Chapter 12 Descriptions of Parameter SettingsMS300
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DC Brake Frequency at STOP
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.
When using speed tracking, adjust Pr.07-05 to slow down the increasing voltage gain if there are
errors such as oL or oc; however, the speed tracking time will be longer.
Restart after Momentary Power Loss
1: Speed tracking by the speed before the power loss
2: Speed tracking by the minimum output frequency
Determines the operation mode when the drive restarts from a momentary power loss.
The power system connected to the drive may power off momentarily for many reasons. This
function allows the drive to keep outputting voltages after the drive is repowered and does not
cause the drive to stop.
1: Frequency tracking begins before momentary power loss and accelerates to the master
Frequency command after the drive output frequency and motor rotator speed are synchronous.
Use this setting when there is a lot of inertia with little resistance on the motor load. For example,
in equipment with a large inertia flywheel, there is NO need to wait until the flywheel stops
completely after a restart to execute the operation command; therefore, it saves time.
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