Delta VFD2A8MS21ANSAA User Manual

Chapter 12 Descriptions of Parameter SettingsMS300
381
07 Special Parameters
 You can set this parameter during operation.

07-00
Software Brake Chopper Action Level
Default: 370.0 / 740.0 / 950.0
Settings
115V / 230V models: 350.0–450.0 V
DC
460V models: 700.0–900.0 V
DC
575V models: 875.0–1000.0 V
DC
 Sets the DC bus voltage at which the brake chopper is activated. Choose a suitable brake
resistor to achieve the optimal deceleration performance. Refer to Chapter 7 Optional
Accessories for information about brake resistors.

07-01
DC Brake Current Level
Default: 0
Settings
0–100%
 Sets the level of the DC brake current output to the motor at start-up and stop. When setting the
DC brake current, the rated current (Pr.00-01) is 100%. It is recommended that you start with a
low DC brake current level and then increase until you reach the proper holding torque.
However, the DC brake current cannot exceed the motor’s rated current to prevent the motor
from burnout. Therefore, DO NOT use the DC brake for mechanical retention, otherwise injury or
accident may occur.

07-02
DC Brake Time at Start-up
Default: 0.0
Settings
0.0–60.0 sec.
 The motor may continue rotating due to external forces or the inertia of the motor itself. If you
use the drive with the motor rotating, it may cause motor damage or trigger drive protection due
to over-current. This parameter outputs DC current, generating torque to force the motor stop to
get a stable start before motor operation. This parameter determines the duration of the DC
brake current output to the motor when the drive starts up. Set this parameter to 0.0 to disable
the DC brake at start-up. 

07-03
DC Brake Time at STOP
Default: 0.0
Settings
0.0–60.0 sec.
 The motor may continue rotating after the drive stops output due to external forces or the inertia
of the motor itself. This parameter outputs DC current, generating torque to force the motor stop
after the drive stops output to make sure that the motor stops.
 This parameter determines the duration of the DC Brake current output to the motor when
braking. To enable the DC brake at STOP, you must set Pr.00-22 (Stop Method) to 0 (ramp to
stop). Set this parameter to 0.0 to disable the DC brake at stop.
 Related parameters:
 Pr.00-22 Stop Method
 Pr.07-04 DC Brake Frequency at STOP.

Delta VFD2A8MS21ANSAA Specifications

General

Brand	Delta
Model	VFD2A8MS21ANSAA
Category	DC Drives
Language	English