Programming and Parameters 3-31
DYNAMIC CONTROL (File D)
Stop/Brake Modes
158 [DC Brake Level]
Defines the DC brake current level injected
into the motor when “DC Brake” is selected
as a stop mode.
The DC braking voltage used in this
function is created by a PWM algorithm
and may not generate the smooth holding
force needed for some applications. Refer
to the PowerFlex Reference Manual,
publication PFLEX-RM001….
Important: Frame E drives may be limited
to less than 150% depending on the setting
of parameter 151 [PWM Frequency].
Default:
Min/Max:
Units:
[Rated Amps]
0/[Rated Amps] × 1.5
(Equation yields
approximate maximum
value.)
0.1 Amps
159 [DC Brake Time]
Sets the amount of time DC brake current
is “injected” into the motor.
Default:
Min/Max:
Units:
0.0 Secs
0.0/90.0 Secs
0.1 Secs
155
thru
158
160 [Bus Reg Gain]
[Bus Reg Ki]
Sets the responsiveness of the bus
regulator.
Default:
Min/Max:
Units:
450
0/5000
1
161
162
161
162
[Bus Reg Mode A]
[Bus Reg Mode B]
Active bus regulation mode. Choices are
dynamic brake, frequency adjust or both.
Sequence is determined by programmed
value or digital input programmed for “Bus
Reg Md B.”
Dynamic Brake Setup
If a dynamic brake resistor is connected to
the drive, both these parameters must be
set to either option 2, 3 or 4.
Refer to the Attention statement on page
P-4
for important information on bus
regulation.
Default:
Options:
1
4
0
1
2
3
4
“Adjust Freq”
“Both-Frq 1st”
“Disabled”
“Adjust Freq”
“Dynamic Brak”
“Both-DB 1st”
“Both-Frq 1st”
160
163
361
thru
366
File D
Group
No.
Parameter Name and Description
See page 3-2 for symbol descriptions
Values
Related
!
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.
Standard
E C
!
ATTENTION: The drive does not offer protection for externally
mounted brake resistors. A risk of fire exists if external braking
resistors are not protected. External resistor packages must be
self-protected from over temperature or the protective circuit shown
in Figure C.1 on page C-1
(or equivalent) must be supplied.
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