command
Magnitude
depends on
[DC Brake Level]
Magnitude
depends on
[DC Brake Level]
[DC Brake Time]
Voltage
Speed
ATTENTION: If a hazard of injury due to movement of equipment or material exists, an auxiliary mechanical braking device must be used. This feature should
not be used with synchronous motors. Motors may be demagnetized during braking.
A436 [DC Brk Time@Strt] Related Parameter(s): P045, A435
Sets the length of time that DC brake current is “injected” into the motor after a valid start command is received.
Values Default: 0.0 s
Min/Max: 0.0/99.9 s
Display: 0.1 s
Volts/Speed
Time
Start Command
[DC Brake Level]
[DC Brk Time@Strt]
Voltage
Speed
A437 [DB Resistor Sel]
Stop drive before changing this parameter.
Enables/disables external dynamic braking and selects the level of resistor protection.
Options 0 “Disabled” (Default)
1 “Norml RA Res” 5%
2 “NoProtection” 100%
3...99 “3...99% DutyCycle”
A438 [DB Threshold] Related Parameter(s): A437
Sets the DC bus voltage threshold for Dynamic Brake operation. If DC bus voltage rises above this level, Dynamic Brake turns on. Lower values makes the dynamic braking function more
responsive but may result in nuisance Dynamic Brake activation.
Values Default: 100.0%
Min/Max: 10.0/110.0%
Display: 0.1%
ATTENTION: Equipment damage may result if this parameter is set to a value that causes the dynamic braking resistor to dissipate excessive power. Parameter
settings less than 100% should be carefully evaluated to ensure that the Dynamic Brake resistor's wattage rating is not exceeded. In general, values less than
90% are not needed. This parameter's setting is especially important if parameter A437 [DB Resistor Sel] is set to 2 “NoProtection”.
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