A425, A427, Advanced program group – Rockwell Automation 22F PowerFlex 4M User Manual FRN 1.xx - 2.xx User Manual
Page 63: Continued), A425 [dc brake level, A427 [db resistor sel
Programming and Parameters
3-23
PowerFlex 4M Adjustable Frequency Drive FRN 1.xx - 2.xx User Manual
Publication 22F-UM001D-EN-E
Advanced Program Group
(continued)
A425 [DC Brake Level]
Related Parameter(s):
,
Defines the maximum DC brake current, in amps, applied to the motor when
[Stop Mode] is set
to either “Ramp” or “DC Brake”.
Values
Default
Drive Rated Amps
×
0.05
Min/Max:
0.0/(Drive Rated Amps
×
1.8)
Display:
0.1 Amps
DC Injection Braking Mode
V
olts/S
p
eed
Voltage
Time
Stop Command
Speed
[DC Brake Level]
[DC Brake Time]
V
olts/S
p
eed
Ramp-to-Stop Mode
Time
Stop Command
[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.
!
ATTENTION:
This feature should not be used with synchronous or permanent
magnet motors. Motors may be demagnetized during braking.
A427 [DB Resistor Sel]
Related Parameter(s):
Stop drive before changing this parameter.
Enables/disables external dynamic braking. This parameter applies only to Frame C drives.
The drive is able to provide full braking indefinitely. Braking power is limited by the external DB
resistor. When this parameter is set to 1 “Normal RA Res” and an appropriate RA resistor is used (see
selection
), the drive provides calculated resistor overload protection. However, the drive
cannot protect against a brake IGBT failure.
Values
Default
0
Min/Max:
0/3
Display:
1
Setting
Min/Max
0
1
2
3
“Disabled”
“Normal RA Res” (5% Duty Cycle) - Refer to
“No Protection” (100% Duty Cycle)
“% Duty Cycle” Limited (1% – 99% of Duty Cycle) - see
!
ATTENTION:
A risk of fire exists if external braking resistors are not protected. The
external resistor package must be self-protected from over temperature or the protective
circuit shown in
, or equivalent, must be supplied.