Operating Instructions

Descriptions of Parameter Settings
Descriptions of Parameter Settings
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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.
Pr.
Explanation
Settings
Default
07-02
DC brake time at start-up
0.0 to 60.0 sec.
0.0
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.
Pr.
Explanation
Settings
Default
07-03
DC brake time at STOP
0. to 60.0 sec.
0.0
● 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.
Pr.
Explanation
Settings
Default
07-04
DC brake frequency at STOP
0.00 to 599.00 Hz
0.00
Determines the start frequency of the DC brake before the drive ramps to stop. When this setting is less than Pr.01-
09 (Start-up Frequency), the start frequency for the DC brake begins at the minimum frequency.
● Use the DC brake before running the motor when the load is movable at stop, such as with fans and pumps.
The motor is in free running status and in unknown rotation direction before the drive starts up. Execute the DC
brake before you start the motor.
● Use the DC Brake at STOP when you need to brake the motor quickly or to control the positioning, such as with
cranes or cutting machines.