7 Advanced Settings
7 - 90
High-function General-purpose Inverter RX2 Series User’s Manual
This function is used when a motor does not finish the rotation completely while it is stopping or when
the stop position for the motor is fixed.
To use DC braking for stopping (servo-lock control), set [AA121] Control mode and [AF101] DC braking
selection to 01, [AF102] Braking mode selection to 01 or 02, and [AF106] DC braking time to other than
0.00 second. DC braking will operate after the frequency output has been shut off.
When [AF104] DC braking delay time is set, and if the operation command is turned off and the decel-
erated frequency falls below [AF103] DC braking frequency, the output will be shut off once, and after
[AF104] has elapsed, DC braking will be started.
Precautions for Correct Use
• The carrier frequency during DC braking depends on [bb101], but it is limited to at maximum
5 Hz. Depending on the set braking force, the carrier frequency may automatically go down
to 2 kHz.
• To use the servo-lock control, it is necessary to set [AA121] Control mode. If the applicable
control mode is not selected, the inverter will operate as if [AF102] has been set to 00: DC
braking.
(1)When [AF102] Braking mode selection is set to 01: Speed servo-lock
(2)When [AF102] Braking mode selection is set to 02: Position servo-lock
• The operation to be performed when the operation command is switched from the stop com-
mand to the start command varies depending on the setting of [AF107] DC braking/edge or
level selection.
• When setting [AF106] DC braking time, pay attention to the heat generation on the motor.
• To use the servo-lock control, it is necessary to set [AA121] Control mode. See 7-1 Overview
of Motor Control Methods on page 7-3.
• The output of the servo-lock control is automatically calculated according to the selected con-
trol mode.
7-6-3 DC Braking for Stopping (Servo Lock Control)
No. [AA121] Control mode
1 09: 0Hz-range sensorless vector control
2 10: Vector control with sensor
No. [AA121] Control mode
1 10: Vector control with sensor
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