Rockwell Automation 150 SMC-Flex User Manual - Manual (Page 138)

B-4 Parameter Information
Basic Set
Up/ Accu-
Stop
Braking Current 35 %FLC 0…400 0
When the Smart Motor Braking option is
installed, this parameter allows the user the
ability to adjust the braking current level
applied to the motor. Smart Motor Braking and
Accu-Stop has the capability to apply braking
current to the motor from the “at speed”
condition. With Smart Motor Braking, the
braking maneuver continues until the motor
comes to rest, at which point the controller
automatically ceases braking action. Note that
high braking currents can introduce excessive
vibration to the motor couplings and/or
gearing and additional heating in the motor.
Linear List
Braking Time
(SMB)
36 ➂ Sec 0…999 0
This parameter provides the ability to over-
ride the SMB function (zero-speed detection)
and set an exact time in which the braking
current is applied to the motor. This can be
used for applications where detecting zero
speed is difficult or when the purpose is to
reduce the number of overload trips
associated with driving the motor to a
complete stop.
Setting this to a specific value will turn off the
braking at a set time, each time a stopping
maneuver is performed. An ideal setting can
be accomplished through trial and error and
should always allow for some small coast
time. Setting this value to long will cause
braking current to be applied to a stopped
motor and likely result in overload trips.
Linear List Load Type (SMB) 37 ➂
0 - Standard
0 - Standard
Allows the user the ability to modify the
braking profile to match a particular load type.
This parameter is designed to only be used
with the SMB algorithm and not with timed
brake. For the majority of applications the
standard profile will work sufficiently.
Adjusting this parameter should really only be
used when some type of problem during
braking is being encountered.
1 - Hi Inertia
2 - Hi Friction
3 - Ramp 89
Linear List
High Eff Brake
(SMB)
38 ➂
% of
Stopping
Time
0…99 0
This parameter is used to extend the SMB
braking time by a percentage of the typical
stopping time. The need to adjust this
parameter can occur when braking is applied
to high efficiency motors and relates to the
counter EMF produced by these motors. This
setting should never really exceed 50%.
Nuisance overload faults will likely occur is
set incorrectly.
Table B.1 Parameter List (Continued)
Group
Parameter
Name
Parameter
Number
Units
Min./
Max.
Default
Settings
Parameter Description
User
Settings
➂ This parameter is not viewable without entering a special password in Firmware versions 4.001 or earlier. Contact Rockwell Automation technical support if you have
Version 4.001 firmware or earlier and need to access this parameter.